Electrochemical Characterization of Plasma Sprayed Alumina Coatings
Electrochemical Characterization of Plasma Sprayed Alumina Coatings
复制标题
等离子喷涂氧化铝涂层的电化学表征
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
A. Kobayashi
中科院分区：
文献类型：
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作者：
M. F. Morks;I. Cole;P. Corrigan;A. Kobayashi
采用开路电位（OCP）、动电位极化曲线和电化学阻抗谱（EIS）研究了等离子喷涂氧化铝涂层在3.5wt%NaCl溶液中的腐蚀行为。氧化铝涂层钢表现出更高的OCP和更低的腐蚀电流（icorr.）与钢基体相比。然而，局部腐蚀可能发生在涂层/钢界面时，浸泡在腐蚀介质中。其原因是腐蚀溶液通过氧化铝层的孔隙渗透到钢表面。腐蚀产物（主要是铁氧化物）积聚在孔隙内和涂层表面上。氧化铁的存在稍微改善了耐腐蚀性。
Open circuit potential (OCP), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) were employed to characterize the corrosion behavior of plasma-sprayed alumina-coated mild steel in 3.5 wt% NaCl solu-tion. Alumina-coated steel showed higher OCP and lower corrosion current (icorr.) compared with the steel substrate. However, localized corrosion probably occurs at the coat/steel interface when immersed in the corrosive media. The reason for that is the penetration of corrosive solution into the steel surface through the pores of accumulated alumina layers. The corrosion products (mainly iron oxides) accumulate inside the pores and on the coating surface. The presence of iron oxide slightly improved the corrosion resistance.