CAJ | 학술논문

利用失重法、电化学测试、丝束电极和微观分析手段研究了在CO2饱和地层水中X65碳钢覆盖不同沉积物的腐蚀行为。结果显示，覆盖沙粒、黏土和碳酸亚铁可减轻X65钢的腐蚀，而覆盖硫化亚铁、元素硫和混合物则明显加速钢的腐蚀。尤其是覆盖元素硫，试样的腐蚀速率急剧增大。覆盖混合物试样的腐蚀速率也有显著的增大，混合物中元素硫起主导作用。试样表面沉积的元素硫可自催化阴极反应而大大加速钢的腐蚀。丝束电极的电位和电流分布显示，覆盖混合沉积物的电极，其电极电位比无沉积物覆盖电极的电极电位正。随着腐蚀进行，沉积物覆盖下电极发生严重的局部腐蚀。丝束电极的电位和电流分布图能够有效反映沉积物下局部环境变化而导致的局部腐蚀行为差异。
이용실중법、전화학측시、사속전겁화미관분석수단연구료재CO2포화지층수중X65탄강복개불동침적물적부식행위。결과현시，복개사립、점토화탄산아철가감경X65강적부식，이복개류화아철、원소류화혼합물칙명현가속강적부식。우기시복개원소류，시양적부식속솔급극증대。복개혼합물시양적부식속솔야유현저적증대，혼합물중원소류기주도작용。시양표면침적적원소류가자최화음겁반응이대대가속강적부식。사속전겁적전위화전류분포현시，복개혼합침적물적전겁，기전겁전위비무침적물복개전겁적전겁전위정。수착부식진행，침적물복개하전겁발생엄중적국부부식。사속전겁적전위화전류분포도능구유효반영침적물하국부배경변화이도치적국부부식행위차이。
The corrosion behavior of X65 carbon steel under different deposits in CO2 saturated formation water was studied by weight loss measurements, electrochemical measurements, wire beam electrode and microscopic analysis. The results show that the corrosion rate of the steel slightly decreases by being covered with sand, clay or ferrous carbonate. However, covered with ferrous sul-fide, elemental sulfur or mixture, the corrosion rate obviously accelerates, especially in the specimen covered with elemental sulfur. The corrosion rate of the specimen covered with mixture deposits also significantly increases, in which elemental sulfur plays a domi-nant role. The significant increase in corrosion rate of the specimen covered with elemental sulfur is attributed to the self-catalytic ac-tion of elemental sulfur on the cathodic reaction of steel corrosion. The current and potential distributions of wire beam electrodes indi-cate that the potentials of the electrodes covered with mixture deposits are more positive than those without deposits. During the corro-sion, severe localized corrosion occurs on the electrodes under mixture deposits. The current and potential maps of wire beam elec-trodes can effectively reflect the localized corrosion behavior of the steel under deposits due to the change of local environment.