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Corrosion resistance of Cu-Ni alloy

2018-08-21
At normal temperature, nickel is well protected from atmospheric, water and lye, and has high stability in alkalis, salts and organic acids. Cu-Ni alloy has good resistance to seawater corrosion and marine bioadhesion. The copper-nickel alloy coating has a high corrosion resistance, probably because the metallic nickel enhances the bonding force between the plating atoms. In addition, nickel also has a strong passivation ability, which can quickly form a very thin passivation film in the air, which will inhibit the further dissolution activity of the alloy, thereby improving the corrosion resistance of the alloy coating.
 
There are many methods for detecting corrosion resistance of alloys, and the salt spray corrosion resistance test is one. Salt spray corrosion resistance tests include natural environmental exposure test and artificial accelerated simulated salt spray environmental test. Because natural environment exposure tests take a long time, laboratory experiments generally use artificial accelerated simulated salt spray tests. Neutral salt spray test is one of the important methods to simulate the environmental climate of coastal areas and is used to investigate the corrosion resistance of alloys. It is widely used in aerospace, military parts, electronic parts, electronic components and ships, chemical equipment and other fields.
 
The salt spray electrochemically corrodes the metal material, and its corrosion mechanism: the conductive salt solution penetrates into the metal material and chemically reacts with the metal to form a micro-battery system, that is, "low-potential metal-electrolyte solution-high-potential impurity". Because of the electron transfer in this system, the anode metal dissolves, forming a new compound, a corrosive substance [27]. It should be noted that the test piece cannot be directly in contact with the box in the box, and should be hung or placed on a special shelf. Since the electrodeposited copper-nickel alloy is in the form of a sheet, it should be at an angle of l5° to 30° with the plane.