通过电化学阻抗谱和动电位扫描法研究X65管线钢在含氧氯化钠溶液中沉积物对电化学参数的影响。采用电阻法（ER）结合零电阻电流计（ZRA ）研究X65钢在沉积物覆盖下的电偶腐蚀行为与不同浓度有机膦缓蚀剂的作用效果。结果表明：X65钢在SiO2沉积物覆盖时腐蚀电位负移，腐蚀速率降低。当有沉积物覆盖与无沉积物覆盖的电偶试片相连时，X65钢在沉积物下发生阳极极化，阳极电偶电流密度在18h内由120μA／cm2衰减到50μA／cm2并保持稳定。依次加入5×10－5，8×10－5和3×10－4浓度的 PB T C A后，电偶电流在最高升至1300μA／cm2后逐渐下降并稳定在610μA／cm2附近，沉积物下X65钢腐蚀速率达到6．11mm／a ，PBTCA加速了X65钢在含氧溶液中沉积物下的腐蚀。通过对试片表面进行观察，沉积物下X65钢表面发生了严重的局部腐蚀。
Effect of the deposit on the electrochemical parameters of X 65 pipeline steel in oxygen con‐tained sodium chloride solution was studied by EIS and PDS methods .The galvanic corrosion behavior under deposit and effect of different concentration of corrosion inhibitor PBTCA were studied by elec‐trical resistance (ER) method combined with ZRA .The results show that the corrosion potential of X65 steel shifts negatively as SiO2 covering its surface and the corrosion rate becomes lower .When the galvanic couple specimen with deposit is electrically connected with the specimen without deposit , anodic polarization occurs on X65 steel under deposit and the galvanic current density decreases from 120μA/cm2 to 50μA/cm2 and keeps stable .As 5 × 10-5 ,8 × 10-5 and 3 × 10-4 PBTCA were introduced into the solution ,the galvanic current density reaches the highest 1300μA/cm2 and then decreases to 610μA/cm2 keeping stable around 610μA/cm2 , corrosion rate of X65 steel under deposit reaches 6.11mm/a .PBTCA accelerates the corrosion of X65 steel under deposit in oxygen contained solution . Through the investigation on the surface of the specimens ,serious local corrosion occurs on the X65 steel surface under deposit .
参考文献
| [1] | 高秋英;张江江;杨祖国;羊东明;刘冀宁;臧晗宇;朱原原;张涛.20#碳钢管道内沉积物对腐蚀行为的影响[J].科技导报,2014(24):35-39. |
| [2] | Role of a clay sediment deposit on the corrosion of carbon steel in 0.5 mol L~(-1) NaCl solutions[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,20106(6):p.2026. |
| [3] | Zhang, G. A.;Yu, N.;Yang, L. Y.;Guo, X. P..Galvanic corrosion behavior of deposit-covered and uncovered carbon steel[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2014Sep.(Sep.):202-212. |
| [4] | 李斌;张耀亨;胥聪敏.X80管线钢在延安地区水饱和土壤中的电化学腐蚀行为[J].机械工程材料,2010(10):65-67,86. |
| [5] | 贾恒磊;赵春平;汪浩;姜姝;费雪松.管线的氧浓差电池现象[J].管道技术与设备,2012(3):51-52. |
| [6] | 程海鹏;王东江.氧浓差电池在油井的腐蚀机理[J].石油化工腐蚀与防护,2014(1):46-49. |
| [7] | Ya-Chiao Chang;Richard Woollam;Mark E. Orazem.Mathematical Models for Under-Deposit Corrosion I. Aerated Media[J].Journal of the Electrochemical Society,20146(6):C321-C329. |
| [8] | 黄金营;魏慧芳;只金芳.TGB沉积膜下腐蚀的抑制机理研究[J].腐蚀科学与防护技术,2008(1):19-21. |
| [9] | Vedapriya Pandarinathan;Katerina Lepkova;Stuart I. Bailey;Rolf Gubner.Evaluation of corrosion inhibition at sand-deposited carbon steel in CO_2-saturated brine[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2013Jul.(Jul.):108-117. |
| [10] | Yongjun Tan;Young Fwu;Kriti Bhardwaj.Electrochemical evaluation of under-deposit corrosion and its inhibition using the wire beam electrode method[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,20114(4):1254-1261. |
| [11] | 张学元;邸超;陈卓元;王凤平;杜元龙.LN209井油管沉积物下方腐蚀行为[J].腐蚀科学与防护技术,1999(5):279-283. |
| [12] | 胥聪敏;杨东平;张灵芝;史立强;李辉辉.SRB对X100钢在鹰潭土壤模拟溶液中腐蚀行为的影响[J].材料工程,2015(6):71-78. |
| [13] | Huang Y;Ji DW.Experimental study on seawater-pipeline internal corrosion monitoring system[J].Sensors and Actuators, B. Chemical,20081(1):375-380. |
| [14] | M. Kouril;T. Prosek;B. Scheffel;F. Dubois.High sensitivity electrical resistance sensors for indoor corrosion monitoring[J].Corrosion Engineering, Science and Technology,20134(4):282-287. |
| [15] | Wu, J. W.;Bai, D.;Baker, A. P.;Li, Z. -H.;Liu, X. -B..Electrochemical techniques correlation study of on-line corrosion monitoring probes[J].Materials and Corrosion,20152(2):143-151. |
| [16] | A. Legat.Monitoring of steel corrosion in concrete by electrode arrays and electrical resistance probes[J].Electrochimica Acta,200727(27):7590-7598. |
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