【摘要】 316L不锈钢广泛用于石油化工领域集输管线、部件等。在含酸性油气的开采过程中，316L不锈钢除了面临着高温高压环境外，还会因电化学腐蚀析氢反应而导致氢损伤。为进一步提升其耐蚀和力学性能，在316L不锈钢表面进行了激光喷丸强化，并通过浸泡实验和原位电化学测试，探究温度与CO₂对预充氢316L不锈钢氢损伤行为的影响。结果表明，激光喷丸使316L不锈钢晶粒尺寸细化18.9%，小角度晶界比例提升88.1%；在高温高压环境中，316L不锈钢钝化电流密度随温度和CO₂分压升高而增大，说明电化学稳定性下降、抗氢损伤能力减弱，且温度通过影响CO₂溶解度提高氢损伤敏感性；氢渗透引发氧化膜开裂，为CO₂和Cl^-提供侵蚀通道，温度和压力加快腐蚀反应与传质，CO₂与Cl^-侵蚀导致钝化膜溶解，最终保护性钝化膜Fe₂O₃和Cr₂O₃消耗，进一步加速氢损伤。更多还原

【Abstract】 316L stainless steel is widely used in gathering pipelines and components in the petrochemical field. During the exploitation of acid oil and gas,316L stainless steel not only faces high-temperature and high-pressure environments but also suffers from hydrogen damage caused by hydrogen evolution reactions from electrochemical corrosion. To further improve its corrosion resistance and mechanical properties,laser peening strengthening was performed on the surface of 316L stainless steel. Immersion experiments and in-situ electrochemical tests were conducted to investigate the effects of temperature and CO₂ on pre-charged hydrogen 316L stainless steel. The results show that laser shock peening refines the grain size of 316L stainless steel by 18. 9% and increases the proportion of low-angle grain boundaries by 88. 1%. In hightemperature and high-pressure environments,the passivation current density of 316L stainless steel increases with the rise of temperature and CO₂ partial pressure,indicating decreased electrochemical stability and weakened hydrogen damage resistance. Additionally,temperature increases the sensitivity of hydrogen damage by affecting CO₂ solubility. Hydrogen permeation causes cracking of the oxide film,providing an erosion channel for CO₂ and Cl^-. Temperature and pressure accelerate the corrosion reaction and mass transfer. The erosion of CO₂ and Cl^-leads to the dissolution of the passive film,ultimately resulting in the depletion of the protective passive film components Fe₂O₃ and Cr₂O₃,which further accelerates hydrogen damage.更多还原