Electroplating of Steel Materials
Electroplating of Steel Materials
(1) Material processing
Steel is used in all industrial sectors and is transformed into products and electroplated through the following metal processing processes.and electroplated
1) Mechanical processing such as bending, cutting, stretching, cutting, grinding, etc. is carried out through stamping and other means.
2) Melt cast iron or iron alloy before casting, or heat it before forging.
3) Surface hardening is carried out through heat treatment (such as quenching and nitriding).
4) Fill the iron powder into the mold, shape it and sinter it.
From this, it can be seen that even if they are all referred to as steel, there will be significant differences in the condition of the metal surface based on the aforementioned series of steel types, metal processing types, and their different records, and corresponding surface treatment methods must be adopted.
When implementing electroplating, the adhesion of the coating to the material and the surface smoothness state of the coating are particularly important indicators. Chemical pretreatment (such as degreasing and acid treatment) is the key to the former, while mechanical pretreatment (such as mirror polishing and surface sanding treatment) is the key to the latter.
(2) Dehydrogenation treatment of high carbon steel and other materials
A special concern for steel materials is the post-treatment after electroplating. When carbon steel or quenched and hardened steel with a carbon content exceeding 0.4% is subjected to acid pickling, galvanizing, or industrial chromium plating treatment, atomic hydrogen is generated on the surface of the material during the treatment process, and hydrogen atoms are absorbed into the microstructure of the steel. If the product is used without removing hydrogen gas, it will become a defect product with extremely high hardness but very brittleness. This phenomenon is called hydrogen embrittlement.
To prevent this situation, hydrogen in the material should be removed by heat treatment (baking treatment) within 4 hours after electroplating. Here are some examples to illustrate
Dehydrogenation treatment conditions
(1) Material processing
Steel is used in all industrial sectors and is transformed into products and electroplated through the following metal processing processes.and electroplated
1) Mechanical processing such as bending, cutting, stretching, cutting, grinding, etc. is carried out through stamping and other means.
2) Melt cast iron or iron alloy before casting, or heat it before forging.
3) Surface hardening is carried out through heat treatment (such as quenching and nitriding).
4) Fill the iron powder into the mold, shape it and sinter it.
From this, it can be seen that even if they are all referred to as steel, there will be significant differences in the condition of the metal surface based on the aforementioned series of steel types, metal processing types, and their different records, and corresponding surface treatment methods must be adopted.
When implementing electroplating, the adhesion of the coating to the material and the surface smoothness state of the coating are particularly important indicators. Chemical pretreatment (such as degreasing and acid treatment) is the key to the former, while mechanical pretreatment (such as mirror polishing and surface sanding treatment) is the key to the latter.
(2) Dehydrogenation treatment of high carbon steel and other materials
A special concern for steel materials is the post-treatment after electroplating. When carbon steel or quenched and hardened steel with a carbon content exceeding 0.4% is subjected to acid pickling, galvanizing, or industrial chromium plating treatment, atomic hydrogen is generated on the surface of the material during the treatment process, and hydrogen atoms are absorbed into the microstructure of the steel. If the product is used without removing hydrogen gas, it will become a defect product with extremely high hardness but very brittleness. This phenomenon is called hydrogen embrittlement.
To prevent this situation, hydrogen in the material should be removed by heat treatment (baking treatment) within 4 hours after electroplating. Here are some examples to illustrate
Dehydrogenation treatment conditions
