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采用常规腐蚀试验、电化学和表面分析等方法,评价了 Cu 对 Ni-Cr-Mo 耐蚀合金在沸腾温度下的50%H_2SO_4+42g/1Fe_2(SO_4)8、10%HCl 酸和40%HF 酸中耐蚀性的影响。结果指出,加入微量 Cu 不仅显著提高 Ni-Cr-Mo 合金在沸腾40%HF 酸中的耐蚀性(约100倍),而且保留了此合金的原有耐蚀特点。Cu 对合金电化学行为的影响以及经腐蚀后合金表面层成份的变化,均说明 Cu 的良好作用在于使合金在 HF 酸中生成富 Cu 层进而改变了电化学行为,并非是对合金组织结构产生影响的结果。
The effects of Cu on the corrosion resistance of Ni-Cr-Mo corrosion-resistant alloys at 50% H 2 SO 4 + 42g / 1Fe 2 (SO 4) 8, 10% HCl and 40% HF at the boiling temperature were evaluated by conventional corrosion tests, electrochemical and surface analysis methods Effect of acid corrosion resistance. The results show that addition of trace Cu not only significantly improves the corrosion resistance (about 100 times) of Ni-Cr-Mo alloy in boiling 40% HF acid, but also retains the original corrosion resistance of this alloy. The effect of Cu on the electrochemical behavior of the alloy and the change of the surface composition of the alloy after corrosion all indicate that the good effect of Cu is to make the alloy generate the Cu-rich layer in the HF acid and change the electrochemical behavior instead of generating the alloy structure Effect of the result.