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用动电势扫描和交流阻抗方法研究纯铁在0.05mol/l H_2SO_4+0.1mol/l NaNO_3和0.05mol/lH_2SO_4+0.1mol/l NaNO_3+0.01mol/l NaCl溶液体系中的电化学行为。讨论了在酸性介质中,在阳极钝化的电势范围内,NO_3~-可抑制Cl~-对Fe表面的孔蚀作用;当[NO_3~-]》[Cl~-]时,在上述电势范围内Fe表面呈钝化态。
The electrochemical behavior of pure iron in 0.05 mol / l H 2 SO 4 + 0.1 mol / l NaNO 3 and 0.05 mol / l H 2 SO 4 + 0.1 mol / l NaNO 3 + 0.01 mol / l NaCl solution was studied by potentiodynamic scanning and AC impedance method. It is discussed that NO_3 ~ can inhibit the corrosion of Cl ~ - on the surface of Fe in acid medium under the anodic passivation potential range. When [NO_3 ~ -] "[Cl ~ -], Fe surface passivation state.