Enhancement of the corrosion properties of cold sprayed Ti–6Al–4V coatings on mild steel via silica sealer,Materials and Corrosion

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Enhancement of the corrosion properties of cold sprayed Ti–6Al–4V coatings on mild steel via silica sealer
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-09-14 , DOI: 10.1002/maco.202112504
Magdi F. Morks _{1,

2} , Saden Zahiri ₂ , Xiao‐Bo Chen ₁ , Stefan Gulizia ₂ , Ivan S. Cole ₁

Affiliation

The pore formation associated with the cold spray process requires the development of an economical sealer to enhance the corrosion resistance of Ti–6Al–4V coatings on a mild steel substrate. Herein, a sound method is developed to seal pores in the cold sprayed Ti–6Al–4V coatings with silica sealer. Potentiodynamic polarization tests in 3.5 wt% sodium chloride electrolyte were employed to investigate the corrosion resistance of cold sprayed Ti–6Al–4V coatings fabricated at two standoff distances (30 and 70 mm) before and after the sealing process. The polarization resistance of cold sprayed Ti–6Al–4V coatings significantly increased by >80% after the sealing process. The electrochemical responses of cold sprayed Ti–6Al–4V were dependant on sealing the pores with agglomerated silica nanoparticles as observed by scanning electron microscopy and energy-dispersive X-ray analysis. The increase in polarization resistance makes the sealer an effective treatment for cold sprayed Ti–6Al–4V coatings used in marine environments and other engineering applications. This sophisticated sealing process can reduce the deposition cost by reducing the thickness of Ti–6Al–4V coatings and increasing their lifetime on metal components.

中文翻译：

通过二氧化硅密封剂增强冷喷涂 Ti-6Al-4V 涂层在低碳钢上的腐蚀性能

与冷喷涂工艺相关的孔隙形成需要开发一种经济的封闭剂，以提高低碳钢基材上 Ti-6Al-4V 涂层的耐腐蚀性。在此，开发了一种使用二氧化硅密封剂密封冷喷涂 Ti-6Al-4V 涂层中的孔的可靠方法。使用 3.5 wt% 氯化钠电解质中的动电位极化测试来研究在密封过程之前和之后在两个间隔距离（30 和 70 毫米）处制造的冷喷涂 Ti-6Al-4V 涂层的耐腐蚀性。冷喷涂 Ti-6Al-4V 涂层的极化电阻在密封过程后显着增加了 >80%。通过扫描电子显微镜和能量色散 X 射线分析观察到，冷喷涂 Ti-6Al-4V 的电化学响应取决于用附聚的二氧化硅纳米粒子密封孔隙。极化电阻的增加使密封剂成为用于海洋环境和其他工程应用的冷喷涂 Ti-6Al-4V 涂层的有效处理方法。这种复杂的密封工艺可以通过减少 Ti-6Al-4V 涂层的厚度并延长其在金属部件上的使用寿命来降低沉积成本。

更新日期：2021-09-14

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