Nanoindentation investigations of electrodeposited on steel substrate corrosion-protective zinc coating, additionally improved by Cr III conversion layer

International Journal of Civil and Structural Engineering Pub Date : 2018-09-17 DOI:10.15224/978-1-63248-150-4-35

D. Guergova, D. Stoychev, N. Boshkova, R. Iankov, S. Cherneva

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Abstract

The protective Zn coatings on steel substrates are preferable because the zinc layers play a role of “sacrificial coatings” due to their more negative electrode potential compared to steel substrate. Besides, their protective ability strongly depends from aggressive nature of environment, which determines the need of additional efforts. Vastly improvement of the chemical stability and protective ability of the Zn coatings give the additional treatments aiming the formation of “finishing“ conversion layer with desired chemical-resistant composition on the Zn surface influencing against corrosion attack. Having in mind the chemical nature of the conversion layers, it is possible to predict the improvement of the chemical and mechanical properties of the system “Conversion layer”/”Zinc coating”/”Steel substrate”. The present study shows the results obtained concerning the indentation modulus and indentation hardness of the Cr III conversion layers and their dependence in the depth of indentation for the studied systems. The thickness of the steel substrate, protective Zn coating and finishing conversion layer are 820, 5 and 0,15 μm, respectively. It was established that the system “Conversion layer”/”Zinc coating”/”Steel substrate” is characterized with higher indentation hardness and modulus than the system ”Zinc coating”/”Steel substrate”, which improves their wear resistance and corrosion protection. Keywords—nanoindentation, mechanical properties, corrosion-protective zinc coatings, conversion layers

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电沉积钢基体上的纳米压痕研究

钢基板上的保护性锌涂层是优选的，因为锌层与钢基板相比具有更多的负极电位，因此起到了“牺牲涂层”的作用。此外，它们的保护能力在很大程度上取决于环境的攻击性，这决定了它们需要额外的努力。由于锌镀层的化学稳定性和防护能力得到了极大的提高，因此在锌表面形成了具有所需耐化学成分的“精加工”转化层，从而影响了锌的抗腐蚀能力。考虑到转换层的化学性质，可以预测“转换层”/“锌涂层”/“钢基体”体系的化学和机械性能的改善。本文给出了所研究体系的Cr III转换层的压痕模量和压痕硬度及其与压痕深度的关系。钢基体厚度为820 μm，锌保护层厚度为5 μm，精加工转化层厚度为0.15 μm。结果表明，“转换层”/“锌涂层”/“钢基体”体系的压痕硬度和模量高于“锌涂层”/“钢基体”体系，提高了其耐磨性和防腐蚀性能。关键词:纳米压痕;力学性能;防腐锌涂层

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International Journal of Civil and Structural Engineering

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