<strong>ZCuSn5Pb5Zn5/B10</strong>偶对在流动海水中的腐蚀规律与机制研究

doi:10.11902/1005.4537.2022.412

中国腐蚀与防护学报

2023, Vol. 43

Issue (6): 1339-1348 CSTR: 32134.14.1005.4537.2022.412 DOI: 10.11902/1005.4537.2022.412

研究报告

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ZCuSn5Pb5Zn5/B10偶对在流动海水中的腐蚀规律与机制研究

邢少华¹(

), 刘仲晔², 刘近增³, 白舒宇¹, 钱峣⁴, 张大磊⁵

^1.中国船舶集团公司第七二五研究所海洋腐蚀与防护重点实验室青岛 266237
^2.海军装备部驻湘潭地区军事代表室湘潭 411100
^3.海洋石油工程 (青岛) 有限公司青岛 266520
^4.青岛市即墨区工业和信息化局青岛 266205
^5.中国石油大学 (华东) 材料科学与工程学院青岛 266580

Galvanic Corrosion Behavior of ZCuSn5Pb5Zn5/B10 Couple in Flowing Seawater

XING Shaohua¹(

), LIU Zhongye², LIU Jinzeng³, BAI Shuyu¹, QIAN Yao⁴, ZHANG Dalei⁵

^1.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China
^2.Military Representative Office of Naval Equipment Department in Xiangtan Region, Xiangtan 411100, China
^3.Offshore Oil Engineering (Qingdao) Co., Ltd., Qingdao 266520, China
^4.Qingdao Jimo District Bureau of Industry and Information Technology, Qingdao 266205, China
^5.School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China

引用本文:

邢少华, 刘仲晔, 刘近增, 白舒宇, 钱峣, 张大磊. ZCuSn5Pb5Zn5/B10偶对在流动海水中的腐蚀规律与机制研究[J]. 中国腐蚀与防护学报, 2023, 43(6): 1339-1348.
Shaohua XING, Zhongye LIU, Jinzeng LIU, Shuyu BAI, Yao QIAN, Dalei ZHANG. Galvanic Corrosion Behavior of ZCuSn5Pb5Zn5/B10 Couple in Flowing Seawater[J]. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1339-1348.

全文: PDF(19143 KB) HTML

摘要:

通过电化学法和微观形貌表征手段研究了ZCuSn5Pb5Zn5和B10管状偶对在静态以及1、3和5 m/s流速海水中的电偶腐蚀规律，探讨了电偶腐蚀机理。结果表明：在静态海水中，ZCuSn5Pb5Zn5和B10几乎不发生电偶腐蚀，且多次发生极性反转现象；流动海水中，ZCuSn5Pb5Zn5和B10间电偶腐蚀速率显著增加，1、3和5 m/s流速海水中的电偶腐蚀分别是静态海水中的22倍、49倍和69倍。混合电位理论分析表明ZCuSn5Pb5Zn5/B10电偶腐蚀速率是由ZCuSn5Pb5Zn5阳极反应动力学和B10阴极反应动力学共同控制，流动海水加速溶解氧、腐蚀产物扩散，金属阳极溶解和溶解氧还原速率增加，电偶腐蚀速率增加；在低流速条件下，阳极表面沉积腐蚀产物可抑制电偶腐蚀，但流速达到3 m/s以上时，腐蚀产物难以形成，保护作用逐渐减弱。

关键词 ：海水管路, 截止阀, 铜镍合金, 流动海水, 电偶腐蚀

Abstract：

Valve is one of the most important components for seawater pipeline, and is widely used in ship, but it suffers from serious corrosion, which leads to leaking or unclosing. Galvanic corrosion between ZCuSn5Pb5Zn5 and B10 is the main cause of such corrosion. In this paper, the galvanic corrosion of the couple ZCuSn5Pb5Zn5/B10 in flowing seawater and the galvanic corrosion mechanism is assessed by means of electrochemical method, SEM and EDS. The results suggest that, in static seawater, the galvanic corrosion rate between ZCuSn5Pb5Zn5 and B10 is very small, the relevant anode and cathode are reversed many times. In flowing seawater of 1, 3 and 5 m/s, the galvanic corrosion rate of ZCuSn5Pb5Zn5 obviously increases, which is 22, 49 and 69 times of that in static seawater respectively. In flowing seawater, the diffusion rate of dissolved oxygen and corrosion products is accelerated and the relevant anodic- and cathodic-reactions are both accelerated, thus the galvanic corrosion rate increases. The galvanic corrosion between ZCuSn5Pb5Zn5 and B10 is controlled by both the ZCuSn5Pb5Zn5 anodic reaction and the B10 cathodic reaction. With the gradually depositions of corrosion products, the anodic- and cathodic-reactions are inhibited, however when the flowing rate is more than 3 m/s, the deposition of corrosion products turns to be difficult, thus cannot provide proper barrier effect to the galvanic corrosion.

Key words： seawater pipelines valve copper nickel alloy flowing seawater galvanic corrosion

收稿日期: 2022-12-27 32134.14.1005.4537.2022.412

ZTFLH:

TG174

通讯作者: 邢少华，E-mail: xingsh@sunrui.net，研究方向为海洋腐蚀与防护

Corresponding author: XING Shaohua, E-mail:xingsh@sunrui.net

作者简介: 邢少华，男，1981年生，博士，高级工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2022.412 或 https://www.jcscp.org/CN/Y2023/V43/I6/1339

图1 流动海水电偶腐蚀测试电解池示意图及海水管路综合模拟平台

图2 ZCuSn5Pb5Zn5、B10腐蚀电位和ZCuSn5Pb5Zn5/B10电偶电位

图3 ZCuSn5Pb5Zn5/B10偶对电偶电流随时间变化曲线

图4 电偶电流密度和电偶电位随流速变化曲线

图5 ZCuSn5Pb5Zn5微观形貌图

图6 ZCuSn5Pb5Zn5腐蚀产物元素组成EDS分析

图7 ZCuSn5Pb5Zn5去除产物后的三维形貌

图8 ZCuSn5Pb5Zn5去除产物后SEM形貌图

图9 B10腐蚀产物SEM形貌图

图10 B10腐蚀产物元素组成EDS分析

图11 B10去除腐蚀产物后的SEM形貌图

图12 ZCuSn5Pb5Zn5/B10偶对电偶腐蚀动力学分析

图13 ZCuSn5Pb5Zn5/B10偶对在静态海水中的电偶腐蚀机理图

图14 ZCuSn5Pb5Zn5/B10偶对在1 m/s流速下的电偶腐蚀机理图

图15 ZCuSn5Pb5Zn5/B10偶对在3 m/s流速下的电偶腐蚀机理图

图16 ZCuSn5Pb5Zn5/B10偶对在5 m/s流速下的电偶腐蚀机理图

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