THE STUDY OF CORROSION TESTS IN HOT ALKALINE SOLUTION

J Chin Soc Corr Pro

2003, Vol. 23

Issue (2): 116-119 DOI:

Research Report

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THE STUDY OF CORROSION TESTS IN HOT ALKALINE SOLUTION

Junquan Liu;Xiaohui Tu;Wei Li;Jianting Qi

华南理工大学工业装备与控制工程系

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Junquan Liu; Xiaohui Tu; Wei Li; Jianting Qi. THE STUDY OF CORROSION TESTS IN HOT ALKALINE SOLUTION. J Chin Soc Corr Pro, 2003, 23(2): 116-119 .

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Abstract The corrosion behavior of two types of cast iron,Cr 13 and Cr26 in hot alkaline solution was measured by weight loss and electrochem ical methods.Potential-time curves showed that potential changes from higher to lower then to higher in the medium while potentials of the two materials were di fferent in each period.In the first period,high potential lasted several minutes for Cr13 and about 10 hours for Cr26.The corrosion rates deduced by polarizatio n curves were instantaneous(at some point for Cr13 in lower potential period and for Cr26 in the first higher potential period)and were quite diff erent from the results by weight loss method.In the range far from potential of evolving hydrogen the rates deduced by combination of cathode polarization curve of Au and potential-time curves were twice as great as those deduced by weight loss method.So the former could take place of the latter with a coefficient of a bout 2.Near the potential of evolving hydrogen the difference of resul ts by two methods was remarkable,which may be considered as the result of the hydrogen overpotential on Au lower than that on the cast irons.

Key words: corrosion test weight loss polarization curve cast iro n hot alkaline

Received: 24 February 2002

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