JPS62192585A - Surface-treatment of metal - Google Patents
Surface-treatment of metalInfo
- Publication number
- JPS62192585A JPS62192585A JP3257886A JP3257886A JPS62192585A JP S62192585 A JPS62192585 A JP S62192585A JP 3257886 A JP3257886 A JP 3257886A JP 3257886 A JP3257886 A JP 3257886A JP S62192585 A JPS62192585 A JP S62192585A
- Authority
- JP
- Japan
- Prior art keywords
- treatment
- baking
- metal
- steel parts
- galvanizing
- 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.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 15
- 239000002184 metal Substances 0.000 title claims abstract description 15
- 238000004381 surface treatment Methods 0.000 title claims description 6
- 238000011282 treatment Methods 0.000 claims abstract description 35
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000003973 paint Substances 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims 1
- 238000005246 galvanizing Methods 0.000 abstract description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 10
- 239000001257 hydrogen Substances 0.000 abstract description 10
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 238000007796 conventional method Methods 0.000 abstract description 4
- 238000004532 chromating Methods 0.000 abstract description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 abstract 1
- 239000008397 galvanized steel Substances 0.000 abstract 1
- 238000007747 plating Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000011536 re-plating Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Landscapes
- Other Surface Treatments For Metallic Materials (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、金属、特に鉄鋼部品、例えばボルト・ナツト
その他のねじ類の亜鉛めっきにおける耐蝕性の向上及び
水素ぜい性除去を目的とした表面処理方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to surface treatment for improving corrosion resistance and removing hydrogen embrittlement in galvanizing metal, particularly steel parts, such as bolts, nuts, and other screws. It is about the method.
従来の技術
鉄鋼部品の防食処理としては、防錆効果が太きく、かつ
安価である亜鉛めっきが最も一般的であるが、亜鉛めっ
きの白色腐蝕（塩基性炭酸亜鉛）の発生を防いで耐蝕性
を向上させると共に、亜鉛めっきの外観を美しくするた
めに、亜鉛めっきではクロメート処理することが常識と
なっている。Conventional technology The most common anti-corrosion treatment for steel parts is zinc plating, which has a strong rust-preventing effect and is inexpensive. In order to improve the appearance of zinc plating and improve its appearance, it is common practice to treat zinc plating with chromate.
一方、めっきには必ず水素の発生を伴い、水素ぜい性を
起こすという問題がある。すなわち、めっき処理で発生
した水素原子が金属の結晶格子の中に侵入して水素分子
（水素ガス）となり、金属をもろくしたり、金属の巣の
部分に集ってその部分の圧力を高めついに金属に亀裂を
生じさせる。On the other hand, plating always involves the generation of hydrogen, which causes hydrogen brittleness. In other words, hydrogen atoms generated during the plating process enter the metal's crystal lattice and become hydrogen molecules (hydrogen gas), which can make the metal brittle or collect in the metal cavity, increasing the pressure in that area. Causes metal to crack.
このような水素ぜい性を除去するために、めっきしたの
ち、直らに約２００’Ｃの加熱状態において数時間維持
し、金属に侵入した水素を金属の外へ追いだす熱処理、
すなわらベーキング処理が行なわれている。In order to remove such hydrogen embrittlement, a heat treatment is carried out in which the hydrogen that has entered the metal is forced out of the metal by maintaining it in a heated state of about 200'C for several hours immediately after plating.
In other words, a baking process is being performed.
ところで、上）本のように、亜鉛めっきした後、耐蝕性
及び美観を向上させる目的でクロメート処理を行ない、
水素ぜい性を除去する目的でベーキング処理を行なう場
合、クロメート処理によるりロメート被膜が熱に弱く、
連続して１３０’Ｃ以上の温度にざらされると変質して
耐蝕性を失うため、ベーキング処理を先に行ない、亜鉛
めつき→ベーキング処理→クロメート処理の工程順序で
行なわれている。By the way, as shown in the above book, after galvanizing, chromate treatment is performed for the purpose of improving corrosion resistance and aesthetics.
When baking is performed for the purpose of removing hydrogen embrittlement, the chromate coating due to chromate treatment is sensitive to heat.
Continuous exposure to temperatures of 130'C or higher causes deterioration and loss of corrosion resistance, so baking is performed first, followed by galvanizing, baking, and chromating.
発明が解決しようとする問題点
しかし、上記従来の工程は、次に述べるように多くの問
題があった。Problems to be Solved by the Invention However, the above conventional process has many problems as described below.
第２図は上記従来方法の工程を示している。図示した各
処理の前後には水洗又は湯洗が行なわれるが、水洗及び
湯洗はめつき処理において常套手段であるから省略され
ている。FIG. 2 shows the steps of the above conventional method. Although water washing or hot water washing is performed before and after each of the illustrated treatments, this is omitted because it is a common method in water washing and hot water plating processing.
而して、第２図に示すように、亜鉛めっきとクロメート
処理との中間にベーキング処理を行なうと、製品完成ま
でに長時間を要するという問題がある。具体的に説明す
ると、亜鉛めっきに約２時間かかり、ベーキング処理で
は、まず製品をベーキング炉内に入れて２００℃に加熱
するまでに約２時間かかり、その状態で約４時間維持す
る必要がある。しかも、ベーキング炉から出した時の製
品温度は２００℃に達しているので、次のクロメート処
理が可能になる温度まで下げるのに約６時間かかる。更
に、クロメート処理の前処理としてアルカリ洗浄及び硝
酸洗いが必要である。したがって、ベーキング処理のた
めに工程時間が約１２時間も余分にかかり、作業能率の
著しい低下を招くことになる。However, as shown in FIG. 2, if baking treatment is performed between galvanizing and chromate treatment, there is a problem in that it takes a long time to complete the product. Specifically, galvanizing takes about 2 hours, and the baking process requires about 2 hours to first put the product in a baking oven and heat it to 200℃, and then maintain it in that state for about 4 hours. . Moreover, since the temperature of the product reaches 200° C. when it is taken out of the baking oven, it takes about 6 hours to lower the temperature to the point where the next chromate treatment is possible. Furthermore, alkaline cleaning and nitric acid cleaning are required as pre-treatments for chromate treatment. Therefore, the baking process takes an additional 12 hours, resulting in a significant decrease in work efficiency.
また、ベーキング処理を完全に行なうには、亜鉛めっき
仕上り後、３０分〜１時間以内には製品をベーキング炉
内に入れなければならないが、通常のめつき加工業者で
は、作業工程の段取り上、完璧を期することは困難であ
る。In addition, in order to complete the baking process, the product must be placed in the baking oven within 30 minutes to 1 hour after finishing the galvanizing process. It is difficult to aim for perfection.
更に、ベーキング処理工程を中間に入れることによって
、亜鉛めっきの後と、クロメート処理の後に遠心分離機
による乾燥工程が必要となる。このように２回も遠心分
離機にかけると、製品の打痕きずが多くなり、製品不良
を生じ易い。Furthermore, by adding an intermediate baking step, a drying step using a centrifuge is required after galvanizing and after chromating. If the product is centrifuged twice in this way, the product will have many dents and scratches, which is likely to result in product defects.
更にまた、ベーキング処理後の亜鉛めっきの表面はクロ
メート処理の仕上りが悪くて、再めっきしなければなら
ないことがしばしばある。しかし再めっきすると、製品
強度を保持するためにしたベーキング処理の意味が無く
なる。何故ならば、再めっきすると、再び水素ぜい性が
発生するからである。Furthermore, galvanized surfaces after baking often have a poor chromate finish and must be replated. However, once the product is replated, the baking treatment used to maintain the strength of the product becomes meaningless. This is because hydrogen brittleness occurs again when replating.
このようにベーキング処理を中間工程に入れると、作業
時間が長くなるばかりではなく、余分な工程と多大な労
力を必要として、大幅なコストアップになる。Including the baking treatment as an intermediate process not only increases the working time but also requires an extra process and a great deal of labor, resulting in a significant increase in costs.
そこで、本発明者は、上述したクロメート処理とベーキ
ング処理の工程順序を逆にして、亜鉛めっき→クロメー
ト処理→ベーキング処理の工程とすることにより、上述
した従来の問題点を解決できないかと考え、特にベーキ
ング処理における加熱でクロメート被膜が変質するのを
防止するという観点から、種々の実験研究を行なった結
果、クロメート被膜にアルミニウムを含んだ耐熱塗料を
塗布すると、ベーキング処理における加熱でクロメート
被膜が侵されることがなく、しかもベーキング処理の効
果は全く変わらないことを知見した。Therefore, the present inventor thought that it would be possible to solve the above-mentioned conventional problems by reversing the process order of the above-mentioned chromate treatment and baking treatment, and making the steps zinc plating → chromate treatment → baking treatment. From the perspective of preventing the chromate film from deteriorating due to heating during baking treatment, we have conducted various experimental studies and found that when a heat-resistant paint containing aluminum is applied to the chromate film, the chromate film is eroded by the heating during baking treatment. It was found that there was no difference in the effect of baking treatment.
本発明は上記知見に基づいてなされたものである。The present invention has been made based on the above findings.
問題点を解決するための手段
すなわち、本発明による金属の表面処理方法は、鉄素地
に亜鉛めっきを施したのち、クロメート処理を行ない、
そのクロメート被膜にアルミニウムを含む耐熱塗料を塗
布する耐熱塗膜処理を行ない、続いてベーキング処理を
行なうことを特徴とする。A means for solving the problem, that is, a metal surface treatment method according to the present invention, is to apply zinc plating to an iron base and then perform chromate treatment,
The chromate film is characterized by a heat-resistant coating treatment in which a heat-resistant paint containing aluminum is applied, followed by a baking treatment.
実施例 以下、本発明の実施例を図面に基づいて説明する。Example Embodiments of the present invention will be described below based on the drawings.
第１図は本発明方法による工程図を示している。FIG. 1 shows a process diagram according to the method of the present invention.
亜鉛めっき工程は従来と同じであるが、亜鉛めっきの仕
上り後、水洗して直ちにクロメート処理を行なう。続い
て遠心分離機で脱水乾燥した後、クロメート被膜の表面
にアルミニウムを含んだ耐熱塗料を塗布する耐熱塗膜処
理を行なう。The galvanizing process is the same as the conventional one, but after finishing the galvanizing, it is washed with water and immediately subjected to chromate treatment. After dehydration and drying in a centrifugal separator, the surface of the chromate film is subjected to a heat-resistant coating treatment in which a heat-resistant paint containing aluminum is applied.
耐熱塗料は、別表に示すような組成分からなり、アルミ
ニウムを重量比で約３６％含んでいる点に特徴が必る。The heat-resistant paint has the composition shown in the attached table, and is characterized by containing approximately 36% aluminum by weight.
アルミニウムの含有母は、種々の実験の結果、重量比で
３０〜４０％の範囲が好ましいことが判明した。As a result of various experiments, it has been found that the aluminum content is preferably in the range of 30 to 40% by weight.
カロエされる金属部品は上記耐熱塗料の浴に浸漬したの
ち、振り切って塗膜の厚みを均一にする。The metal parts to be caroled are immersed in a bath of the heat-resistant paint and then shaken off to make the thickness of the paint film uniform.
しかるのち、ベーキング炉に入れて塗膜を加熱乾燥さぼ
ると共に、約２００’Ｃの加熱状態で約４時間維持して
、ベーキング・処理を行なう。ベーキング処理の後、自
然冷却を侍って製品が完成する。Thereafter, the coated film is placed in a baking oven to be heated and dried, and the heated state is maintained at about 200'C for about 4 hours for baking and treatment. After the baking process, the product is completed after natural cooling.
而して、上記した亜鉛めっきの仕上り後、クロメート処
理に続く耐熱塗膜処理を経てベーキング処理までに要す
る加工処理時間は約５時間で：第２図に示した従来方法
によるベーキング処理からクロメート処理までに要する
加工処理時間約１２時間に比べて、大巾に短縮された。After finishing the zinc plating described above, the processing time required from chromate treatment to heat-resistant coating treatment to baking treatment is about 5 hours: From baking treatment to chromate treatment using the conventional method shown in Figure 2. Compared to the approximately 12 hours required for processing, this time has been significantly shortened.
以下余白
別表
耐熱塗料の成分表
鉄（Ｆｅ２０）として） ３．０％アルミ
ニ「クム（Ａｌ２Ｏ，とじて）３６．０％亜１ｆ（Ｚｎ
Ｑとして） 、１．０％シリコーン樹
脂 ３４．０％アルキッド樹脂
１６．０％芳香族炭化水素系溶剤
３．０％エステル系溶剤
５．０％添加剤
２．０％発明の詳細
な説明したように、本発明方法は、亜鉛めっきの仕上り
後、先ずクロメート処理を行ない、そのクロメート被膜
にアルミニウムを含む耐熱塗料を塗布する耐熱塗膜処理
を施し、この耐熱塗膜の加熱乾燥とベーキング処理の加
熱を兼ねるようにしたから、加工処理時間が大巾に短縮
できる。しかも、クロメート被膜は耐熱塗膜によって保
護されているので、ベーキング処理の加熱によって耐蝕
性を失うことがない。Below is a separate table of margins showing the ingredients of heat-resistant paint.
Q), 1.0% silicone resin 34.0% alkyd resin
16.0% aromatic hydrocarbon solvent
3.0% ester solvent
5.0% additive
2.0% As explained in detail, the method of the present invention involves first performing a chromate treatment after finishing galvanizing, and applying a heat-resistant paint film treatment containing aluminum to the chromate film. Since the heat-drying of the heat-resistant coating film and the heating of the baking process are both performed, the processing time can be greatly shortened. Moreover, since the chromate film is protected by the heat-resistant coating, it does not lose its corrosion resistance due to the heat of the baking process.
更に、本発明によれば、遠心分離機による脱水乾燥はク
ロメート処理の後に１回だけで良いから、製品の打痕き
ずが少なく、また、クロメート処理において水洗及び湯
洗を必要としないので、全体として多くの手間が省け、
加工時間の短縮と相俟って、加工コストを大巾に低減で
きる効果がおる。Furthermore, according to the present invention, dehydration and drying using a centrifugal separator only needs to be carried out once after chromate treatment, so there are fewer dents and scratches on the product, and since chromate treatment does not require washing with water or hot water, the overall It saves a lot of effort as
Combined with the reduction in machining time, this has the effect of significantly reducing machining costs.
第１図は本発明に係る金属の表面処理方法の工程図、第
２図は従来方法の工程図である。
特許出願人 有限会社 星 光 技 研第２図FIG. 1 is a process diagram of a metal surface treatment method according to the present invention, and FIG. 2 is a process diagram of a conventional method. Patent applicant Hoshiko Giken Ltd. Figure 2
Claims (2)
理を行ない、そのクロメート被膜にアルミニウムを含む
耐熱塗料を塗布する耐熱塗膜処理を行ない、続いてベー
キング処理を行なう金属の表面処理方法。(1) A metal surface treatment method in which an iron base is galvanized, then chromate treated, a heat-resistant paint film containing aluminum is applied to the chromate film, and then a baking treatment is performed.
ウムを含んでいることを特徴とする特許請求の範囲第１
項記載の金属の表面処理方法。(2) Claim 1, wherein the heat-resistant paint contains 30 to 40% aluminum by weight.
The method for surface treatment of metals described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3257886A JPS62192585A (en) | 1986-02-17 | 1986-02-17 | Surface-treatment of metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3257886A JPS62192585A (en) | 1986-02-17 | 1986-02-17 | Surface-treatment of metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62192585A true JPS62192585A (en) | 1987-08-24 |
| JPS6411117B2 JPS6411117B2 (en) | 1989-02-23 |
Family
ID=12362758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3257886A Granted JPS62192585A (en) | 1986-02-17 | 1986-02-17 | Surface-treatment of metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62192585A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230295825A1 (en) * | 2020-07-24 | 2023-09-21 | Phoenix Contact Gmbh & Co. Kg Intellectual Property Licenses & Standards | Method for producing a zinc coating optimized for coefficient of friction on a steel component |
-
1986
- 1986-02-17 JP JP3257886A patent/JPS62192585A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230295825A1 (en) * | 2020-07-24 | 2023-09-21 | Phoenix Contact Gmbh & Co. Kg Intellectual Property Licenses & Standards | Method for producing a zinc coating optimized for coefficient of friction on a steel component |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6411117B2 (en) | 1989-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB2070072A (en) | Continuous annealing of cold-rolled low carbon steel strip | |
| JPS6271571A (en) | Heavy corrosion preventive treatment of metallic material | |
| US2376082A (en) | Surface treatment of aluminum and aluminum alloys | |
| JPS62192585A (en) | Surface-treatment of metal | |
| US3345276A (en) | Surface treatment for magnesiumlithium alloys | |
| CN115491625A (en) | Titanium and titanium alloy surface preoxidation modified hot-dip Ti-Al-Si coating and preparation method thereof | |
| JPS58151463A (en) | Method for galvanizing malleable cast iron product without acid treatment | |
| US3397092A (en) | Corrosion-resistant coatings | |
| JPS59232295A (en) | Anodization treatment of aluminum die casting | |
| US4724164A (en) | Methods of mirror manufacture and products made thereby | |
| JPS63274800A (en) | Production of coated product | |
| JPS58110665A (en) | Production of galvanized steel plate | |
| JPS59107097A (en) | Method for coating die cast aluminum alloy | |
| JPH1119587A (en) | Surface treating method for aluminum alloy | |
| CN112760624A (en) | Chromium-free and washing-free environment-friendly coating agent, aluminum material and surface coating treatment method thereof | |
| JPS61250180A (en) | Treatment for black coloring of stainless steel | |
| KR950004777B1 (en) | Manufacturing method of zinc-iron alloyed hot-dip galvanized steel sheet with excellent powdering resistance | |
| JPS61296902A (en) | Hot rolled steel sheet for enamel and its production | |
| SU368346A1 (en) | METHOD FOR PROCESSING STEEL PRODUCTS | |
| SU163861A1 (en) | METHOD FOR PRELIMINARY TREATMENT OF STEELS BEFORE TREATMENT-FREE ENAMELING | |
| KR850000348B1 (en) | Continuous annealing of cold rolled low carbon steel strip | |
| SU1504288A1 (en) | Method of producing refractory coating of ferrous metals and their alloys | |
| JPS59226163A (en) | Corrosion-resistant surface treatment method | |
| CN112725779A (en) | Chromium-free silicon-free washing coating agent, aluminum material and surface coating treatment method thereof | |
| CN113969384A (en) | Hot galvanizing process for electric iron accessory |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |