Activation Effects of η Precipitates in the Al-Zn-In-Mg-Ti Sacrificial Anode Alloys

Ma Jingling1; Wen Jiuba1; Lu Xianwen1

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Activation Effects of η Precipitates in the Al-Zn-In-Mg-Ti Sacrificial Anode Alloys
Vol. 30, Issue 1, Pages: 18-21(2010)
Published： 2010 ，
DOI：

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[1]马景灵,文九巴,卢现稳.η相在Al-Zn-In-Mg-Ti牺牲阳极合金中的活化作用[J].特种铸造及有色合金,2010,30(01):18-21+122-123.

Ma Jingling1, Wen Jiuba1, Lu Xianwen1. Activation Effects of η Precipitates in the Al-Zn-In-Mg-Ti Sacrificial Anode Alloys. [J]. Special Casting & Nonferrous Alloys 30(1):18-21(2010)
[1]马景灵,文九巴,卢现稳.η相在Al-Zn-In-Mg-Ti牺牲阳极合金中的活化作用[J].特种铸造及有色合金,2010,30(01):18-21+122-123. DOI：

Ma Jingling1, Wen Jiuba1, Lu Xianwen1. Activation Effects of η Precipitates in the Al-Zn-In-Mg-Ti Sacrificial Anode Alloys. [J]. Special Casting & Nonferrous Alloys 30(1):18-21(2010) DOI：

摘要

采用扫描电镜、透射电镜、X射线衍射、电化学性能测试等方法

研究了Al-5Zn-0.02In-1Mg-0.05Ti牺牲阳极合金中析出相的腐蚀行为。结果表明

该合金主要含η-MgZn2析出相。η析出相相对α-Al基体呈阳极相

在3.5%的NaCl溶液中与α-Al基体组成微腐蚀电池

引起析出相自身溶解。溶解的Zn2+沉积在蚀坑周围

增加这些位置氧化膜的缺陷

促使氧化膜脱落。该牺牲阳极合金的溶解是以η析出相为活化中心

由此向外扩展

引发合金全面溶解。

Abstract

Activation effects of η precipitates in the Al-5Zn-0.02In-1Mg-0.05Ti sacrificial anode alloy were examined by SEM（scanning electron microscope）

TEM（transmission electron microscope）

XRD（X-ray diffraction）and electrochemical properties testing.The results reveal that the main precipitates are the MgZn2 phase（η phase）.The η precipitates are taken as anodic phase to form a micro-corrosion cell with α-Al matrix in 3.5%NaCl solution

leading to the self-dissolution of the precipitates.Dissolved Zn2+ is deposited around the pit to enhance the occurrence of oxidized defects and to promote the exfoliation of oxidization film.The η phases are acted as the activation center for alloy dissolution

resulting in the whole dissolution of the alloy by extending outward.