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通过失重法和电化学方法考察了含10%O_2、40%CO_2和10%O_2+40%CO_2的3.5%NaCl溶液中G105钢的腐蚀行为,分析了腐蚀介质温度对G105钢腐蚀行为的影响。结果表明,单独通入CO_2气体条件下G105钢的腐蚀速率要大于单独通入O_2气体条件下的腐蚀速率,且单独通入O_2和CO_2气体条件下的腐蚀速率之和要比混合通入O_2+CO_2条件下的腐蚀速率更大;在相同的腐蚀时间下,腐蚀电流密度从高至低的迅速依次为:10%O_2+40%CO_2>40%CO_2>10%O_2;在含有O_2的腐蚀介质中G105钢会加速腐蚀形成Fe OOH腐蚀产物,而在含有CO_2腐蚀介质中G105钢会加速腐蚀形成FeCO_3腐蚀产物,但是二者共同存在的条件下腐蚀介质中的O_2会中和部分氢离子,从而使得二者共存条件下的腐蚀速率小于二者单独存在条件下腐蚀速率之和。
The corrosion behavior of G105 steel in 3.5% NaCl solution containing 10% O_2, 40% CO_2 and 10% O_2 + 40% CO_2 was investigated by weight loss method and electrochemical method. The effect of corrosion medium temperature on the corrosion behavior of G105 steel was analyzed. The results show that the corrosion rate of G105 steel is higher than that of O 2 gas when CO 2 gas is fed in alone, and the corrosion rate of G105 steel is higher than that of O 2 + Under the same etching time, the corrosion current densities from high to low are as follows: 10% O 2 + 40% CO 2> 40% CO 2> 10% O 2; The G105 steel accelerates the corrosion and forms the Fe OOH corrosion product. However, the G105 steel accelerates the corrosion to form the FeCO 3 corrosion product in the medium containing CO 2, but the O 2 in the corrosion medium will neutralize some hydrogen ions under the coexistence of the two. So that the corrosion rate under the coexistence of the two is less than the sum of the corrosion rates under the existence of both.