湿态电绝缘对电偶腐蚀行为的影响

doi:10.11902/1005.4537.2016.136

中国腐蚀与防护学报

2017, Vol. 37

Issue (2): 175-182 DOI: 10.11902/1005.4537.2016.136

研究报告

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湿态电绝缘对电偶腐蚀行为的影响

赵欣¹,胡裕龙¹(

),董赋¹,张晓东²,王智峤¹

1 海军工程大学理学院武汉 430033
2 海军工程大学科研部武汉 430033

Effect of Moistened Electrical Insulation on Galvanic Corrosion Behavior of Dissimilar Metals

Xin ZHAO¹,Yulong HU¹(

),Fu DONG¹,Xiaodong ZHANG²,Zhiqiao WANG¹

1 College of Science, Naval University of Engineering, Wuhan 430033, China
2 Office of Research & Development, Naval University of Engineering, Wuhan 430033, China;

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摘要:

采用串联不同阻值电阻和3种不同的湿态绝缘材料进行了模拟异种金属电绝缘连接构件的电偶腐蚀实验,研究了湿态电绝缘状态对船体钢-白铜电偶腐蚀的影响。结果表明：绝缘材料在湿态下可成为电子导电的材料,湿态绝缘材料的电阻既包括离子导电引起的离子电阻R_i,还包括电子导电引起的电子电阻R_e。湿态电绝缘下的白铜-船体钢电偶对中船体钢的腐蚀行为主要与湿绝缘材料的R_e有关。当R_e小于1 kΩ时,串联电阻时的电偶电流可高于直接短接时的电偶电流,船体钢的腐蚀速率可高于直接短接时的;当R_e大于1 kΩ时,R_e越大,电偶电流越小,船体钢的腐蚀速率越低。湿态绝缘材料R_e的形成与绝缘材料的材质有关,选择合适的电绝缘材料是防止白铜-船体钢电偶腐蚀的关键。

关键词 ：电偶腐蚀, 电绝缘处理, 湿态绝缘材料, 电子电阻

Abstract：

The effect of moistened electrical insulation on galvanic corrosion behavior of dissimilar metals was investigated with a simulated galvanic corrosion setup, which consisted of a cell containing 3%NaCl solution with hull steel and cupronickel as electrodes and then by series connecting resistance elements or moistened insulation materials into the circuit. The results showed that through moistening the insulation material can be transformed into electrical conducting material. The resistance of moistened insulation material (R_m) may involve ionic resistance (R_i) and electrical resistance (R_e), which are produced respectively by ionic conducting and electrical conducting. The corrosion behavior of the hull steel for the couple steel/cupronickel beneath a moistened insulation material may relate to the term R_e. When R_e is not higher than 1 kΩ, the galvanic current of the couple connected with a resistance element of a moistened insulation material may higher than that of the short-circuited couple, and the corrosion rates of hull steel of the couples connected with resistance elements may higher than that the short-circuited couple. When R_e is higher than 1 kΩ, the galvanic currents of the couples connected with resistance elements decreased with the increase of R_e, whilst the corrosion rate of the hull steel of the couples connected with resistance elements decreased with the increase of R_e. The conduction of the moistened insulation material related to the nature of insulation material, the key to prevent galvanic corrosion of couple hull steel/cupronickel is the appropriate selection of insulation material.

Key words： galvanic corrosion treatment of electrical insulation moistened insulation material electrical resistance

收稿日期: 2016-08-31

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引用本文:

赵欣,胡裕龙,董赋,张晓东,王智峤. 湿态电绝缘对电偶腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2017, 37(2): 175-182.
Xin ZHAO, Yulong HU, Fu DONG, Xiaodong ZHANG, Zhiqiao WANG. Effect of Moistened Electrical Insulation on Galvanic Corrosion Behavior of Dissimilar Metals. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 175-182.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.136 或 https://www.jcscp.org/CN/Y2017/V37/I2/175

表1 船体钢和B10合金的化学成分

图1 湿态绝缘电阻测量示意图

图2 电偶腐蚀实验装置示意图

图3 3种绝缘材料吸水率变化曲线

图4 3种绝缘材料的湿态电阻 (Rm) 变化曲线

图5 串联电阻的电偶对的腐蚀电位变化曲线

图6 B10与船体钢的电位差?E与串联电阻R的关系

图7 串联电阻的电偶对电偶电流Ig随时间的变化曲线

图8 稳态电偶电流与串联电阻之间的关系曲线

图9 串联电阻的电偶对腐蚀48 h后船体钢的电化学阻抗谱

表2 电偶对的稳定电位差?E和EIS拟合的船体钢极化电阻Rp随串联电阻R的变化

图10 串联湿态绝缘材料的电偶对的腐蚀电位随时间变化曲线

图11 串联湿态绝缘材料的电偶对的电偶电流Ig随时间的变化曲线

图12 湿态绝缘材料的等效电路模型

图13 串联湿态绝缘材料的电偶对浸泡48 h后船体钢的电化学阻抗谱

表3 串联湿态绝缘材料的电偶对的稳定电位差?E和EIS拟合的船体钢极化电阻Rp

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