The corrosion behaviors of Ni–Cr and 20MnSi steel bars in a simulated marine atmosphere are compared using alternate immersion corrosion tests and electrochemical techniques. The microstructure features are characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrochemical measurements and alternate immersion corrosion tests demonstrate that the Ni–Cr steel bar has a more positive potential (– 0.397 V), lower corrosion current density (28.19 μA/cm2), and better corrosion resistance at a corrosion rate of 3.81 g/(m2· h) and corrosion depth of 4.27 mm/g. There are inner and outer rust layers on the Ni–Cr steel bar, the inner layer being dense and bonded to the steel substrate. The α -FeO(OH)/γ -FeO(OH) ratio of the rust layer on the Ni–Cr steel bar is greater, which contributes to a more denser rust layer enhancing corrosion resistance.

中文翻译：

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镍铬钢棒在海洋大气中的耐腐蚀性能

使用交替浸入腐蚀试验和电化学技术比较了 Ni-Cr 和 20MnSi 钢棒在模拟海洋环境中的腐蚀行为。使用扫描电子显微镜 (SEM) 和 X 射线衍射 (XRD) 表征微观结构特征。电化学测量和交替浸入腐蚀测试表明，Ni-Cr 钢棒具有更高的正电位 (– 0.397 V)、更低的腐蚀电流密度 (28.19 μA/cm2) 和更好的耐腐蚀性，腐蚀速率为 3.81 g/ (m2·h) 和腐蚀深度为 4.27 mm/g。镍铬钢棒上有内外锈层，内层致密并与钢基体结合。Ni-Cr钢棒上锈层的α-FeO​​(OH)/γ-FeO(OH)比值越大，