Corrosion resistance of directionally solidified Al-6Cu-1Si and Al-8Cu-3Si alloys castings

被引：72

作者：

Osorio, Wislei R. ^{[1
,2
]}

Peixoto, Leandro C. ^{[2
]}

Moutinho, Daniel J. ^{[2
]}

Gomes, Laercio G. ^{[2
]}

Ferreira, Ivaldo L. ^{[3
]}

Garcia, Amauri ^{[2
]}

机构：

[1] Univ Estadual Campinas, Sch Appl Sci, UNICAMP, BR-13484350 Limeira, SP, Brazil

[2] Univ Estadual Campinas, Dept Mat Engn, UNICAMP, BR-13083970 Campinas, SP, Brazil

[3] Univ Fed Fluminense, Dept Mech Engn, BR-27255125 Volta Redonda, RJ, Brazil

来源：

MATERIALS & DESIGN | 2011年 / 32卷 / 07期

基金：

巴西圣保罗研究基金会;

关键词：

Non-ferrous metals and alloys; Casting; Corrosion; UNSTEADY-STATE SOLIDIFICATION; AL-CU ALLOYS; MECHANICAL-PROPERTIES; ELECTROCHEMICAL-BEHAVIOR; INTERMETALLIC PHASES; DENDRITE SPACINGS; ALUMINUM-ALLOYS; SILICON CONTENT; SI ALLOY; PARAMETERS;

D O I：

10.1016/j.matdes.2011.03.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The aim of this article is to compare the electrochemical corrosion resistance of two as-cast Al-6 wt.% Cu-1 wt.% Si and Al-8 wt.% Cu-3 wt.% Si alloys considering both the solutes macrosegregation profiles and the scale of the microstructure dendritic arrays. A water-cooled unidirectional solidification system was used to obtain the as-cast samples. Electrochemical impedance spectroscopy (EIS) and potentiodynamic anodic polarization techniques were used to analyze the corrosion resistance in a 0.5 M NaCl solution at 25 degrees C. It was found that the Al-8Cu-3Si alloy has better electrochemical corrosion resistance than the Al-6Cu-1Si alloy for any position along the casting length. At the castings regions where the Cu inverse profile prevailed (up to about 10 mm from the castings surface) the corrosion current density decreased up to 2.5 times with the decrease in the secondary dendrite arm spacing. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：3832 / 3837

页数：6

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