What are the surface treatments of stainless steel screws（一）

Now the majority of stainless steel screws will be used in high-end products, medical equipment and kitchen supplies. What surface treatment can stainless steel screws do?

The first thing we need to know is what are the surface treatments?

Surface treatment is electroplating, passivation, sandblasting, mirror, polishing.

Among them, electroplating can be divided into environmental protection black zinc, environmental protection white zinc, environmental protection green zinc, environmental protection blue zinc, environmental protection color zinc, environmental protection nickel, anodic oxidation, electrophoresis, gold plating, silver plating, rose gold plating, natural color, dacromet and so on.

And stainless steel can do the surface treatment has: environmental protection black zinc, dacro, sandblasting, polishing, electrophoresis, electrogold, passivation, vacuum plating and so on.

Environmental protection black zinc: deoiling – cleaning – weak acid etching – galvanizing – cleaning – passivation – cleaning – drying – rack. The final rack is mainly black oil, tian na water, rubber water according to a certain ratio of good, its main role is to improve the environmental protection black zinc stainless steel screw surface black uniformity and brightness and enhance the environmental protection black zinc stainless steel screw corrosion resistance. But shi shi tong does not recommend stainless steel screws to use the surface treatment of environmental protection black zinc, because the stainless steel screws and zinc adhesion is not strong, the effect of electroplating out sometimes is not good, in the actual use of the coating will be scratched.

The dacromet finishes are available in black and white, depending on which color the customer prefers. The process flow is as follows: organic solvent degreasing — mechanical shot blasting — spraying — baking — secondary spraying — baking — drying. The following points should be noted during the dacromet plating process:

1. Dacromet rapidly ages under light, so the dacromet coating process should be carried out indoors.
2. If the baking temperature of dacro is too low or too high, dacro will lose its anticorrosion ability. Dacro should be baked in a proper temperature range.

The use cycle of dacro is very short, so it should be used up as soon as possible.

4 dacromet wear resistance is poor, so should be coated with dacromet, and then coated with wear resistance of other coatings closed.

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