Effects of Chromate Conversion Coating on Plating
Chromate conversion coating, also known as chromate conversion and chromate passivation, is a protective treatment applied to zinc electroplated coatings on steel and aluminum substrates in order to improve corrosion protection. The chromate treatment is generally applied after the plated surface has been cleaned and free of contaminants such as oil and other particles. The chromate treatment improves corrosion resistance by providing a protective coating to the plated surface.
The chromate conversion process begins by first preparing the substrate surface. The surface should be free from any dirt, oil, grease, or other contaminants. The plated surface can then be treated with a chromate conversion solution or a chromating solution to form a protective layer. The chromating solution will contain a chromate compound, such as zinc chromate, which will form a protective film over the plated surface. This film will act as a barrier to further corrosion, while also providing additional protection from wear and tear.
Once the surface has been properly prepared, the chromating solution is then applied using an applicator such as a brush, roller, or sprayer. It is important to follow the manufacturer’s instructions carefully when applying the chromating solution to avoid any problems that may occur. After the chromating solution has been applied, the surface is then allowed to dry. After the surface has been dried, additional steps may be taken to add additional layers of protection, such as a top coat or a lacquer, to the chromated surface.
There are several advantages to applying a chromate conversion coating to plated surfaces. One of the major advantages is that it increases corrosion resistance. Chromates are effective in increasing the corrosion resistance of different plated surfaces, including zinc and aluminum substrates. The increased corrosion resistance is due to the formation of protective chromate oxide films, which act as a barrier to corrosive environments. Additionally, chromated surfaces can also provide improved wear and scratch resistance created by the increased hardness of the chromate coating.
Chromate conversion coatings can also help enhance the aesthetic appearance of the plated surface and add an attractive finish. The chromate conversion coating can also offer protection from environmental factors such as rain, snow and other debris, which may not normally adhere to the surface.
The effectiveness of chromate conversion coatings depends on several factors. One of the most important factors is the quality of the substrate surface being treated. If the substrate surface is not properly prepared, the chromate conversion coating will not effectively protect the plated surface. Additionally, the choice of chromate compound used and the type of applicator used can impact the overall effectiveness of the chromate conversion coating. The substrate and chromate compound should be chosen based on the type of application and the environment to which the plated surface will be exposed.
In conclusion, chromate conversion coatings are an effective and economical method for improving the corrosion protection and aesthetic appearance of plated surfaces. The chromate conversion coating can be effective in increasing the corrosion resistance of zinc and aluminum substrates and can also provide improved wear and scratch resistance when applied properly. It is important to consider the substrate surface and choose the appropriate chromate compound and application technique when applying chromate conversion coatings.
