Electroplating repair coating and functional coating for electric heating tubes

Electroplating repair coating and functional coating for electric heating tubes

A coating that can cause local or overall thickening or restoration of size of a workpiece that can cause local wear is called a restorative coating. Some major mechanical components, such as trains and cars. Large shafts, crankshafts, gears, etc. on machinery such as petrochemicals can be repaired by electroplating to extend their service life. Deep well pump shafts can be repaired by electroplating hard chromium or iron.

Functional coating

Functional coatings utilize the various mechanical, physical, and chemical properties of the coated metal to meet the needs of various occasions. Based on the performance of the coatings, they can be further divided into the following main categories.

① Wear resistant and anti friction coating. The wear resistance of the products is increased by improving the surface hardness of the products. In industry, hard chromium plating is often used, such as the journals of various shafts and crankshafts, the roll surfaces of printing rollers, the inner walls of engine cylinders and piston ring, and the inner cavities of stamping dies; Lead tin alloy and lead tin copper alloy are used as antifriction coatings for sliding contact surfaces to lubricate and reduce sliding friction.

② High temperature oxidation resistant coating. Plating a high-temperature oxidation resistant layer on the surface of components that may be oxidized (high-temperature corrosion) at high temperatures to improve the high-temperature oxidation resistance of the component surface. Certain special purpose workpieces made of high melting point metal materials such as jet engine rotors and blades require nickel or chromium plating. Platinum germanium alloy plating; In some cases, composite coatings such as nickel germanium oxide are also used. Nickel alumina and other materials are used to improve the high-temperature oxidation resistance of metal materials.

③ Magnetic coating. Magnetic materials are required for magnetic rings, drums, disks, and magnetic film storage components in electronic computer equipment. Commonly used magnetic alloy coatings include cobalt nickel, nickel iron, nickel phosphorus cobalt, etc. Currently, electroplating and chemical plating methods are commonly used to prepare magnetic materials to meet these requirements. By changing the electroplating process parameters, the magnetic properties of the coating can also be adjusted.

④ Weldable coating. Some electronic components require brazing during assembly. To improve their soldering performance, tin, silver, or tin lead alloys are usually plated. Gold and other coatings belong to this category. If wear resistance is also required, silver antimony alloy can be plated. Gold cobalt alloy, gold antimony alloy, etc.

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