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1. 发明授权

US4190502A Method of evaluating the corrosion rate of metal 失效
标题翻译：评估金属腐蚀速率的方法
公开(公告)号：US4190502A
公开(公告)日：1980-02-26
申请号：US950051
申请日：1978-10-10
申请人： Ken-ichi Kanno , Masayuki Suzuki , Yuichi Sato , Masamichi Machida
发明人： Ken-ichi Kanno , Masayuki Suzuki , Yuichi Sato , Masamichi Machida
IPC分类号： G01N27/26 , G01N17/00 , G01N17/02 , G01N27/46 , G01N27/30
CPC分类号： G01N17/02
摘要： A metal test piece is disposed in a cell filled with a test solution. The metal test piece is electrically charged instantaneously through a counter electrode so as to have a few millivolts polarization potential .eta..sub.t. The charge consumed by the corrosion reaction of the test piece is measured by a potential recorder in the form of a variation of the polarization potential .eta..sub.t with respect to time t. The measured (.eta..sub.t -t) relation is analyzed to obtain a polarization resistance R.sub.P of the metal test piece. After the potential of the metal test piece returns to its natural potential Ecorr, the test piece is charged again until its polarization potential .eta..sub.t rises to 50 millivolts or more, and the (.eta..sub.t -t) relation is measured in the same way as mentioned above. Based on this relation, the Tafel slope .beta..sub.a of the anodic reaction is obtained. After the potential of the metal test piece has returned to its natural potential Ecorr, the test piece is so charged for the third time as to have its polarization potential .eta..sub.t lowered to -50 millivolts or less, and the (.eta..sub.t -t) relation is measured. This relation is analyzed to obtain the Tafel slope .beta..sub.c of the cathodic reaction. Based on the polarization resistance R.sub.P, Tafel slopes .beta..sub.a and .beta..sub.c, the corrosion current density I.sub.corr is obtained, from which the corrosion rate V is calculated.
摘要翻译：将金属试片放置在填充有测试溶液的电池中。金属试片瞬间通过对电极进行充电，从而具有几毫伏的极化电位等。试验片的腐蚀反应所消耗的电荷用潜在的记录仪以相对于时间t的偏振电位等的变化的形式来测量。分析测得的（eta t-t）关系，得到金属试片的极化电阻RP。在金属试片的电位恢复到其自然电位Ecorr之后，再次对试片进行充电，直到其极化电位升至50毫伏以上，并且以与上述相同的方式测量（等）关系）。基于这种关系，获得了阳极反应的Tafel斜率βa。在金属试片的电位恢复到其自然电位Ecorr之后，试样第三次如此充电以使其极化电位等于或低于-50毫伏，（eta tt）关系为测量。分析该关系以获得阴极反应的Tafel斜率βc。基于极化电阻RP，Tafel斜率βa和βc，得到腐蚀电流密度Icorr，从中计算腐蚀速率V.

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