外加拉應力對13Cr馬氏體不銹鋼的腐蝕行為影響

張慧娟; 趙密峰; 張雷; 馬磊; 王亞文; 岳小琪; 路民旭

doi:10.13374/j.issn2095-9389.2019.05.008

外加拉應力對13Cr馬氏體不銹鋼的腐蝕行為影響

doi: 10.13374/j.issn2095-9389.2019.05.008

1.
北京科技大學新材料技術研究院, 北京 100083
2.
中國石油塔里木油田公司, 庫爾勒 841000
3.
中車北京二七機車有限公司, 北京 100072

基金項目:

國家自然科學基金面上資助項目 51371034

國家科技重大專項資助項目 2016ZX05028-004-005

詳細信息

通訊作者:
張雷, E-mail: Zhanglei@ustb.edu.cn

中圖分類號: TG142.71
計量
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- 被引次數: 0
出版歷程
- 收稿日期: 2018-05-02
- 刊出日期: 2019-05-01

Effect of tensile stress on corrosion behavior of 13Cr martensitic stainless steel

1.
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2.
PetroChina Traim Oilfield Company, Korla 841000, China
3.
CRRC Beijing Locomotive Co., Ltd., Beijing 100072, China

More Information

Corresponding author: ZHANG Lei, E-mail: Zhanglei@ustb.edu.cn

摘要

摘要: 采用電化學測試手段(開路電位、交流阻抗譜及動電位極化曲線測試), 結合接觸角測試及體視顯微鏡微觀形貌觀察探究在80 g·L^-1 NaCl溶液中拉應力對L80-13Cr馬氏體不銹鋼鈍化膜溶解與再修復機制的影響.結果表明, 拉應力大小與L80-13Cr的鈍化特性存在正相關關系.隨著外加拉應力的增大, L80-13Cr馬氏體不銹鋼的開路電位負移, 電子轉移電阻減小, 線性極化電阻減小, 反應速率隨著拉應力的增大而增大.而L80-13Cr馬氏體不銹鋼在高電位下再鈍化形成的鈍化區會縮短, 自腐蝕電位降低, 維鈍電流密度增加.接觸角測試和體視顯微鏡微觀形貌觀察發現, 拉應力使得表面接觸角減小, 不銹鋼表面容易發生點蝕.外加拉應力使得L80-13Cr馬氏體不銹鋼的表面能增加, 促進鈍化膜的溶解, 并且抑制鈍化膜的再生, 導致材料耐蝕性降低.
- 13Cr不銹鋼 /
- 拉應力 /
- 鈍化特性 /
- 表面活性
Abstract: Tubes in deep wells are subjected to the mixed effects of the environment and stress and thus suffer many failures. Therefore, studying the corrosion of materials under stress deformation is necessary. This paper aims to investigate the effect of applied tensile stress on the dissolution of passive film and the repair mechanism of L80-13Cr martensitic stainless steel in solution of 80 g·L^-1 sodium chloride. Electrochemical tests were employed for measurements, where the main test measurements include open circuit potential (OCP), electrochemical impedance spectra (EIS), and potentiodynamic polarization tests. Contact angle measurement was combined with microscopic morphology analysis (Zoom stereo microscope) to investigate the surface activity. The test results show that there is the positive relation between applied tensile stress and the passivation characteristic of L80-13Cr martensitic stainless steel. Increase in the applied tensile stress negatively shifts the OCP value of L80-13Cr martensitic stainless steel, decreases the electron transfer resistance (R_t) and polarization resistance (R_p), and increases the rate of reaction; however, the passivation region significantly reduces, the passivation current density (E_corr) increases, and the self-corrosion current density decreases, which forms at a high potential. The results of contact angle test and microscopic morphology analysis show that the applied tensile stress reduces the surface contact angle and promotes the pitting of L80-13Cr martensitic stainless steel. Applied tensile stress can increase the surface energy of L80-13Cr martensitic stainless steel, promote the dissolution of the passivation film, and inhibit the regeneration of the passivation film; thus, it can deteriorate the corrosion resistance of materials.
- 13Cr stainless steel /
- tensile stress /
- passivation characteristic /
- surface activity

HTML全文

圖 1 實驗用L80-13Cr馬氏體不銹鋼金相組織

Figure 1. Metallographic image of the L80-13Cr stainless steel

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圖 2 實驗試樣示意圖(單位：mm)

Figure 2. Schematic of the test specimen (unit: mm)

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圖 3 恒載荷實驗裝置示意圖

Figure 3. Schematic of the constant-load experiment

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圖 4 不同拉應力下L80-13Cr不銹鋼的開路電位

Figure 4. OCP value of L80-13Cr stainless steel under various stresses

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圖 5 不同應力下L80-13Cr不銹鋼的阻抗Nyquist圖

Figure 5. Nyquist diagram of L80-13Cr stainless steel under various stresses

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圖 6 阻抗對應等效電路模型

Figure 6. Equivalent circuit used in the modeling of the EIS results

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圖 7 不同拉應力下L80-13Cr不銹鋼的動電位極化曲線

Figure 7. Potentiodynamic polarization curves of L80-13Cr stainless steel under various stresses

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圖 8 不同拉應力下L80-13Cr不銹鋼自腐蝕電位及線性極化電阻

Figure 8. E_corr and R_p of L80-13Cr stainless steel under various stresses

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圖 9 不同拉應力作用下試樣表面接觸角大小測試. (a) 0%σ_s; (b) 70%σ_s; (c) 110%σ_s

Figure 9. Contact angles of specimens under various stresses: (a) 0%σ_s; (b) 70%σ_s; (c) 110%σ_s

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圖 10 不同拉應力下試樣極化到0.3 V時的表面腐蝕形貌. (a) 0%σ_s; (b) 70%σ_s; (c) 110%σ_s

Figure 10. Surface morphology of specimen after potentiodynamic polarization at 0.3 V above the open circuit potential under various stresses: (a) 0%σ_s; (b) 70%σ_s; (c) 110%σ_s

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表 1 試驗材料化學成分(質量分數)

Table 1. Chemical composition of the experiment material ?%

C	Cr	Mn	Ni	Si	Cu	Mo	P	S	Fe
0.2	12.87	0.5	0.12	0.29	0.012	< 0.1	0.014	0.0026	余量

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表 2 阻抗圖譜參數擬合結果

Table 2. Parameters of EIS method

拉應力水平	R_s/(Ω·cm²)	Q_dl/(Ω^-1·cm^-2·s^-w)	參數，w	R_t/(Ω·cm²)
0%σ_s	5.43	3.5×10^-4	0.904	1947
70%σ_s	11.89	3.9×10^-4	0.860	925
110%σ_s	3.10	4.6×10^-4	0.919	643

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