6061-T6铝合金多道搭接FSP腐蚀性能

doi:10.11901/1005.3093.2014.669

材料研究学报

2015, Vol. 29

Issue (8): 589-594 DOI: 10.11901/1005.3093.2014.669

本期目录 | 过刊浏览

6061-T6铝合金多道搭接FSP腐蚀性能

王淼¹,刘强^1,²(

),张亚雄¹,张南南¹,刘满平^1,²

1. 江苏大学材料科学与工程学院镇江 212013
2. 江苏省高端结构材料重点实验室镇江 212013

Corrosion Property of Al-Alloy 6061-T6 Processed by Multi-pass Friction Stir Processing

Miao WANG¹,Qiang LIU^1,^2,^**(

),Yaxiong ZHANG¹,Nannan ZHANG¹,Manping LIU^1,²

1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
2. Jiangsu Province Key Laboratory of High-end Structural Materials, Zhenjiang 212013, China

引用本文:

王淼,刘强,张亚雄,张南南,刘满平. 6061-T6铝合金多道搭接FSP腐蚀性能[J]. 材料研究学报, 2015, 29(8): 589-594.
Miao WANG, Qiang LIU, Yaxiong ZHANG, Nannan ZHANG, Manping LIU. Corrosion Property of Al-Alloy 6061-T6 Processed by Multi-pass Friction Stir Processing[J]. Chinese Journal of Materials Research, 2015, 29(8): 589-594.

全文: PDF(5891 KB) HTML

摘要:

将6061-T6铝合金进行空冷、水冷的多道搭接搅拌摩擦加工(multi-pass FSP), 用金相显微镜、扫描电镜、透射电镜、浸泡腐蚀试验和电化学腐蚀等手段表征了核区材料的腐蚀性能。结果表明: 母材经这两种冷却方式的FSP改性后, 核区的晶粒明显细化, 腐蚀性能有显著的提高; 与母材相比, 核区的腐蚀电压较高, 腐蚀电流密度较小, 阻抗较大; 空冷FSP的核区材料比水冷的腐蚀性能更好。

关键词 ：材料失效与保护, 6061-T6铝合金, 搅拌摩擦加工, 核区, 腐蚀性能

Abstract：

The 6061-T6 aluminium alloy was modified by multi-pass friction stir process with air or water cooling. Corrosion behavior of the processed zone was investigated by immersion test and electrochemical corrosion test, as well as optical microscopy, SEM and TEM. The results show that the grain size of stirred zone was successfully refined and its corrosion resistance became better obviously after the base metal was modified by FSP with different cooling methods. Compared with the base metal, the nugget zone exhibited higher free-corrosion potential, smaller corrosion current density and greater corrosion impedance. Compared to FSP with water-cooling, the nugget zone prepared by FSP with air-cooling showed better corrosion resistance.

Key words： materials failure and protection 6061-T6 aluminium alloy friction stir process nugget zone corrosion property

收稿日期: 2014-11-12

基金资助:* 江苏省材料摩擦学重点实验室基金Kjsmcx2011004,江苏大学高级人才基金11JDG140和江苏省自然科学基金BK2012715资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.669 或 https://www.cjmr.org/CN/Y2015/V29/I8/589

图1 母材、空冷FSP核区和水冷FSP核区的金相组织

图2 T6态母材、空冷FSP核区和水冷FSP核区各试样的晶间腐蚀形貌

图3 各试样的剥落腐蚀形貌T6态母材、空冷FSP核区、水冷FSP核区以及空冷FSP的EDS能谱

图4 各试样的极化曲线

表1 电化学腐蚀参数

图5 各试样的Nyquist图

图6 T6态母材、空冷FSP核区以及水冷FSP核区试样的不同放大倍率透射电镜照片

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