SE523949C2 - Förfarande vid korrosionsskydd av särskilt korrosionsutsatta delar i bergborrutrustning - Google Patents

Förfarande vid korrosionsskydd av särskilt korrosionsutsatta delar i bergborrutrustning

Info

Publication number: SE523949C2
Authority: SE; Sweden
Prior art keywords: corrosion; zinc; manganese; exposed parts; procedure
Prior art date: 2002-03-20

Application number

SE0200874A

Other languages

English (en)

Swedish (sv)

Other versions

SE0200874D0 (sv

SE0200874L (sv

Inventor

Goeran Stenberg

Original Assignee

Atlas Copco Secoroc Ab

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

2002-03-20

Filing date

2002-03-20

Publication date

2004-06-08

Family has litigation

First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20287354&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=SE523949(C2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

2002-03-20 Application filed by Atlas Copco Secoroc Ab filed Critical Atlas Copco Secoroc Ab

2002-03-20 Priority to SE0200874A priority Critical patent/SE523949C2/sv

2002-03-20 Publication of SE0200874D0 publication Critical patent/SE0200874D0/xx

2003-03-14 Priority to EP03708793A priority patent/EP1488072B1/de

2003-03-14 Priority to DE60306908T priority patent/DE60306908T2/de

2003-03-14 Priority to PL03371660A priority patent/PL371660A1/xx

2003-03-14 Priority to CA002479431A priority patent/CA2479431A1/en

2003-03-14 Priority to AT03708793T priority patent/ATE333564T1/de

2003-03-14 Priority to US10/508,053 priority patent/US20050208224A1/en

2003-03-14 Priority to AU2003212764A priority patent/AU2003212764B2/en

2003-03-14 Priority to PCT/SE2003/000432 priority patent/WO2003078788A1/en

2003-09-21 Publication of SE0200874L publication Critical patent/SE0200874L/xx

2004-06-08 Publication of SE523949C2 publication Critical patent/SE523949C2/sv

2004-09-16 Priority to ZA200407464A priority patent/ZA200407464B/en

Links

238000005260 corrosion Methods 0.000 title claims abstract description 14
230000007797 corrosion Effects 0.000 title claims abstract description 14
238000000034 method Methods 0.000 title claims abstract description 11
238000005553 drilling Methods 0.000 title abstract description 13
239000011435 rock Substances 0.000 title abstract description 4
WJZHMLNIAZSFDO-UHFFFAOYSA-N manganese zinc Chemical compound [Mn].[Zn] WJZHMLNIAZSFDO-UHFFFAOYSA-N 0.000 claims abstract description 6
HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 5
238000004018 waxing Methods 0.000 claims abstract description 5
229910052725 zinc Inorganic materials 0.000 claims abstract description 5
239000011701 zinc Substances 0.000 claims abstract description 5
PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 3
229910052748 manganese Inorganic materials 0.000 claims abstract description 3
239000011572 manganese Substances 0.000 claims abstract description 3
238000000576 coating method Methods 0.000 claims description 7
NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
239000011248 coating agent Substances 0.000 claims description 6
229910019142 PO4 Inorganic materials 0.000 claims description 5
229910001437 manganese ion Inorganic materials 0.000 claims description 5
NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 5
239000010452 phosphate Substances 0.000 claims description 5
229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims 2
238000011010 flushing procedure Methods 0.000 description 6
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
238000007747 plating Methods 0.000 description 2
VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
229910000760 Hardened steel Inorganic materials 0.000 description 1
238000007598 dipping method Methods 0.000 description 1
229910052759 nickel Inorganic materials 0.000 description 1
238000010422 painting Methods 0.000 description 1
238000007789 sealing Methods 0.000 description 1

Classifications

- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/12—Orthophosphates containing zinc cations
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/18—Orthophosphates containing manganese cations
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/18—Orthophosphates containing manganese cations
- C23C22/182—Orthophosphates containing manganese cations containing also zinc cations
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/03—Couplings; joints between drilling rod or pipe and drill motor or surface drive, e.g. between drilling rod and hammer
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B6/00—Drives for drilling with combined rotary and percussive action

Landscapes

Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Geology (AREA)
Mining & Mineral Resources (AREA)
Life Sciences & Earth Sciences (AREA)
General Chemical & Material Sciences (AREA)
Chemical Kinetics & Catalysis (AREA)
Materials Engineering (AREA)
Metallurgy (AREA)
Organic Chemistry (AREA)
Environmental & Geological Engineering (AREA)
Fluid Mechanics (AREA)
Physics & Mathematics (AREA)
General Life Sciences & Earth Sciences (AREA)
Geochemistry & Mineralogy (AREA)
Preventing Corrosion Or Incrustation Of Metals (AREA)
Earth Drilling (AREA)
Application Of Or Painting With Fluid Materials (AREA)
Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Lubricants (AREA)

SE0200874A 2002-03-20 2002-03-20 Förfarande vid korrosionsskydd av särskilt korrosionsutsatta delar i bergborrutrustning SE523949C2 (sv)

Priority Applications (10)

Application Number	Priority Date	Filing Date	Title
SE0200874A SE523949C2 (sv)	2002-03-20	2002-03-20	Förfarande vid korrosionsskydd av särskilt korrosionsutsatta delar i bergborrutrustning
PCT/SE2003/000432 WO2003078788A1 (en)	2002-03-20	2003-03-14	A method for applying an anti-corrosion coating to especially corrosion exposed parts in rock drill equipment
AU2003212764A AU2003212764B2 (en)	2002-03-20	2003-03-14	A method for applying an anti-corrosion coating to especially corrosion exposed parts in rock drill equipment
PL03371660A PL371660A1 (en)	2002-03-20	2003-03-14	A method for applying an anti-corrosion coating to especially corrosion exposed parts in rock drill equipment
DE60306908T DE60306908T2 (de)	2002-03-20	2003-03-14	Verfahren zum aufbringen eines korrosionsschutzüberzugs auf teile in gesteinsbohrausrüstung, die besonders korrosion ausgesetzt sind
EP03708793A EP1488072B1 (de)	2002-03-20	2003-03-14	Verfahren zum aufbringen eines korrosionsschutzüberzugs auf teile in gesteinsbohrausrüstung, die besonders korrosion ausgesetzt sind
CA002479431A CA2479431A1 (en)	2002-03-20	2003-03-14	A method for applying an anti-corrosion coating to especially corrosion exposed parts in rock drill equipment
AT03708793T ATE333564T1 (de)	2002-03-20	2003-03-14	Verfahren zum aufbringen eines korrosionsschutzüberzugs auf teile in gesteinsbohrausrüstung, die besonders korrosion ausgesetzt sind
US10/508,053 US20050208224A1 (en)	2002-03-20	2003-03-14	Method for applying an anti-corrosion coating to especially corrosion exposed parts in rock drill equipment
ZA200407464A ZA200407464B (en)	2002-03-20	2004-09-16	A method for applying an anti-corrosion coating toespecially corrosion exposed parts in rock drill equipment.

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
SE0200874A SE523949C2 (sv)	2002-03-20	2002-03-20	Förfarande vid korrosionsskydd av särskilt korrosionsutsatta delar i bergborrutrustning

Publications (3)

Publication Number	Publication Date
SE0200874D0 SE0200874D0 (sv)	2002-03-20
SE0200874L SE0200874L (sv)	2003-09-21
SE523949C2 true SE523949C2 (sv)	2004-06-08

Family

ID=20287354

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
SE0200874A SE523949C2 (sv)	2002-03-20	2002-03-20	Förfarande vid korrosionsskydd av särskilt korrosionsutsatta delar i bergborrutrustning

Country Status (10)

Country	Link
US (1)	US20050208224A1 (de)
EP (1)	EP1488072B1 (de)
AT (1)	ATE333564T1 (de)
AU (1)	AU2003212764B2 (de)
CA (1)	CA2479431A1 (de)
DE (1)	DE60306908T2 (de)
PL (1)	PL371660A1 (de)
SE (1)	SE523949C2 (de)
WO (1)	WO2003078788A1 (de)
ZA (1)	ZA200407464B (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2929322B1 (fr) *	2008-03-25	2010-03-12	Montabert Roger	Marteau perforateur hydraulique roto-percutant
SE534770C2 (sv)	2010-01-11	2011-12-13	Atlas Copco Rock Drills Ab	Slående bergborrmaskin innefattande en frontdel med ett spolhus
SE535183C2 (sv)	2010-09-09	2012-05-15	Atlas Copco Secoroc Ab	Korrosionsskyddad nackadapter för en bergborrmaskin, förfarande samt bergborrmaskin innefattande korrosionsskyddad nackadepter
SE536725C2 (sv) *	2012-01-19	2014-06-24	Atlas Copco Rock Drills Ab	Anordning för spolvätsketätning vid en bergborrmaskin, förfarande för framställning, spolhus och bergborrmaskin
EP2851502B1 (de) *	2013-09-23	2015-11-18	Sandvik Intellectual Property AB	Schaftadapter mit bruchfestem Spülloch
PL2944756T3 (pl) *	2014-05-13	2017-09-29	Sandvik Intellectual Property Ab	Adapter uchwytu ze wzmocnionym otworem płuczącym
EP3101217B1 (de) *	2015-06-04	2018-04-04	Sandvik Intellectual Property AB	Schaftadapter mit verstärktem spülloch
EP4047175B1 (de) *	2021-02-19	2024-07-31	Sandvik Mining and Construction Oy	Schaftadapter, gesteinsbohrmaschine und verfahren
CN117403218A (zh) *	2023-10-13	2024-01-16	北京金兆博高强度紧固件有限公司	一种高强度螺栓表面磷化工艺

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2875110A (en) *	1953-06-29	1959-02-24	Sandvikens Jerwerks Aktiebolag	Corrosion resistant treatment for hollow drill rods
US3364081A (en) *	1965-01-15	1968-01-16	Lubrizol Corp	Aqueous phosphating solutions
US3801503A (en) *	1970-07-24	1974-04-02	Chevron Res	Pneumatic tool lubricant
GB1421386A (en) *	1973-09-19	1976-01-14	Pyrene Chemical Services Ltd	Coating compostions
GB9207725D0 (en) *	1992-04-08	1992-05-27	Brent Chemicals Int	Phosphating solution for metal substrates
US5385655A (en) *	1992-10-30	1995-01-31	Man-Gill Chemical Company	Treatment of metal parts to provide rust-inhibiting coatings
SE515194C2 (sv) *	2000-03-02	2001-06-25	Sandvik Ab	Gängförband och bergborrelementför slående borrning

2002
- 2002-03-20 SE SE0200874A patent/SE523949C2/sv not_active IP Right Cessation
2003
- 2003-03-14 CA CA002479431A patent/CA2479431A1/en not_active Abandoned
- 2003-03-14 US US10/508,053 patent/US20050208224A1/en not_active Abandoned
- 2003-03-14 PL PL03371660A patent/PL371660A1/xx not_active IP Right Cessation
- 2003-03-14 DE DE60306908T patent/DE60306908T2/de not_active Expired - Fee Related
- 2003-03-14 AU AU2003212764A patent/AU2003212764B2/en not_active Ceased
- 2003-03-14 AT AT03708793T patent/ATE333564T1/de not_active IP Right Cessation
- 2003-03-14 WO PCT/SE2003/000432 patent/WO2003078788A1/en not_active Ceased
- 2003-03-14 EP EP03708793A patent/EP1488072B1/de not_active Expired - Lifetime
2004
- 2004-09-16 ZA ZA200407464A patent/ZA200407464B/en unknown

Also Published As

Publication number	Publication date
EP1488072B1 (de)	2006-07-19
US20050208224A1 (en)	2005-09-22
AU2003212764A1 (en)	2003-09-29
WO2003078788A1 (en)	2003-09-25
DE60306908D1 (de)	2006-08-31
ZA200407464B (en)	2005-10-05
SE0200874D0 (sv)	2002-03-20
AU2003212764B2 (en)	2008-03-06
PL371660A1 (en)	2005-06-27
SE0200874L (sv)	2003-09-21
ATE333564T1 (de)	2006-08-15
DE60306908T2 (de)	2007-03-01
EP1488072A1 (de)	2004-12-22
CA2479431A1 (en)	2003-09-25

Legal Events

Date	Code	Title	Description
2011-11-01	NUG	Patent has lapsed

Publication	Publication Date	Title
SE523949C2 (sv)	2004-06-08	Förfarande vid korrosionsskydd av särskilt korrosionsutsatta delar i bergborrutrustning
CA2397155A1 (en)	2001-09-07	Thread joint and rock drill element
EP1319801B1 (de)	2006-05-17	Meisselhalterwechselsystem mit Spannschrauben
MXPA02008332A (es)	2003-02-12	Junta roscada y elemento para perforar roca.
EA007406B1 (ru)	2006-10-27	Труба с резьбой с обработкой поверхности
BR102017019549A2 (pt)	2018-05-02	Método de disposição de um sistema resistente à corrosão a um substrato, sistema inibidor de corrosão disposto em um substrato, e, solução de revestimento de conversão química
RU2521257C1 (ru)	2014-06-27	Приспособление бурильной машины и бурильная машина
BRPI0516799A (pt)	2008-09-23	ferramentas para uso em um canal de petróleo
JP2007517987A (ja)	2007-07-05	クロム酸塩を含まない耐腐食性コーティング
US9212555B2 (en)	2015-12-15	Method for removing the coating from a gas turbine component
WO1999013125A1 (en)	1999-03-18	A device, a drill member and a method for masking the member at thermo chemical surface treatment
US20090021008A1 (en)	2009-01-22	Drill pipe with tool joints
US20200378195A1 (en)	2020-12-03	Wear Resistant Insert
SE525431C2 (sv)	2005-02-22	Handel för slående borrning
KR20200023862A (ko)	2020-03-06	용접방법
JPH04124288A (ja)	1992-04-24	犠牲鉄陽極の発錆防止方法
JPH0228514B2 (ja)	1990-06-25	Taikyuseioyobifusetsuseinosuguretatenshonregupuratsutofuoomukyakukan