A kind of preparation method of nickel alloy 400um coating

       A kind of preparation method of nickel alloy 400um coating

【Technical field】

The present invention relates to protection technical field, particularly relate to a kind of preparation method of magnesium alloy 400um coating.

【Background technique】

[0002] Plasma spraying occupies the most important position in thermal spraying technology. Coatings with various properties can be obtained. The coating is flat and smooth with precise thickness control. The coating has low porosity and high bonding degree, the coating porosity can be controlled at 1%-10%, and the bonding strength can reach 60-70MPa. Compared with electric forging, electric brushing, carburizing and nitriding, the plasma spray coating is thicker, harder and more anti-corrosion effect. The thermal influence of the spraying process on the substrate is small, and the substrate structure will not change. The heating temperature of the workpiece can be controlled below 250 °C, so it can also be sprayed on non-metallic materials such as plastics, paints, glass, asbestos cloth, etc. Plasma spraying is carried out by using plasma arc. Plasma arc is a compression arc. Compared with free arc, its arc column is thin, the current density is large, and the gas ionization degree is high. Therefore, it has the characteristics of high temperature, concentrated energy and good arc stability. . Plasma spraying is an extremely important process technology in the field of thermal spraying technology, and most of contemporary thermal spraying materials can be prepared into coatings with good performance by plasma spraying technology. Due to the extremely high flame temperature and extremely fast speed of plasma spraying, almost any material can be melted and sprayed, and the formed coating has the advantages of high bonding strength, low porosity, high spraying efficiency, and wide application range. It is widely used in metallurgy, machinery, rolling stock, etc. The lack of plasma spraying is that when the sprayed layer is thick, cracking may occur.