预充氢对Ni-Cr合金在高温高压水中腐蚀行为影响  

Effect of Pre-charging Hydrogen on Corrosion Behavior of Ni-Cr Alloy in High Temperature and High Pressure Water

作　　者：白钲清 农靖 韦世宸 徐健 BAI Zhengqing;NONG Jing;WEI Shichen;XU Jian(School of Materials,Sun Yat-Sen University,Shenzhen 518107,China)

机构地区：[1]中山大学材料学院,深圳518107

出　　处：《中国腐蚀与防护学报》2025年第2期338-346,共9页Journal of Chinese Society For Corrosion and Protection

基　　金：深圳市高等学校稳定资助面上项目(2022A007);国家自然科学基金(52001336)。

摘　　要：采用扫描电镜、Raman光谱仪和透射电子显微镜分析了4种Cr含量的Ni-Cr合金在290℃/9 MPa高温高压水环境中浸泡720 h后其表面氧化膜的微观形貌及成分。结果表明:有无预充氢试样表面均形成了不同结构的富Cr氧化膜,相比于未预充氢试样,预充氢后试样不论外层还是内层腐蚀产物厚度都显著增加,表明预充氢可以显著加速材料在高温水中的氧化速率;随着试样中Cr含量增加,无预充氢材料表面会形成更致密的富Cr氧化层保护基体,但在预充氢影响下随着Cr含量增加,材料内层中出现显著孔洞,降低了氧化膜的保护性。Four model Ni-Cr alloys with varying chromium content were pre-charged with hydrogen.Then their oxidation behavior was assessed in a high-temperature,high-pressure water(290℃/9 MPa)for 720 h via scanning electron microscopy(SEM),Raman spectroscopy,and transmission electron microscopy(TEM).The results revealed that Cr-rich oxide scales of different structures were formed on both the hydrogen-charged and uncharged alloys.Notably,the thickness of oxide scales on the hydrogen charged alloys increased significantly compared to that on the uncharged ones,indicating that pre-hydrogen charging could accelerate the oxidation rate of the alloy in high-temperature high-pressure water.Moreover,as the Cr content increased,a denser Cr-rich oxide scale could form for the uncharged alloys,enhancing its protectiveness.However,under the influence of hydrogen pre-charging,selective dissolution of Ni-containing oxides occurred in the inner portion,leading to substantial voids beneath oxide scale and diminishing the protective capability of the oxidation scale.

关 键 词：NI-CR合金 高温高压水 腐蚀产物 预充氢 

分 类 号：TG174[金属学及工艺—金属表面处理]