【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(shè)備的腐蝕問題,結(jié)合海洋中油氣田的實(shí)際環(huán)境,在pH值為3的Na2SO4+H2SO4溶液中,采用電化學(xué)極化曲線、循環(huán)極化曲線、電化學(xué)阻抗譜(EIS)結(jié)合靜態(tài)浸泡實(shí)驗(yàn),分別研究了Cl-質(zhì)量分?jǐn)?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P(yáng)H13-8Mo電化學(xué)腐蝕行為的影響,并采用點(diǎn)缺陷PDM模型結(jié)合閉塞電池理論對其腐蝕機(jī)理進(jìn)行了分析.結(jié)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(diǎn)蝕電位降低、點(diǎn)蝕保護(hù)電位降低,抗點(diǎn)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(zhuǎn)移電阻呈指數(shù)關(guān)系下降,樣品表面腐蝕形貌由點(diǎn)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