Improving wear and corrosion protection of AISI 304 stainless steel by Al2O3-TiO2 hybrid coating via sol-gel process

Transactions of the IMF Pub Date : 2022-09-12 DOI:10.1080/00202967.2022.2117884

R. Gecu, B. Birol, Mücahid Özcan

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引用次数: 5

Abstract

ABSTRACT Al2O3, TiO2, and Al2O3-TiO2 coatings were deposited on AISI 304 stainless steel plates by the sol–gel dipping technique, and the effects of the coating composition on microstructure, wear, and corrosion characteristics were examined. Tribological features were determined by ball-on-disc sliding tests against an Al2O3 ball under a 10 N load, while corrosion properties were evaluated by potentiodynamic polarisation tests performed in 3.5% wt. NaCl solution. γ-Al2O3, α-Al2O3, and rutile phases were detected in the hybrid coatings. The highest coating thickness was obtained in single Al2O3 film and decreased with an increasing amount of TiO2 nanoparticles. The single Al2O3 layer had both the highest wear resistance and the lowest corrosion resistance. Although TiO2 addition caused an increase in the wear rate, it improved the corrosion resistance of the coating by filling the voids in the Al2O3 film. The Al2O3-TiO2 hybrid film with a relative ratio of 6:1 as a candidate for the wear- and corrosion-resistant coating decreased wear and corrosion losses of the 304 substrates by 83% and 97%, respectively.

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溶胶-凝胶法制备Al2O3-TiO2杂化涂层，提高AISI 304不锈钢的耐磨性和防腐蚀性能

摘要:采用溶胶-凝胶浸渍技术在AISI 304不锈钢表面沉积Al2O3、TiO2和Al2O3-TiO2涂层，研究涂层成分对其显微组织、磨损和腐蚀性能的影响。摩擦学特性是通过在10 N载荷下对Al2O3球进行球盘滑动测试来确定的，而腐蚀特性是通过在3.5% wt. NaCl溶液中进行的动电位极化测试来评估的。杂化涂层中存在γ-Al2O3、α-Al2O3和金红石相。单Al2O3膜层厚度最大，随TiO2纳米颗粒用量的增加而减小。单Al2O3层的耐磨性最高，耐蚀性最低。TiO2的加入虽然增加了涂层的磨损率，但通过填充Al2O3薄膜中的空隙，提高了涂层的耐蚀性。相对比例为6:1的Al2O3-TiO2杂化膜作为耐磨损和耐腐蚀涂层的候选材料，其磨损和腐蚀损失分别降低了83%和97%。

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Transactions of the IMF

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