A corrosion-resistant non-crystalline coating was fabricated by plasma electrolytic oxidation (PEO) on Q235 low carbon steel for ship pipes. The distribution and composition of chemical elements and phases of PEO coatings were analyzed by an orthogonal experiment, and the formation mechanism of PEO coatings was discussed. The corrosion current densities and corrosion potentials were measured. The results indicated that the formation of a transition layer mainly containing Fe₃O₄ was crucial for achieving an excellent coating quality. Furthermore, the corrosion current density of coated steel was reduced by 78% compared with the bare steel.

中文翻译：

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等离子电解氧化制备船舶低碳钢管防腐非晶涂层

采用等离子电解氧化（PEO）在船管用Q235低碳钢上制备耐腐蚀非晶涂层。通过正交试验分析了PEO涂层化学元素和相的分布和组成，探讨了PEO涂层的形成机理。测量腐蚀电流密度和腐蚀电位。结果表明，主要含有Fe ₃ O ₄的过渡层的形成对于获得优异的涂层质量至关重要。此外，与裸钢相比，涂层钢的腐蚀电流密度降低了 78%。