【摘要】：為了解決在深海油氣鉆采中出現(xiàn)的酸性環(huán)境中對鉆采設備的腐蝕問題,結合海洋中油氣田的實際環(huán)境,在pH值為3的Na2SO4+H2SO4溶液中,采用電化學極化曲線、循環(huán)極化曲線、電化學阻抗譜(EIS)結合靜態(tài)浸泡實驗,分別研究了Cl-質量分數(shù)(1%、3.5%和7%)和溶液溫度(4、25、50和80℃)對馬氏體沉淀硬化不銹鋼PH13-8Mo電化學腐蝕行為的影響,并采用點缺陷PDM模型結合閉塞電池理論對其腐蝕機理進行了分析.結果表明,隨著溶液中Cl-濃度的升高,PH13-8Mo極化曲線中二次鈍化的特性消失.溶液中Cl-濃度和溫度的升高均使得PH13-8Mo的點蝕電位降低、點蝕保護電位降低,抗點蝕能力下降,腐蝕電流密度增大,鈍化電位區(qū)間縮短,電荷轉移電阻呈指數(shù)關系下降,樣品表面腐蝕形貌由點蝕發(fā)展為全面腐蝕.
[Abstract]:In order to solve the corrosion problem of drilling and production equipment in acidic environment in deep-sea oil and gas drilling and production, combining with the actual environment of oil and gas fields in the ocean, electrochemical polarization curve and cyclic polarization curve are used in Na2SO4 H2SO4 solution with pH value of 3. Electrochemical impedance spectroscopy (EIS) combined with static immersion test was used to study the effects of Cl- mass fraction (1% and 7%) and solution temperature (4? 25% and 80 鈩，

本文編號：2336708