The coating treatment process of gold mirror stainless steel sheet mainly includes the following steps:
1. Surface pretreatment
Before coating treatment, the stainless steel sheet needs to be thoroughly pretreated. This step is crucial because the cleanliness and roughness of the surface will directly affect the adhesion of the coating. The first is degreasing treatment, using organic solvents or alkaline solutions to remove impurities such as grease and oil on the surface of the stainless steel plate.
Then it is pickling. By using mixed acid such as nitric acid and hydrofluoric acid, the oxide layer, rust spots and other substances that may affect the quality of the coating on the surface of the stainless steel sheet are removed, so that the surface presents a metallic luster. After pickling, water washing is also required to ensure that there is no residual acid on the surface. Some processes also include grinding or sandblasting of the stainless steel plate to increase the surface roughness and improve the adhesion of the coating.
2. Primer coating
The pretreated stainless steel plate will first be coated with a layer of primer. The role of the primer is to enhance the bonding strength of the coating with the stainless steel substrate and provide certain anti-corrosion properties. Common types of primers include epoxy primers, etc. Primer coating can be applied by spraying, roller coating, etc.
3. Gold coating treatment
Gold coating can be achieved in many ways. One is to use electroplating process, and the electroplating solution containing gold salt or imitation gold components is used under the action of direct current to deposit metal ions on the surface of stainless steel plate to form a gold coating. Another is to use thermal spraying technology to heat and melt gold powder or wire and then spray it onto the stainless steel plate. There are also methods such as chemical plating and vacuum coating. For example, magnetron sputtering technology in vacuum coating can sputter gold or gold alloy target material onto the surface of stainless steel plate under vacuum environment to form a high-quality gold coating.
4. Topcoat coating
After the gold coating is completed, a layer of topcoat may be applied as needed. Topcoat can protect the gold coating, increase gloss and wear resistance. For example, using polyurethane topcoat, spraying can improve the durability and beauty of the entire coating system.
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