In daily life, we often see the corrosion of metal materials and products. The materials and equipment discarded due to corrosion every year are amazing. According to relevant data, 1/3 of global steel products are consumed by corrosion every year. The loss people suffer from corrosion is not only the value of raw materials, but also the value of carefully processed mechanical parts and equipment is many times higher than that of raw materials. Therefore, people continue to study various ways to prevent metal corrosion.
Function: in the fight against corrosion, people have taken many effective measures. Electroplating is one of the important means. Electroplating can improve the corrosion resistance of metal parts in the service environment; Decorate the appearance of parts to make them bright and beautiful; Improve the working performance of parts, such as hardness, wear resistance, conductivity, electromagnetism, heat resistance, brazing and other special properties.
Requirements: different products have different requirements for coatings, but in terms of their commonness, the main requirements for coatings are:
(1) There should be good adhesion between the coating and the substrate, including between the coating and the coating;
(2) The coating on the main surface of the parts should have a relatively uniform thickness and detailed structure;
(3) The coating shall have the specified thickness and as few pores as possible;
(4) The coating shall have specified indicators. For example, surface roughness, hardness, color and corrosion resistance of salt spray test.
Classification:
(1) Protective coating;
(2) Protective decorative coating;
(3) Restorative coating;
(4) Coating with special requirements: wear-resistant coating, antifriction coating, reflective coating, anti reflective coating, conductive coating, magnetic conductive coating, hot working coating, oxidation-resistant coating, acid resistant coating.