Corrosion Behavior of High Strength and High Electrical Conductivity Al-Mg-Si Alloy Wires with Large Area Reduction

doi:10.11902/1005.4537.2021.362

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (6): 1002-1008 DOI: 10.11902/1005.4537.2021.362

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Corrosion Behavior of High Strength and High Electrical Conductivity Al-Mg-Si Alloy Wires with Large Area Reduction

LI Fengming¹^,², HOU Jiapeng², XIE Guangzong³, WU Ximao⁴, WANG Qiang²(

), ZHANG Zhefeng²

1. Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450001, China
2. Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. North-East Branch of China Huaneng Group Co. Ltd., Shenyang 110167, China
4. Electric Power Research Institute of Liaoning Electric Power Co. Ltd., Shenyang 110006, China

Cite this article:

LI Fengming, HOU Jiapeng, XIE Guangzong, WU Ximao, WANG Qiang, ZHANG Zhefeng. Corrosion Behavior of High Strength and High Electrical Conductivity Al-Mg-Si Alloy Wires with Large Area Reduction. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 1002-1008.

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Abstract

The corrosion behavior of high strength and high electrical conductivity Al-Mg-Si alloy wires used for long-distance overhead conductors was studied by means of immersion corrosion test and electrochemical tests. The results show that corrosion first started at the interface between Al-Fe-Si phase (or Si-rich phase) and α-matrix due to the micro-galvanic effect during the 20 d immersion corrosion in 3.5%NaCl solution. With the progress of corrosion process, Al-Fe-Si phase and Si-rich phase peeled off and corrosion pits formed. According to statistics, the sizes of Al-Fe-Si phase and Si-rich phase decrease gradually with the increasing area reduction of Al-Mg-Si alloy wire; accordingly, the extreme average depth of corrosion pits decreases gradually. This indicated that the size of Al-Fe-Si phase and Si-rich phase is the key factor dominating the pitting corrosion behavior of Al-Mg-Si alloy wire.

Key words: overhead conductor high-strength-high electrical conductivity alloy wire corrosion crystalline phase area reduction

Received: 25 December 2021

ZTFLH:

TG146.2

Fund: National Natural Science Foundation of China(52001313);China Postdoctoral Science Foundation(2019M661151)

About author: WANG Qiang, E-mail: gmwang@imr.ac.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.362 OR https://www.jcscp.org/EN/Y2022/V42/I6/1002

Table 1 Diameter and area reduction of Al-Mg-Si alloy wires samples

Fig.1 Dynamic potential polarization curves of Al-Mg-Si alloy wires with area reduction of 55.3% and 84.7%, respectively

Table 2 Parameters extrated from the dynamic potential polarization curves of Al-Mg-Si alloy wires with 55.3% and 84.7% area reduction, respectively

Fig.2 Surface corrosion morphologies (a-c) and EDS analysis (d-f) of Al-Mg-Si alloy wire with 55.3% (a, d), 72.3% (b, e) and 84.7% (c, f) area reduction

Fig.3 Cross-sectional morphologies of corrosion pits on Al-Mg-Si alloy wire with 55.3% (a),72.3% (b) and 84.7% (c) area reduction

Fig.4 Extreme average depth of corrosion pits on Al-Mg-Si alloy wires with large area reductions

Fig.5 Microstructure characterization of Al-Mg-Si alloy wires with 55.3% (a, c) and 84.7% (b, d) area reduction by EBSD

Fig.6 Secondary electron images (a-c) and EDS analysis (d-f) of the blocky phase in Al-Mg-Si alloy wires with 55.3% (a, d), 72.3% (b, e) and 84.7% (c, f) area reduction

Fig.7 Evolution of the blocky phase size in Al-Mg-Si alloy wires with large area reductions (a) and the relationship between the crystalline phase size and the EDCP (b)

Fig.8 EDS analysis of corrosion products in the corrosion pit, surface morphology (a) of surface scanning and elemental distribution of Al (b) and Cl (c)

Fig.9 Schematic diagrams of the mechanism on the emergence and growth of pitting corrosion on Al-Mg-Si alloy wires: (a) emergence of corrosion pit; (b) growth of corrosion pit

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