The corrosion behavior of uncoated, nickel (Ni) and nickel–phosphorous (Ni–P)-coated AISI 430 alloy was investigated in Ar–3%H2 and Ar–3%H2–3%H2O atmosphere at 800 °C for 100 h. Microstructure, chemical composition, and reaction products were analyzed by scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction techniques. The corrosion extent of Ni–P-coated AISI 430 is higher than Ni-coated AISI 430. Oxidation promotes corrosion in the uncoated and coated alloy. The oxidation rate of Ni-coated alloy is the lowest in Ar–3%H2 but Ni–P-coated alloy in Ar–3%H2–3%H2O for initial 20 h. The oxidation rate of the Ni–P-coated sample is ~14 times higher in 20–100 h in Ar–3%H2–3%H2O. External growth of Cr2O3 is observed for Ni-coated alloy in Ar–3%H2 and for Ni–P-coated alloy in both the atmospheres. Inward growth of Cr2O3 by AISI 430 alloy consumption attributes to the lowest oxidation rate and the corrosion extent of Ni-coated sample in Ar–3%H2–3%H2O.

研究了在800° C的Ar–3％H 2和Ar–3％H 2 –3％H 2 O气氛中未涂覆，镍（Ni）和镍磷（Ni–P）涂覆的AISI 430合金的腐蚀行为。C持续100小时。通过扫描电子显微镜，能量分散光谱和X射线衍射技术分析了显微结构，化学成分和反应产物。Ni-P涂层的AISI 430的腐蚀程度高于Ni-P涂层的AISI430。氧化会促进未涂层和涂层合金的腐蚀。在Ar–3％H 2中，Ni涂层合金的氧化速率最低，而在Ar–3％H 2 –3％H 2中， Ni–P涂层合金的氧化速率最低。O在开始的20小时内。在Ar–3％H 2 –3％H 2 O中，Ni–P涂层样品的氧化速率在20–100小时内约高14倍。在Ni–P涂层合金中观察到Cr 2 O 3的外部生长。在两种气氛中，Ar-3％H 2以及用于Ni-P涂层的合金。AISI 430合金消耗对Cr 2 O 3的向内生长归因于Ar–3％H 2 –3％H 2 O中最低的氧化速率和镀镍样品的腐蚀程度。