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Comparison on long-term corrosion performance of WC-CoCr and Al2O3-TiO2 ceramic coatings in sulphide-containing 3.5 wt% NaCl solution
International Journal of Refractory Metals & Hard Materials ( IF 3.6 ) Pub Date : 2022-05-27 , DOI: 10.1016/j.ijrmhm.2022.105906
Ziyu Wei , Sheng Hong , Zheng Wei , Ning Hu , Guobing Ying , Yuping Wu

In this study, the WC-CoCr coating and Al2O3-TiO2 coating were deposited by high-velocity oxygen-fuel (HVOF) spraying and atmospheric plasma spraying (APS), respectively. Both coatings were immersed in 3.5 wt% NaCl solution with 20 ppm Na2S to investigate their long-term corrosion resistances in the simulated seawater environment. The corrosion behaviors of both coatings for different times were investigated by potentiodynamic polarization, EIS, XRD, EDS and SEM. The electrochemical measurement results showed that the corrosion resistance of both coatings decreased obviously after long-term immersion in sulphide-containing solution, while the Al2O3-TiO2 coating exhibits more stable corrosion performance during the whole immersion process compared with the WC-CoCr coating. The corrosion resistance of the WC-CoCr coating in sulphide-containing solution after long-term immersion was inferior to that of the Al2O3–40TiO2 coating.



中文翻译:

WC-CoCr 和 Al2O3-TiO2 陶瓷涂层在含硫化物 3.5 wt% NaCl 溶液中的长期腐蚀性能比较

在这项研究中,WC-CoCr 涂层和 Al 2 O 3 -TiO 2涂层分别通过高速氧燃料(HVOF)喷涂和大气等离子喷涂(APS)沉积。两种涂层均浸入含 20 ppm Na 2 S 的 3.5 wt% NaCl 溶液中,以研究它们在模拟海水环境中的长期耐腐蚀性能。通过动电位极化、EIS、XRD、EDS和SEM研究了两种涂层在不同时间的腐蚀行为。电化学测量结果表明,在含硫化物溶液中长期浸泡后,两种涂层的耐腐蚀性能明显下降,而Al 2 O 3 -TiO 2与WC-CoCr涂层相比,涂层在整个浸泡过程中表现出更稳定的腐蚀性能。WC-CoCr涂层在含硫化物溶液中长期浸泡后的耐蚀性不如Al 2 O 3 –40TiO 2涂层。

更新日期:2022-05-31
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