Abstract

An approach to forming a composite coating via the decomposition of a supersaturated solid solution in the Co–W system is considered. An electrolyte and technological deposition conditions are developed to form an amorphous coating with 45% W at a current efficiency of 69%. Heat treatment at 500°C is found to cause slow crystallization of the solid solution of tungsten in fcc cobalt. An increase in the temperature to 750°C leads to extensive precipitation of a nanocrystalline Co₃W phase, i.e., to the formation of a composite coating. The microhardness of the coating is 1300 HV, which exceeds the microhardness of solid chrome plating.

中文翻译：

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非平衡 Co-W 合金作为纳米复合涂层形成前体的非晶层的电化学合成

摘要

考虑了一种通过在 Co-W 系统中分解过饱和固溶体来形成复合涂层的方法。开发了一种电解质和技术沉积条件，以在 69% 的电流效率下形成具有 45% W 的非晶涂层。发现在 500°C 的热处理会导致钨在 fcc 钴中的固溶体缓慢结晶。温度升高至750℃导致纳米晶Co ₃ W相的大量沉淀，即形成复合涂层。镀层的显微硬度为1300 HV，超过了固体镀铬的显微硬度。