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nature : the first part is on the nickel plating layer (12-15 microns), and then another layer of nickel plating layer of cadmium (3-5 microns), and finally in 335 ° C for 1 hour Diffusion. Formation of nickel-cadmium metal compounds between the diffusion layer, high melting point at 500 ° C with good thermal stability and good oxidation resistance, heat resistance and corrosion resistance. Right substrate materials stress corrosion resistance can be greatly improved, and it applies to medium temperature high strength steel, low alloy steel and stainless steel protection. The operating temperature of 500 ° C below the parts can provide good protection performance. Over parts of cadmium plating protection, but the use of a VIP only in the temperature of 230 ° C, otherwise it can not be protective role, and will lead to some of cadmium brittle materials. Switch to the proliferation of nickel-cadmium plating, can satisfy the requirements for protecting. Nickel-cadmium diffusion coating has been applied to the aviation industry.
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