<strong>1050A</strong>铝合金在山东不同典型环境中的大气腐蚀行为特征研究

doi:10.11902/1005.4537.2023.321

中国腐蚀与防护学报

2024, Vol. 44

Issue (4): 1055-1063 CSTR: 32134.14.1005.4537.2023.321 DOI: 10.11902/1005.4537.2023.321

轻质合金腐蚀与防护专栏

本期目录 | 过刊浏览

1050A铝合金在山东不同典型环境中的大气腐蚀行为特征研究

樊志彬(

), 高智悦, 宗立君, 吴亚平, 李辛庚, 姜波, 杜宝帅

国网山东省电力公司电力科学研究院济南 250001

Corrosion Behaviour and Characteristics of 1050A Al-alloy Exposed in Typical Atmospheres of Shandong Province

FAN Zhibin(

), GAO Zhiyue, ZONG Lijun, WU Yaping, LI Xingeng, JIANG Bo, DU Baoshuai

State Grid Shandong Electric Power Research Institute, Ji'nan 250001, China

引用本文:

樊志彬, 高智悦, 宗立君, 吴亚平, 李辛庚, 姜波, 杜宝帅. 1050A铝合金在山东不同典型环境中的大气腐蚀行为特征研究[J]. 中国腐蚀与防护学报, 2024, 44(4): 1055-1063.
Zhibin FAN, Zhiyue GAO, Lijun ZONG, Yaping WU, Xingeng LI, Bo JIANG, Baoshuai DU. Corrosion Behaviour and Characteristics of 1050A Al-alloy Exposed in Typical Atmospheres of Shandong Province[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 1055-1063.

全文: PDF(7668 KB) HTML

摘要:

在山东青岛、东营、威海、潍坊等典型大气环境中对1050A铝合金进行了为期42个月的自然暴晒试验。暴晒一定周期试样取回，利用宏观形貌、微观形貌、腐蚀速率、腐蚀产物分析和电化学分析等手段研究了其在山东典型大气环境中的腐蚀行为特征。结果表明：1050A铝合金具有较好的耐大气腐蚀性能，在山东青岛、东营、威海和潍坊不同典型大气环境中暴晒42个月后，腐蚀产物主要以Al的氧化物和氢氧化物为主；相对来说腐蚀速率东营>威海>青岛>潍坊，其腐蚀速率随暴晒时间延长而降低，这可能有腐蚀产物膜有关。通过激光共聚焦微观形貌分析可见，腐蚀以局部腐蚀为主，暴晒42个月以后，点蚀坑主要分布在10 μm以下。电化学阻抗结果表明在暴晒初期试样正反面腐蚀程度存在一定的差异，随着暴晒时间延长差异减弱。

关键词 ：铝合金, 大气腐蚀, 腐蚀速率, 腐蚀特征

Abstract：

A natural exposure test of 1050A Al-alloy was conducted in the typical atmospheric environments in the regions Qingdao, Dongying, Weihai and Weifang of Shandong Province for a period of 42 months. Afterwards, the corrosion behavior of the alloy was studied by means of macroscopic- and microscopic-morphology observation, corrosion rate measurement, corrosion product analysis and electrochemical test. The results show that 1050A Al-alloy has good atmospheric corrosion resistance, and the corrosion rate decreases with the increasing exposure time. Corrosion products are mainly Al-oxide and -hydroxide. The corrosion rate of 1050A Al-alloy tested at four different test sites may be ranked as following descending order: Dongying>Weihai>Qingdao>Weifang. The corrosion rate decreases with the extension of exposure time, which may be related to the presence of corrosion product scale. The laser confocal microscopic morphology analysis reveals that the corrosion is mainly pitting corrosion. The size of Pits was mainly below 10 μm after 42 months of exposure. The EIS result indicates that there exists a discernible discrepancy in the corrosion extent between the upward- and downward-sides of the test coupons at the initial exposure stage, which then gradually diminishes as the exposure time prolongs.

Key words： Al-alloy atmospheric corrosion corrosion rate corrosion characteristics

收稿日期: 2023-10-10 32134.14.1005.4537.2023.321

ZTFLH:

TG147

基金资助:国家电网有限公司总部科技项目(5200-202016471A-0-0-00)

通讯作者: 樊志彬，E-mail:fan200403707@163.com，研究方向为电网材料腐蚀防护技术

Corresponding author: FAN Zhibin, E-mail: fan200403707@163.com

作者简介: 樊志彬，男，1987年生，高级工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.321 或 https://www.jcscp.org/CN/Y2024/V44/I4/1055

图1 1050A铝合金在青岛、东营、威海及潍坊大气环境中暴晒宏观腐蚀形貌

图2 山东典型环境下自然暴晒试样腐蚀速率

图3 1050A铝合金在青岛、东营、威海及潍坊大气环境中暴晒不同时间的腐蚀产物分析

表1 图3中Raman峰所对应的位置[25~30]

图4 1050A铝合金在青岛，东营，威海及潍坊大气环境中暴晒42个月后的激光共聚焦形貌

图5 山东典型环境下自然暴晒不同时间试样点蚀统计图以及累积概率

图6 1050A铝合金在山东典型大气环境下暴晒后试样电化学阻抗谱分析

图7 自然暴晒后试样阻抗谱的等效电路

图8 山东4个地区典型环境下自然暴晒试样极化电阻

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