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Plasma spray can be used to produce coatings. of virtually any metallic, cermet, or ceramic ma-. terial. The coatings are used for most of the types. of applications described in a subsequent section. The transferred plasma-arc process adds to. plasma spray the capability of substrate surface heat-. ing and melting. Figure 7 is a schematic repre-. sentation of the process.
The preferred alloy composition for zinc-nickel plating is 12 â 15% nickel, with the remainder being zinc.This alloy gives exceptional sacrificial corrosion resistance and can be readily passivated. To achieve this alloy, zinc-nickel is usually plated from an alkaline electrolyte.For some applications, including the plating of brake castings, acid zinc-nickel can be used.inally a topcoat can be applied to the zinc-nickel plating and trivalent passivation coatings. The choice of topcoat depends on the application. Advantages of topcoats include: 1  Predictable torque and tension characteristics. 2  Improved corrosion resistance after post-plating deformation operations.