Plastic plating-electroplating quality standard-salt spray test standard and specification.
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Surface treatment people know that the coating is mainly used to decorate the appearance and protect the substrate from corrosion. Today, China Electroplating Network will share with you about the salt spray test of electroplated parts.
1. The so-called corrosion of salt spray.
Corrosion is the damage or deterioration of materials or their properties under the action of the environment. Most of the corrosion occurs in the atmospheric environment, which contains corrosion components and corrosion factors such as oxygen, humidity, temperature changes and pollutants. Salt spray corrosion is a common and most destructive atmospheric corrosion. The salt fog here refers to the atmosphere of chloride, and its main corrosion component is the chloride salt in the ocean-sodium chloride, which mainly comes from the ocean and inland saline-alkali areas.
The corrosion of salt spray on the surface of metal materials is caused by the electrochemical reaction between the oxide layer and protective layer of the metal surface and the internal metal. At the same time, chloride ion contains a certain hydration energy, which is easy to be squeezed out by pores and cracks adsorbed on the metal surface and replace the oxygen in the chloride layer, turning the insoluble oxide into soluble chloride and the passivated surface into an active surface. Cause extremely bad adverse reactions to the product.
two。. Salt spray test and its connection with practice.
Salt spray test is a kind of environmental test which mainly uses the artificial simulated salt spray environmental conditions created by salt spray test equipment to assess the corrosion resistance of products or metal materials. It can be divided into two categories, one is natural environmental exposure test, the other is artificial accelerated simulated salt spray environment test. The artificial simulated salt spray environment test is to use a kind of test equipment with a certain volume space-salt spray test chamber, in its volume space to create a salt spray environment to assess the corrosion resistance and quality of the product.
Compared with the natural environment, the salt concentration of chloride in the salt spray environment can be several times or dozens of times that of the general natural environment, which greatly improves the corrosion rate. The salt spray test of the product is also greatly shortened. If a product sample is tested in a natural exposure environment, it may take one year for it to be corroded, while in an artificial simulated salt spray environment, similar results can be obtained only for 24 hours.
3. Scope of application:
1) Copper + nickel + chromium or nickel + chromium plating on the surface of iron and steel.
2) Nickel + chromium plating on copper or copper alloy surface.
3) Nickel + chromium plating on 300 series or 400 series stainless steel.
4) Copper + nickel + chromium plating on the surface of aluminum or aluminum alloy.
5) Copper + Nickel + Chromium plating on Zinc Alloy.
6) plastic electroplated parts
