温度对破损涂层S135钻杆钢在3.5% KCl溶液中电化学腐蚀行为的影响

Effect of Temperature on Electrochemical Corrosion Behavior of S135 Drill Steel with Disbonded Coating in 3.5% KCl Solution

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）KCI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 ettect ot 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.