Abstract

Abstract In cold metal-forging processes, low-friction coatings often provide the main part of the lubrication. In many cases, zinc phosphate stearate (ZPS) coatings are used. Many parameters affect the coatings' quality and performance. In this paper the typical Brinell indentation test is used to answer two industrial requirements: first, to reveal the sensitivity of the coating with regard to the ageing of the processing baths and phosphating time and, second, to make clear the correlation between the bulk properties of the coated surface and the tribological performance of the ZPS coatings. It is shown that a single configuration of the Brinell indentation test and a statistical analysis of the measurements provides answers to these questions.

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