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中国腐蚀与防护学报  2017, Vol. 37 Issue (2): 183-188    DOI: 10.11902/1005.4537.2016.135
  研究报告 本期目录 | 过刊浏览 |
静水压力对10CrNi3MoV钢腐蚀行为的影响
董赋,胡裕龙(),赵欣,王智峤
海军工程大学理学院 武汉 430033
Effect of Hydrostatic Pressure on Corrosion Behavior of 10CrNi3MoV Steel
Fu DONG,Yulong HU(),Xin ZHAO,Zhiqiao WANG
College of Science, Naval University of Engineering, Wuhan 430033, China
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摘要: 

采用高压下的静态挂片实验、腐蚀电位测定和电化学阻抗谱测定研究了静水压力及其交替变化对高强度船体结构钢10CrNi3MoV在3.5% (质量分数) NaCl 溶液中腐蚀行为的影响。结果表明:随着静水压力增大,溶液中溶解氧浓度降低,腐蚀产物中Fe2O3减少,腐蚀电位变负,从而使10CrNi3MoV钢的腐蚀速率明显减小。在交变静水压力条件下,由于压力交变引起了腐蚀产物与金属间的相互作用及锈层结构的变化而促进了金属的腐蚀,且静水压力越大对腐蚀的促进作用越大。在4 MPa至常压静水压力交变下,10CrNi3MoV钢的腐蚀速率约为常压时的3.5倍。

关键词 静水压力压力交变腐蚀产物电化学阻抗谱    
Abstract

The effect of hydrostatic pressure and its alternative variation on the corrosion behavior of 10CrNi3MoV steel in 3.5%(mass fraction)NaCl solution was studied by means of high-pressure static immersion test, potential measurement and electrochemical impedance spectra (EIS). The results show that the dissolved oxygen of solution and the ratio of Fe2O3 in the corrosion products all decrease with the enhancement of hydrostatic pressure, which result in the decline of corrosion potential and the decrease of corrosion rate. Alternative hydrostatic pressures led to the changes of the interaction between corrosion products and the steel, and the rust structures, which then enhanced the corrosion rate as a result, the corrosion rate increased with the increasing hydrostatic pressure. Under the specific conditions in this paper, the corrosion rate of 10CrNi3MoV steel in 3.5%NaCl solution under alternative hydrostatic pressures between atmospheric pressure and 4 MPa is 3.5 times of that under atmospheric pressure.

Key wordshydrostatic pressure    alternation of pressure    corrosion product    electrochemical impedance spectra
收稿日期: 2016-08-31     

引用本文:

董赋,胡裕龙,赵欣,王智峤. 静水压力对10CrNi3MoV钢腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2017, 37(2): 183-188.
Fu DONG, Yulong HU, Xin ZHAO, Zhiqiao WANG. Effect of Hydrostatic Pressure on Corrosion Behavior of 10CrNi3MoV Steel. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 183-188.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.135      或      https://www.jcscp.org/CN/Y2017/V37/I2/183

图1  高压试验装置示意图
图2  加压-降压时间示意图
图3  AP、2 MPa和4 MPa静水压力及2 MPa-AP和4 MPa-AP交替变化下的腐蚀电位
图4  不同静水压力下10CrNi3MoV钢在3.5%NaCl溶液中浸泡不同时间后的Nyquist图
Immersion time / h AP 2 MPa 4 MPa
0.5 2720 3082 4402
6 2213 2991 3522
12 2363 5744 ---
表1  不同静水压力下的电化学阻抗谱拟合结果
图5  2 MPa-AP和4 MPa-AP交变静水压力下10CrNi3MoV钢浸泡不同时间后的Nyquist图
Hydrostatic pressure 1.5 h 4 h(AP) 6.5 h 9 h(AP) 11.5 h 14 h(AP)
Alternation between 2 MPa-AP 4368 3598 4141 3142 2686 2289
Alternation between 4 MPa-AP 2790 2279 2263 2510 2181 1918
表2  交变静水压力条件下的电化学阻抗谱拟合结果
Hydrostatic pressure Corrosion rate / mma-1 Average corrosion ratemma-1
Sample 1# Sample 2# Sample 3#
AP 0.03201 0.02737 0.03146 0.03028
2 MPa 0.01552 0.01562 0.01613 0.01576
4 MPa 0.00935 0.00958 0.00952 0.00948
Alternation between 2 MPa-AP 0.08929 0.08769 0.07932 0.08543
Alternation between 4 MPa-AP 0.10636 0.11679 0.10705 0.11007
表3  10CrNi3MoV钢在不同静水压力及静水压力交替变化条件下的腐蚀速率
图6  10CrNi3MoV钢在不同压力条件下挂片后的表面形貌
图7  10CrNi3MoV钢在不同静水压力及静水压力交替变化条件下挂片实验后腐蚀产物的XRD谱
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