Effect of alternating current on the performance of magnesium sacrificial anode

被引：25

作者：

Tang, Dezhi ^{[1
]}

Du, Yanxia ^{[1
]}

Li, Xiaxi ^{[2
]}

Liang, Yi ^{[1
]}

Lu, Minxu ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Ctr Corros & Protect, Beijing 100083, Peoples R China

[2] Beijing Gas Grp Co Ltd, Beijing 100011, Peoples R China

来源：

MATERIALS & DESIGN | 2016年 / 93卷

关键词：

Magnesium; Sacrificial anode cathodic protection; Alternating current; Polarity reversal; Instant effect; Time effect; CATHODIC PROTECTION; CORROSION BEHAVIOR; ALLOY; MICROSTRUCTURE; PIPELINES; EVOLUTION;

D O I：

10.1016/j.matdes.2015.12.112

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Performance of magnesium sacrificial anode under alternating current was investigated in 4 g/L Na2SO4 simulated backfill solution by weight-loss measurements for 96 h, electrochemical measurements and surface examination. Alternating current increased the dissolution of magnesium, and at the same time, its DC potential shifted positively. The output cathodic protection current decreased at alternating current density of 50 A/m(2). Polarity reversal occurred to magnesium sacrificial anode as soon as alternating current interference of 100 A/m(2) (or larger) was applied. Besides the "instant effect", the polarity reversal showed a "time effect". It disappeared gradually at alternating current density of 100 A/m(2). When alternating current density was more than 200 A/m(2), the polarity reversal remained throughout the experiment (96 h). Based on the results of electrochemical measurements and surface examination, mechanism of polarity reversal was proposed. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：133 / 145

页数：13

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