Thermal-sprayed aluminum (Al) coatings are widely used for corrosion protection in marine environments. The corrosive nature of seawater and the synergy with marine microbes make for aggressive service environments for Al coatings. In this study, Al coatings were deposited on 316L stainless steel (316L SS) substrates by using wire arc spraying. Chlorella vulgaris, a typical marine fouling algae, was used to investigate the effects of biofilm adhesion on the electrochemical behavior of wire arc-sprayed Al coatings in artificial seawater environment. Electrochemical measurements via dynamic potential polarization curves and electrochemical impedance spectroscopy were used to monitor the corrosion behavior after attachment of microbes on Al coatings and bare, uncoated 316L SS. Analysis of the corrosion products was conducted using scanning electron microscope and energy-dispersive spectrum. The results showed that the Chlorella vulgaris biofilm slowed the corrosion of the Al coatings. This suggested that Chlorella vulgaris biofilm was a critical contributing factor to the corrosion behavior of the Al coatings. Moreover, a mechanism was suggested to illustrate the corrosion behavior of Al coatings in the presence of Chlorella vulgaris.

中文翻译：

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普通小球藻生物膜粘附对电弧喷涂铝涂层电化学行为的影响

热喷涂铝 (Al) 涂层广泛用于海洋环境中的腐蚀保护。海水的腐蚀性以及与海洋微生物的协同作用为铝涂层提供了腐蚀性的服务环境。在这项研究中，铝涂层通过使用电弧喷涂沉积在 316L 不锈钢 (316L SS) 基材上。小球藻是一种典型的海洋污染藻类，用于研究生物膜粘附对人工海水环境中电弧喷涂铝涂层电化学行为的影响。通过动态电位极化曲线和电化学阻抗谱进行的电化学测量用于监测微生物附着在铝涂层和裸露的未涂层 316L SS 上后的腐蚀行为。使用扫描电子显微镜和能量色散光谱对腐蚀产物进行分析。结果表明，普通小球藻生物膜减缓了铝涂层的腐蚀。这表明普通小球藻生物膜是影响铝涂层腐蚀行为的关键因素。此外，提出了一种机制来说明在普通小球藻存在下铝涂层的腐蚀行为。