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对Ni Cu低合金钢在模拟深层地下水环境,即除氧0.1 mol/L Na HCO3+0.1 mol/L Na Cl溶液中,原位监测其在长时间浸泡条件下的开路电位变化曲线及阻抗谱的演化,研究电极表面的腐蚀演化规律,并与相同条件下低碳钢的腐蚀行为进行比较.结果表明,Ni Cu低合金钢在本实验溶液中的耐蚀性要显著优于低碳钢,尤其是其耐局部腐蚀的能力更优.合金元素Ni富集在内锈层中,可能以Ni Fe2O4的形式存在,而合金元素Cu的富集不明显,可能的存在形式为Cu Fe O2.
The in-situ potentiometric curves and impedance spectra of Ni Cu low alloy steels in simulated deep groundwater environment, namely 0.1 mol / L Na HCO3 + 0.1 mol / L NaCl solution, were measured in situ The evolution of corrosion on the electrode surface was studied and compared with that of the mild steel under the same conditions.The results showed that the corrosion resistance of the Ni Cu low alloy steel in this experimental solution was significantly better than that of the mild steel, Is more resistant to localized corrosion.The alloying element Ni enriched in the inner rust layer may exist in the form of Ni Fe2O4, while the alloying element Cu enrichment is not obvious, the possible existence form is Cu Fe O2.