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采用Ａｇ／ＡｇＣｌ微电极研究了２０钢和１６Ｍｎ钢中各微区相在１ｍｏｌ／ＬＮａＮＯ３溶液中的电化学行为。结果表明：铁素体相、珠光体相及二者混合相的电位符合混合电位理论，以珠光体相零电流电位最负，腐蚀电流密度最大；铁素体相零电流电位最正，腐蚀电流密度最小；二者混合相居中。对混合相的腐蚀过程在长焦距显微镜下进行了原位观察，发现珠光体相优先腐蚀，铁素体相腐蚀较轻。
Ag / AgCl microelectrodes were used to study the electrochemical behavior of each micro-phase in 20 mol and 16Mn steel in 1 mol / L NaNO3 solution. The results show that the potentials of ferrite phase, pearlite phase and their mixed phases are in accordance with the mixed potential theory. The phase current of pearlite is the lowest and the corrosion current density is the highest. The ferrite phase zero current potential is the most positive and the corrosion current The density of the smallest; both mixed with each other. Corrosion of the mixed phase was observed in situ under a long focal length microscope and found that the pearlite phase preferentially corrodes and the ferrite phase corrodes less.