Corrosion behavior of Cu–P–Cr–Ni weathering steels with different nickel contents was studied by periodic immersion corrosion test for 72 h. The mass loss method was used to evaluate the weatherability of weathering steel. The rust layers formed on weathering steel were characterized by scanning electron microscopy, X-ray diffraction, electron probe microanalysis, X-ray photoelectron spectroscopy, and electrochemical measurements. The results of periodic immersion corrosion test for 72 h showed that the mass loss rates of Cu–P–Cr–0.14Ni steel and Cu–P–Cr–0.04Ni steel were 1.57 and 1.61 g/(m² h), respectively. According to the electrochemical experiment, the corrosion potentials of the two tested steels at the initial stage of corrosion were − 0.6852 and − 0.7037 V, respectively. With the corrosion time reaching 72 h, the corrosion potential difference between the two tested steels was gradually reduced. In the initial stage, NiO was formed in the rust layer and can dramatically promote the crystallization of corrosion products to improve the stability of the rust layer. After periodic immersion corrosion test for 72 h, Ni element had no obvious effect. At this time, it was mainly the enrichment of Cu and Cr elements in the form of CuO and Cr₂O₃ in the rust layer that could further protect the matrix.

通过72 h的周期性浸没腐蚀试验研究了不同镍含量的Cu-P-Cr-Ni耐候钢的腐蚀行为。质量损失法用于评价耐候钢的耐候性。通过扫描电子显微镜、X 射线衍射、电子探针显微分析、X 射线光电子能谱和电化学测量对耐候钢上形成的锈层进行了表征。72 h的周期性浸没腐蚀试验结果表明，Cu-P-Cr-0.14Ni钢和Cu-P-Cr-0.04Ni钢的质量损失率分别为1.57和1.61 g/(m ²h)，分别。根据电化学实验，两种被试钢在腐蚀初期的腐蚀电位分别为-0.6852和-0.7037 V。随着腐蚀时间达到72 h，两种试验钢之间的腐蚀电位差逐渐减小。初期，NiO在锈层中形成，能显着促进腐蚀产物的结晶，提高锈层的稳定性。经过72 h的周期性浸没腐蚀试验，Ni元素无明显效果。此时主要是Cu和Cr元素以CuO和Cr ₂ O ₃形式富集在锈层中，可以进一步保护基体。