EP0097487A2 - Procédé pour produire des revêtements résistants à la corrosion sur des objets ferreux - Google Patents

Procédé pour produire des revêtements résistants à la corrosion sur des objets ferreux Download PDF

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Publication number
EP0097487A2
EP0097487A2 EP83303464A EP83303464A EP0097487A2 EP 0097487 A2 EP0097487 A2 EP 0097487A2 EP 83303464 A EP83303464 A EP 83303464A EP 83303464 A EP83303464 A EP 83303464A EP 0097487 A2 EP0097487 A2 EP 0097487A2
Authority
EP
European Patent Office
Prior art keywords
aluminum
bath
coating
corrosion
ferrous
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP83303464A
Other languages
German (de)
English (en)
Other versions
EP0097487A3 (fr
Inventor
Ralph William Leonard
Joseph Donald Swan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
USS Engineers and Consultants Inc
Original Assignee
USS Engineers and Consultants Inc
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.)
Filing date
Publication date
Application filed by USS Engineers and Consultants Inc filed Critical USS Engineers and Consultants Inc
Publication of EP0097487A2 publication Critical patent/EP0097487A2/fr
Publication of EP0097487A3 publication Critical patent/EP0097487A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon

Definitions

  • the present invention relates to the production of corrosion-resistant coatings on ferrous-base articles.
  • Hot-dip coated steel articles having a coating composed principally of various combinations of aluminum and zinc are known to exhibit an optimum combination of general corrosion resistance, more durable than zinc coatings, while providing more galvanic protection to cut edges and areas of mechanical damage than do hot-dip aluminum coatings.
  • a coating bath containing from 25% to 70% aluminum, balance zinc and silicon is shown in United States Patent Specification No. 3,343,930, and a coating bath containing from 12 to 24% zinc, optional amounts of silicon and balance aluminum, is shown in European Patent Application No. 82306407.6.
  • the exposure-drying cycle is repeated and the coating is considered stabilized if it survives 100 cycles of the test procedure without exhibiting corrosion flaking.
  • the initial leaching with nitric acid is deemed so severe, that the correlation of the above tests with actual, realistic environment is somewhat questionable.
  • a less severe test such as ASTM B117-73, the correlatability of which is generally more reliable (although not proven with respect to corrosion flaking)
  • coatings containing about an equal amount of zinc and aluminum do not exhibit corrosion flaking even when slowly cooled and thus not stabilized.
  • flaking tendency appears to increase as the aluminum concentration of the coating increases.
  • coatings containing more than about 72% aluminum will exhibit flaking, in the less drastic ASTM test, irrespective of whether they had been stabilized by the rapid cooling. It was found that the resistance to flaking, as evaluated by ASTM B117-73, can significantly be increased by the addition of small amounts of magnesium to the molten aluminum-zinc alloy bath.
  • a method of producing corrosion-resistant coatings metallurgically bonded to ferrous-base articles which comprises dipping a clean surface of said article into a molten bath consisting essentially of, by weight, 72% to 95% Al, up to 3.5% Fe, up to 4% Si, balance Zn for a period at least sufficient to form an aluminum-zinc coating thereon with an interfacial alloy layer portion having a thickness greater than 0.01 mils, said layer resulting from the reaction of the ferrous surface with the bath, removing the coated surface from said bath and cooling the molten coating adhering thereto, wherein resistance to corrosion flaking of the resulting coating is enhanced by adding 0.04 to 0.32% Mg to said molten bath.
  • Test samples used for evaluation of corrosion flaking were prepared by a procedure similar to that described in United States Patent Specification No. 3,393,089.
  • the steel sheet was cleaned in an aqueous silicate solution, annealed in-line under reducing conditions by heating to a temperature of 1475°F (790°C) and cooled to a temperature slightly above bath temperature prior to entry into the coating bath.
  • the reducing furnace atmosphere was maintained by introducing a hydrogen-nitrogen mixture into a snout just above the bath surface.
  • a baffle was located inside the snout to prevent the incoming cold gases from impinging directly onto the strip.
  • Coating baths were maintained at a temperature of 75 to 100°F (40 to 55°C) above the liquidus temperature for each bath concentration.
  • Air-knives were used to control the thickness of the coating on the strip. For each bath concentration, duplicate runs were employed: (i) in which the average cooling rate over the range of solidification was maintained at 25°F/sec. (14°C/sec.), and (ii) in which said average cooling rate was 15°F/sec. (8°C/sec.) that is, below the critical rate of 20 o F/sec. (11°C/sec.) disclosed in U. S. Patent No. 3,343,930.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
EP83303464A 1982-06-17 1983-06-15 Procédé pour produire des revêtements résistants à la corrosion sur des objets ferreux Withdrawn EP0097487A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US38930582A 1982-06-17 1982-06-17
US389305 1982-06-17

Publications (2)

Publication Number Publication Date
EP0097487A2 true EP0097487A2 (fr) 1984-01-04
EP0097487A3 EP0097487A3 (fr) 1984-09-12

Family

ID=23537706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83303464A Withdrawn EP0097487A3 (fr) 1982-06-17 1983-06-15 Procédé pour produire des revêtements résistants à la corrosion sur des objets ferreux

Country Status (4)

Country Link
EP (1) EP0097487A3 (fr)
JP (1) JPS5920457A (fr)
AU (1) AU1585983A (fr)
BR (1) BR8303201A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184478A4 (fr) * 1999-03-19 2007-12-05 Nippon Steel Corp Produit en acier traite en surface, prepare par placage a base d'etain ou d'aluminium
CN112639154A (zh) * 2018-08-30 2021-04-09 Posco公司 热成型性和耐蚀性优异的铝-锌合金镀覆钢板及其制造方法
CN114293038A (zh) * 2021-12-27 2022-04-08 江苏中矿大正表面工程技术有限公司 一种耐腐蚀含铈Zn-Cu-Ti涂层的制备方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB736224A (en) * 1952-09-26 1955-09-07 Reynolds Metals Co Improvements in or relating to aluminum alloy coated steel
US3058206A (en) * 1956-12-27 1962-10-16 Gen Electric Aluminum coating of ferrous metal and resulting product
US3180716A (en) * 1958-05-26 1965-04-27 Kaiser Aluminium Chem Corp Aluminum coated ferrous material
US3055771A (en) * 1958-05-26 1962-09-25 Kaiser Aluminium Chem Corp Method of coating a ferrous base with aluminum
FR1393962A (fr) * 1961-04-13 1965-04-02 Pompey Acieries Procédé de préparation de pièces métalliques en vue de leur mise en forme par filage ou par des procédés du même genre, et articles finis ou semi-finis ainsi obtenus
US3480465A (en) * 1966-03-30 1969-11-25 Shichiro Ohshima Method of chemically bonding aluminum or aluminum alloys to ferrous alloys
SE346809B (fr) * 1967-10-25 1972-07-17 Olin Corp
DE1771125A1 (de) * 1968-04-05 1971-12-16 Kernforschung Gmbh Ges Fuer Verfahren zur Herstellung von korrisionsgeschuetzen Huellrohren fuer Kernbrennstoffe
EP0037143B1 (fr) * 1980-03-25 1985-03-20 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Procédé de revêtement à chaud

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184478A4 (fr) * 1999-03-19 2007-12-05 Nippon Steel Corp Produit en acier traite en surface, prepare par placage a base d'etain ou d'aluminium
CN112639154A (zh) * 2018-08-30 2021-04-09 Posco公司 热成型性和耐蚀性优异的铝-锌合金镀覆钢板及其制造方法
US12241161B2 (en) 2018-08-30 2025-03-04 Posco Co., Ltd Aluminum-zinc alloy plated steel sheet having excellent hot workability and corrosion resistance, and method for manufacturing same
CN114293038A (zh) * 2021-12-27 2022-04-08 江苏中矿大正表面工程技术有限公司 一种耐腐蚀含铈Zn-Cu-Ti涂层的制备方法
CN114293038B (zh) * 2021-12-27 2022-08-09 江苏中矿大正表面工程技术有限公司 一种耐腐蚀含铈Zn-Cu-Ti涂层的制备方法

Also Published As

Publication number Publication date
BR8303201A (pt) 1984-01-31
EP0097487A3 (fr) 1984-09-12
AU1585983A (en) 1983-12-22
JPS5920457A (ja) 1984-02-02

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Inventor name: SWAN, JOSEPH DONALD

Inventor name: LEONARD, RALPH WILLIAM