基于理论分析和电化学测量技术研究了温度对破损涂层S135钻杆钢在3.5％(质量分数,下同)KCl溶液中电化学腐蚀行为的影响.结果表明:破损涂层钻杆钢的开路电位随温度升高而负移,在40～65℃温度区间,材料热力学状态发生显著变化;整个反应主要受阳极反应控制,腐蚀速率随温度升高先增大后减小,在65℃时达到最大;温度主要通过影响离子传递电荷过程来影响反应的腐蚀速率.
Based on theoretical analysis and electrochemical measurement techniques,the effect of temperature on electrochemical corrosion behavior of S135 drill steel with disbonded coating in 3.5％ KCl solution was studied.The results indicated that the open circuit potential of drill steel with disbonded coating shifted towards negative direction with the increase of temperature;the thermodynamic state of the material significantly changed in the range of 40-65 ℃ and the overall reaction was mainly controlled by the anodic reaction,with the increase of temperature,the reaction rate increased firstly and decreased sequently,reached a maximum at 65 ℃.The temperature mainly influenced the ionic charge transfer reaction processes and thus influenced the corrosion rate.
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