Corrosion protection investigations of oxide‐silane composite coating on hot dip aluminized steel

Materials and Corrosion Pub Date : 2024-08-12 DOI:10.1002/maco.202414506

Zhong‐Xia Liu, Lei Shi, Ai‐Yun Jiang, Jian‐Xiu Liu, Bao‐Feng Zhang, Ya‐Jun Zhou, Guo‐Peng Zhang

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Abstract

The hot dip aluminized ASTM 1035 steels (Al‐coated steel) underwent anodic oxidization, and various thicknesses of Al2O3 coating were applied to the surface of the Al‐coated steels (Al–Al2O3‐coated steel). The corrosion resistance of the Al–Al2O3‐coated steel was investigated using potentiodynamic tests, electrochemical impedance spectroscopy tests and measurement of galvanic current density in a bimetallic cell. It was found that the anodic oxidation resulted in the formation of a porous Al2O3 coating on the surface of the Al‐coated steel, improving both its corrosion resistance and galvanic corrosion resistance when coupled with carbon fiber reinforced nylon 6 composite (Cf/PA6). Silane treatment effectively sealed the pores within the Al2O3 coating, resulting in improved corrosion protection for Al–Al2O3‐coated steel due to the exceptional insulation, impermeability and hydrophobic properties of silane coating. Compared to the Al‐coated steel/carbon fiber reinforced polymer (CFRP) couple and Al–Al2O3‐coated steel/CFRP couple, stable galvanic current density decreased by approximately 75% and 45%, respectively.

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热浸镀铝钢氧化物-硅烷复合涂层的腐蚀防护研究

对热浸镀铝的 ASTM 1035 钢（Al 涂层钢）进行阳极氧化，并在 Al 涂层钢（Al-Al2O3 涂层钢）表面涂上不同厚度的 Al2O3 涂层。使用电位测试、电化学阻抗谱测试和双金属电池中电化学电流密度的测量方法研究了 Al-Al2O3 涂层钢的耐腐蚀性。研究发现，阳极氧化可在铝涂层钢表面形成多孔的 Al2O3 涂层，与碳纤维增强尼龙 6 复合材料（Cf/PA6）结合使用时，可提高其耐腐蚀性和耐电化学腐蚀性。硅烷处理有效地封闭了 Al2O3 涂层内部的孔隙，由于硅烷涂层具有优异的绝缘性、不渗透性和疏水性，因此 Al-Al2O3 涂层钢的防腐蚀性能得到了改善。与铝涂层钢/碳纤维增强聚合物 (CFRP) 组合和铝-Al2O3 涂层钢/碳纤维增强聚合物 (CFRP) 组合相比，稳定的电化学电流密度分别降低了约 75% 和 45%。

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Materials and Corrosion

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