Corrosion Mechanism of Alloy 800 in Acidic Solution Containing Thiosulfate and Chloride Ions

被引：4
|
作者：
Xia D. [1 ]
Song Y. [1 ]
Song S. [1 ]
Wu S. [1 ]
Ma C. [1 ]
机构：
[1] Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin
来源：
| 2018年 / Tianjin University卷 / 51期
关键词：
Alloy; 800; Chloride ion; Nuclear steam generator; Passive film; Sodium thiosulfate;
D O I：
10.11784/tdxbz201711023
中图分类号：
学科分类号：
摘要：
Polarization curves,combined with electrochemical noise(EN),3D microscopy,were used to study the corrosion behavior of Alloy 800 in simulated crevice water chemistry,and the effect of the concentration of thiosulfate in acidic solution containing chloride ions on corrosion resistance was analyzed.The results show that the surface of Alloy 800 is activated and dissolved in the acidic solution containing chloride and thiosulfate ions,and the corrosion rate is fast.In the acidic environment,the trace amount of reduced thiosulfate ion has no significant effect on the corrosion of the Alloy 800 in the solution containing chloride ion.With the increase of the concentration of thiosulfate ion,the polarization curve is shifted to the negative direction.And under the same potential conditions,the anode current density increases significantly.EN results show that the noise resistance is reduced by two orders of magnitude,and the current standard deviation is increased by two orders of magnitude after adding 0.075 mol/L thiosulfate ion to the acidic solution containing chloride ion.This mainly due to the addition of thiosulfate ion to accelerate the process of alloy anode corrosion. © 2018, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.
引用
收藏
页码：591 / 597
页数：6
相关论文
共 22 条
  • [1] Xia D.H., Luo J.L., Corrosion behavior of Alloy 690 in simulated alkaline water chemistries containing sulfur at 300 °C, Acta Phys-Chim Sin, 3, pp. 467-475, (2015)
  • [2] Staehle R.W., Gorman J.A., Quantitative assessment of submodes of stress corrosion cracking on the secondary side of steam generator tubing in pressurized water reactors: Part 1, Corrosion, 59, 11, pp. 931-994, (2003)
  • [3] Liu Z., Zhai L., Zhang Z., The material and structure of the steam generator for heat exchanger and support plate, CFHI Technology, 3, pp. 22-25, (2015)
  • [4] Shen C., Xia D., Fan H., Et al., Passivation degradation of Alloy 800 in boiling solution containing thiosulphate, Electrochim Acta, 233, pp. 13-25, (2017)
  • [5] Zhang W., Carcea A.G., Newman R.C., Pitting of steam-generator tubing alloys in solutions containing thiosulfate and sulfate or chloride, Faraday Discussions, 180, pp. 233-249, (2015)
  • [6] Gao Z.M., Wang C., Miao W.H., Et al., Characterization of a stressed passive film using scanning electrochemical microscope and point defect model, Transactions of the Indian Institute of Metals, 70, 5, pp. 1-11, (2017)
  • [7] Lu B.T., Tian L.P., Zhu R.K., Et al., Effects of dissolved Ca<sup>2+</sup>, and Mg<sup>2+</sup>, on passivity of UNS N08800 alloy in simulated crevice chemistries with and without Pb contamination at 300, ℃, Corrosion Science, 100, pp. 1-11, (2015)
  • [8] Roberge R., Effect of the nickel content in the pitting of stainless steels in low chloride and thiosulfate solutions, Corrosion, 44, 5, pp. 274-280, (1988)
  • [9] Xia D.H., Luo J.L., Gao Z.M., Et al., Monitoring the diffusion layer during passive film breakdown on Alloy 800 with digital holog-raphy, Acta Metall Sin(Engl Lett), 28, 9, pp. 1170-1174, (2015)
  • [10] Xia D.H., Zhu R.K., Behnamian Y., Et al., pH effect on sulfur-induced passivity degradation of Alloy 800 in simulated crevice chemistries, Journal of the Electrochemical Society, 161, 4, (2014)
123