Corrosion behavior of Pb-39Mg-10Al-1.5B alloy in sodium halide solutions

被引：12

作者：

Duan, Yonghua ^{[1
]}

Li, Ping ^{[1
]}

Zhang, Min ^{[2
]}

Peng, Mingjun ^{[1
]}

Ma, Lishi ^{[1
]}

Shu, Baipo ^{[1
]}

机构：

[1] Kunming Univ Sci & Technol, Sch Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China

[2] Liaoning Normal Univ, Sch Phys & Elect Technol, Dalian 116029, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 729卷

基金：

中国国家自然科学基金;

关键词：

Pb-39Mg-10Al-1.5B alloy; Corrosion behavior; EIS; EN; Corrosion product; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; WT-PERCENT-SN; NOISE MEASUREMENTS; AQUEOUS-SOLUTIONS; MAGNESIUM ALLOY; GAMMA-RADIATION; AZOLE COMPOUNDS; BORATE GLASSES; LEAD BORATE; ACID;

D O I：

10.1016/j.jallcom.2017.09.248

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electrochemical corrosion behavior of Pb-39Mg-10Al-1.5B alloy in 3.5 wt% NaX (X = F, Cl, Br and I) sodium halide solutions was investigated by polarizing curve test, electrochemical impedance spectroscopy (EIS) and electrochemical noise (EN), aiming to assess the corrosion damage degree of the alloy in the cooling waters containing halide elements. The results of polarizing curves, EIS and EN indicate that the corrosion resistance of Pb-39Mg-10Al-1.5B alloy in these sodium halide solutions is in the order of NaF > NaI > NaBr > NaCl. The obtained pitting characteristic frequency f(n) and noise resistance R-n reveal that the corrosion type of the alloy in NaF and NaI solutions is localized corrosion and that in NaCl and NaBr solutions mainly is general corrosion. Magnesium is the most prone to corroded phase in Pb-39Mg10Al-1.5B alloy. The corrosion of magnesium is influenced by the corrosion product layer that the compact corrosion product layer can prevent its corrosion while the porous one can accelerate its corrosion. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：1108 / 1117

页数：10

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