1993-04-01

Investigation of Four Wear-Resistant Topcoat Materials with Zinc Nickel as the Corrosion-Resistant Undercoat 931051

Limitations on designs are often determined by the properties of the materials used rather than the inventiveness and creativity of the designer or engineer. The designer or engineer may choose a material that possesses all of the essential properties such as strength, weight, and rigidity, while embodying only selected surface properties such as hardness, wear resistance, and conductivity. Selecting the appropriate coating will produce beneficial, engineered surface properties.
In general, the suitability of any coating depends on its purpose. Unfortunately, some coatings or combinations of coatings introduce detrimental features to characteristics of the other coatings or even the base material itself. Our goal is to provide a functional, corrosion resistant, metal finishing system consisting of the application of two different coatings which act synergistically to provide enhanced corrosion- and wear resistance. The assessment criteria are the coating's amount of protection against corrosion, uniformity of structure, and the coefficient of friction.
This paper documents the material choices and testing undertaken in pursuit of a corrosion- and wear-resistant, dual-coating process. An undercoat of a known corrosion-resistant material was combined with various wear-resistant topcoats. Corrosion and wear tests were completed on each combination to define its capabilities.
The result is a corrosion- and wear-resistant finish which provides consistent performance even with process variations beyond those encountered in commercial practice.

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