(中國石油大學(xué) (北京) 理學(xué)院，北京 102249)
摘 要: 利用美國Cortest公司高溫高壓反應(yīng)釜模擬H2S/CO2及元素S共存環(huán)境，在流動高礦化度飽和H2S/CO2介質(zhì)中進(jìn)行試驗(yàn)，然后利用SEM、EDS及XPS等表面分析技術(shù)，探討元素S對鎳基合金G3高溫高壓H2S/CO2腐蝕行為的影響。結(jié)果表明：在元素S含量為0、1及10 g/L時，鎳基合金G3的平均腐蝕速率變化不大，鈍化膜厚度約為11 nm，其結(jié)構(gòu)呈雙極性，外層以Cr、Ni的氫氧化物、氧化物為主，內(nèi)層以Cr、Ni的氧化物為主；當(dāng)元素S含量增大到100 g/L時，腐蝕速率急劇增大，鈍化膜厚度也迅速增大到約90 nm，且結(jié)構(gòu)轉(zhuǎn)變?yōu)橥鈱右訡r、Ni的硫化物為主，內(nèi)層以Cr、Ni的氧化物為主；鈍化膜結(jié)構(gòu)的轉(zhuǎn)變可能是導(dǎo)致鎳基合金G3耐蝕性能降低的最主要原因。
關(guān)鍵字: 鎳基合金；高溫高壓；元素S；H2S/CO2；XPS
（College of Science, China Petroleum University, Beijing 102249, China）
Abstract:The solution immersion environments containing H2S/CO2 and element S were simulated in a high temperature and high pressure autoclave. The effect of element S on the corrosion behavior of nickel-base alloy G3 was analyzed and discussed by the following technologies, such as SEM, EDS and XPS. The results show that the average corrosion rate of nickel-base G3 changes lightly and the thickness of passive film with bipolar structure is about 11 nm under the element S contents of 0, 1 and 10 g/L. The out layer of passive film is mainly composed of oxides and hydroxides and the inner layer is mainly oxides. However, when the content of element S reaches 100 g/L, the average corrosion rate of nickel-base G3 increases rapidly, and the thickness of passive film also increases to about 90 nm. The out layer changes greatly and is mainly composed of Cr and Ni sulfide, the inner layer is still mainly Cr and Ni oxides. The transformation of passive film structure maybe is the main reason that results in the lower corrosion resistance of nickel-base G3.
Key words: nickel-base alloy; high temperature and high pressure; element S; H2S/CO2; XPs
