行业知识

Dacromet Application FAQ

Edit:Xinxiang Chui Auto Parts Co., Ltd.UpDate:2018-02-24

ForDacromet CoatingHow much do you know about common problems during use? What are the specific characteristics of the dacromet coating?

Dacromet coating process is the raw material into a water-soluble coating, and then directly coated in the activation of the workpiece surface, after drying, sintering to form a layer of inorganic film.

Now let's talk about its use FAQ:

1, the instability of the coating: because the density of zinc powder is relatively large, when the deployment of paint is very easy to precipitate, so that the coating layer, this must be the selection of efficient thickening agent. The use of polyacrylic acid sodium to thicken the coating, when the addition of excessive, the coating is very easy to gel, thereby shortening the service period. It is unsuitable to look at the life of the coating and the production efficiency.

2, coated surface color: The use of advanced raw materials after the work of coating, after treatment, the surface color is silvery white, in the process of production, it is found that the ratio of zinc powder and aluminum powder has a greater effect on the color, increase the amount of aluminum powder can increase the silver luster of the workpiece, the increase of aluminum powder, the workpiece corrosion resistance has a certain impact;

3, the effect of mixing time on the quality of zinc-chromium film: The oil mixture must be stirred, so that the slurry and chromic acid and other components are mixed evenly and reflect the aging, with a good coating of the use of time, in the airtight container storage, and stirring, can be used for 3 days;

4, the effect of the ph value of chromic acid: In the solution, there is a component that must be considered, that is, chromic acid solution. In the actual preparation process, if the ph value of chromic acid is high, the reaction of chromic acid and slurry is very intense, releasing a lot of heat, and finally the whole solution system caking and failure. If the water dilution after the coating, the workpiece surface adhesion decreased, very easy to start the skin;

5, the impact of wetting agent: Rockwell coated workpiece are steel parts, coating on the workpiece surface wetting, spreading good or bad, directly affect the quality of the layer. If wetting, spreading is not good, will make the workpiece surface leakage, need to be coated to cover the surface of the workpiece, resulting in coating unevenness of the coating, the process of the coating of the general problems you know? Reduced corrosion resistance.

Dacromet coating refers to the use of water-based zinc-chromium coatings dipped, brushed or sprayed on steel parts or components of the surface, baked by the scale of zinc and zinc chromate as the main component of the inorganic anti-corrosion layer.