Black zinc plating on stainless steel is a common surface treatment method. By coating a layer of black zinc on the surface of stainless steel, not only can the surface hardness of the steel be increased, but the anti-corrosion performance and aesthetics of the steel can also be improved.
Author: Marisa
I、 Introduction
Black zinc plating on stainless steel is a common surface treatment method. By coating a layer of black zinc on the surface of stainless steel, not only can the surface hardness of the steel be increased, but the anti-corrosion performance and aesthetics of the steel can also be improved.
II、 Process flow
1. Cleaning:
Firstly, the stainless steel surface needs to be cleaned to remove oil stains and impurities from the surface. The cleaning methods include mechanical cleaning and chemical cleaning.
2. Acid washing:
After cleaning, acid washing treatment is required. Acid washing can remove surface oxide scale and iron oxide on the surface of steel, increasing the adhesion between the black zinc layer and stainless steel.
3. Treatment:
After pickling, the stainless steel surface needs to be treated to ensure a smooth surface without defects such as burrs or protrusions.
4. Activation:
After the treatment is completed, the surface needs to be activated to change the chemical properties of the surface and enhance the adsorption ability of the steel surface to the coating.
5. Black zinc coating:
After the treatment is completed, coating can begin. Black zinc coating is carried out by electroplating method, forming a layer of black zinc alloy on the surface of stainless steel through electrochemical action.
6. Spray dehydrating agent:
After confirming the completion of black zinc plating, spray dehydrating agent treatment is required to remove residual moisture and solution on the surface.
III、 Possible problems and solutions
1. Incomplete coating:
The common solution is to change the coating conditions and perform more thorough treatment and activation treatment on the steel surface before coating.
2. Bubbles or cracks appear in the black zinc layer:
In this case, it is necessary to adjust the coating time and temperature to ensure a balance between temperature and time.
3. Uneven color and gloss of the black zinc layer:
At this time, it is necessary to adjust the ratio of the black zinc coating material and the electroplating conditions.
4. Easy peeling of coating:
More thorough treatment and testing are needed for the pre-treatment and activation treatment of black zinc coating.
IV、 Conclusion
By reading this article, readers can understand the process flow and possible problems of stainless steel black zinc coating, as well as corresponding solutions. Corresponding measures can be taken for different problems and situations to achieve the best effect of black zinc plating on stainless steel.