中文摘要：

3Cr 管道钢的焊接关节与电线使用的商业焊接被制作煤气的钨弧焊(GTAW ) 技术。Potentiodynamic 极化曲线，线性极化抵抗(LPR ) ，电气化学的阻抗光谱学(EIS ) ，扫描电子显微镜学(SEM ) ，和精力散的 spectrometry (版本) 被用来在焊接地区(WZ ) 上调查腐蚀抵抗和一部腐蚀电影的生长。在这部电影的电气化学的特征的变化通过 EIS 数据适合被获得。结果证明平均腐蚀在公司 WZ 评价 < 潜水艇 class= “ a-plus-plus ” > 2 环境首先逐渐地增加了，然后波动，并且最后减少了。WZ 上的电影的形成被划分成三个阶段：动态吸附，不完全范围的层形成，和不可分的层形成。

英文摘要：

The welded joints of 3Cr pipeline steel were fabricated with commercial welding wire using the gas tungsten arc welding （GTAW） technique. Potentiodynamic polarization curves, linear polarization resistance （LPR）, electrochemical impedance spectroscopy （EIS）, scan- ning electron microscopy （SEM）, and energy-dispersive spectrometry （EDS） were used to investigate the corrosion resistance and the growth of a corrosion film on the weld zone （WZ）. The changes in electrochemical characteristics of the film were obtained through fitting of the EIS data. The results showed that the average corrosion rate of the WZ in CO2 environments first increased, then fluctuated, and finally de- creased gradually. The formation of the film on the WZ was divided into three stages： dynamic adsorption, incomplete-coverage layer forma- tion, and integral layer formation.