合金元素对铝合金在泰国曼谷地区初期腐蚀行为的影响

doi:10.11900/0412.1961.2019.00217

金属学报

2020, Vol. 56

Issue (1): 119-128 DOI: 10.11900/0412.1961.2019.00217

研究论文

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合金元素对铝合金在泰国曼谷地区初期腐蚀行为的影响

王力¹,董超芳¹(

),张达威¹,孙晓光²,Thee Chowwanonthapunya³,满成⁴,肖葵¹,李晓刚¹(

)

1. 北京科技大学腐蚀与防护中心北京 100083
2. 中车青岛四方机车车辆股份有限公司青岛 266111
3. Faculty of International Maritime Studies, Kasetsart University, Chonburi 20230, Thailand
4. 中国海洋大学材料科学与工程学院青岛 266100

Effect of Alloying Elements on Initial Corrosion Behavior of Aluminum Alloy in Bangkok, Thailand

WANG Li¹,DONG Chaofang¹(

),ZHANG Dawei¹,SUN Xiaoguang²,Chowwanonthapunya Thee³,MAN Cheng⁴,XIAO Kui¹,LI Xiaogang¹(

)

1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2. CRRC Qingdao Sifang Co. , Ltd. , Qingdao 266111, China
3. Faculty of International Maritime Studies, Kasetsart University, Chonburi 20230, Thailand
4. School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

引用本文:

王力,董超芳,张达威,孙晓光,Thee Chowwanonthapunya,满成,肖葵,李晓刚. 合金元素对铝合金在泰国曼谷地区初期腐蚀行为的影响[J]. 金属学报, 2020, 56(1): 119-128.
Li WANG, Chaofang DONG, Dawei ZHANG, Xiaoguang SUN, Thee Chowwanonthapunya, Cheng MAN, Kui XIAO, Xiaogang LI. Effect of Alloying Elements on Initial Corrosion Behavior of Aluminum Alloy in Bangkok, Thailand[J]. Acta Metall Sin, 2020, 56(1): 119-128.

全文: PDF(27368 KB) HTML

摘要:

在泰国曼谷地区对5083、6063和7020 3种铝合金进行为期1 a的暴晒实验，采用SEM、电化学实验、XPS和扫描Kelvin探针显微镜(SKPFM)对3种铝合金初期腐蚀形貌及腐蚀机理进行研究。结果表明：6063铝合金中Mg、Si、Fe等合金元素含量较少，腐蚀电位相对较高，约为-0.66 V (vs SCE)，腐蚀产物膜较为致密，耐蚀性较好，在泰国曼谷地区的腐蚀速率约为0.7 g/(m²·a)。7020铝合金含有较多Mg、Zn等合金元素，腐蚀电位约为-0.78 V (vs SCE)，腐蚀最为严重，腐蚀速率约为3.26 g/(m²·a)。3种铝合金均含有Mn、Si、Fe等合金元素，从而形成Fe-Si-Al或Fe-Si(Mn)-Al第二相，第二相表面电位高于基体225~280 mV，在大气环境中第二相作为阴极相，周围的基体Al优先溶解脱落，成为点蚀坑。

关键词 ：铝合金, 泰国曼谷, 大气腐蚀, 点蚀

Abstract：

With the rapid development of rail transit, high-speed trains are gradually exported to Southeast Asian countries. Aluminum alloy is widely used as a structural material such as train body and rail beam in high-speed trains, so that it is important to study the corrosion behavior of different aluminum alloy in Southeast Asia. The exposure test was conducted on 5083, 6063 and 7020 aluminum alloys in Bangkok, Thailand for 1 a. SEM, XPS, electrochemical experiment and scanning Kelvin probe force microscopy (SKPFM) were used to study the corrosion morphology and corrosion mechanism of different aluminum alloys. The results showed that the corrosion potential of 6063 aluminum alloys were relatively high, about -0.66 V (vs SCE), and the corrosion morphologies were relatively mild, which was due to less alloy elements such as Mg, Si and Fe in the 6063 aluminum alloys. The corrosion rate of 6063 aluminum alloys in Bangkok, Thailand was about 0.7 g/(m²·a). 7020 aluminum alloy contains more Zn elements, and the corrosion potential was about -0.78 V (vs SCE). The corrosion rate was the highest, about 3.26 g/(m²·a). The second phase of Fe-Si-Al or Fe-Si(Mn)-Al formed in the microstructure of the three aluminum alloys. The surface potential of the second phase was higher than that of the matrix, about 225~280 mV. In the atmospheric environment, the second phase acted as the cathode phase, and the surrounding matrix Al dissolved preferentially. The second phase fell off and formed a pit.

Key words： aluminum alloy Bangkok Thailand atmospheric corrosion pitting

收稿日期: 2019-07-03

ZTFLH:

TG146.2

基金资助:国家重点研发计划项目(2017YFB0702300);国家自然科学基金项目(51871028);国家材料环境腐蚀平台项目(2005DKA10400)

作者简介: 王力，男，1992年生，博士生

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	王力
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	Thee Chowwanonthapunya
	满成
	肖葵
	李晓刚
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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00217 或 https://www.ams.org.cn/CN/Y2020/V56/I1/119

表1 实验材料的化学成分 (mass fraction / %)

图1 5083、6063和7020铝合金的EBSD像

图2 5083、6063和7020 3种铝合金在曼谷暴晒1 a后的宏观和微观腐蚀形貌

图3 5083、6063和7020 3种铝合金曼谷暴晒1 a后的微观表面和截面SEM像

图4 在曼谷暴晒1 a后3种铝合金在0.1 mol/L NaCl中的极化曲线

图5 曼谷暴晒1 a后5083、6063和7020铝合金在0.1 mol/L NaCl中的电化学阻抗谱(EIS)

图6 EIS结果拟合电路图

表2 EIS拟合电路各元件参数

图7 5083、6063和7020 铝合金腐蚀产物XPS分析

图8 5083、6063和7020铝合金点蚀形貌及面扫描结果

图9 Fe-Si(Mn)-Al第二相的SEM像、表面EDS面扫描及SKPFM结果

图10 Fe-Si-Al第二相的SEM像、表面EDS面扫描及SKPFM结果

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