THE FORMATION OF PRODUCT SCALE AND MASSTRANSFER CHANNELS DURING CO2 CORROSION

J Chin Soc Corr Pro

2002, Vol. 22

Issue (6): 363-366 DOI:

Research Report

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THE FORMATION OF PRODUCT SCALE AND MASSTRANSFER CHANNELS DURING CO2 CORROSION

Guoxian Zhao;Changfeng Chen;MinXV Lu

中国石油天然气集团公司管材研究所

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Guoxian Zhao; Changfeng Chen; MinXV Lu. THE FORMATION OF PRODUCT SCALE AND MASSTRANSFER CHANNELS DURING CO2 CORROSION. J Chin Soc Corr Pro, 2002, 22(6): 363-366 .

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Abstract Formation of corrosion product scale and mass trans fe r channels in the scale during CO2 corrosion have been studied by means of SEM .Three layers of FeCO3 scale have different composition and structure.Many cha nnels are found inside the layers,which makes the corrosive medium reach the sur face of the metal.The reasons for forming the channel include FeCO3 itself unp erfect,dissolution of the scale in the corrosive medium,cracking of the scale re sulting from stress inside it,etc.All these result in the severe local corrosion of the metal.

Key words: CO2 corrosion dissolution crack corrosion product la yers

Received: 13 July 2001

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