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模拟闭塞腐蚀电池的发生过程,研究了OCr 18Ni 9Ti奥氏体不锈钢在pH=6.86的3％ NaCl溶液中,在承受一定拉应力的情况下,闭区内试样段电位和介质pH值随闭区外试样段极化电位变化的规律。结果表明:不论闭区外试样段阳极极化电位值的高还是低,闭区内试样段的电位均落在试样自腐蚀电位范围内,闭区内介质pH=2.5—3.0。当闭区外试样段阴极极化时,闭区内试样段电位接近外部试样的极化电位值,但一般要正十几毫伏到几十毫伏,闭区内介质的pH值都随着闭区外试样段极化电位的负移而上升。
The process of occluding the corrosion cell was simulated. In the case of 3% NaCl solution with pH = 6.86, the tensile strength of OCr 18Ni 9Ti austenitic stainless steel was investigated. The variation of polarization potential outside the sample zone. The results show that the potentials of the samples in the closed zone fall within the range of self-corrosion potential of the sample, regardless of whether the anodic polarization potential of the sample outside the closed zone is high or low. The pH of the closed medium is 2.5-3.0. When the cathodic polarization of the specimen outside the closed zone, the potential of the specimen in the closed zone is close to that of the external specimen, but generally it is more than ten millivolts to several tens of millivolts, the pH of the medium in the closed zone All increased with the negative shift of the polarization potential of the samples outside the closed zone.