College of Mechanics and Materials, Hohai University, 8 Focheng West Road, Nanjing 211100, PR China.
College of Mechanics and Materials, Hohai University, 8 Focheng West Road, Nanjing 211100, PR China.
Ultrason Sonochem. 2021 Apr;72:105438. doi: 10.1016/j.ultsonch.2020.105438. Epub 2020 Dec 24.
In this study, high-velocity oxygen-fuel (HVOF) sprayed nanostructured WC-10Co-4Cr coatings were subjected to seawater with sulfate-reducing bacteria (SRB) for different time. The effect of ultrasound-assisted sealing with aluminum phosphate on the microstructural features and microbial influenced corrosion (MIC) behavior was evaluated using scanning electron microscopy (SEM), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results showed that the ultrasound-assisted sealing promoted the infiltration of the sealant into as-sprayed coating, enhanced the resistance values of about one order of magnitude, and reduced the corrosion current density. During the whole immersion period, the MIC process of both unsealed and sealed coatings can be divided into two different stages, and the ultrasound-assisted sealing treatment significantly delayed the MIC process, suggesting that the ultrasound-assisted sealing with aluminum phosphate is an effective way for controlling the MIC of SRB on the WC-10Co-4Cr cermet coatings in marine environment.
在这项研究中，高速氧燃料（HVOF）喷涂的纳米结构 WC-10Co-4Cr 涂层在含有硫酸盐还原菌（SRB）的海水中经历了不同时间的浸泡。采用磷酸铝超声辅助密封处理，通过扫描电子显微镜（SEM）、动电位极化和电化学阻抗谱（EIS）评估了其对微观结构特征和微生物影响腐蚀（MIC）行为的影响。结果表明，超声辅助密封处理促进了密封剂渗透到喷涂涂层中，将电阻值提高了约一个数量级，并降低了腐蚀电流密度。在整个浸泡期间，未密封和密封涂层的 MIC 过程可以分为两个不同的阶段，超声辅助密封处理显著延迟了 MIC 过程，表明磷酸铝的超声辅助密封处理是控制 SRB 对海洋环境中 WC-10Co-4Cr 金属陶瓷涂层 MIC 的有效方法。
