期刊信息

  • 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
  • 主办： 河北师范大学
  • ISSN： 1000-5854
  • CN： 13-1061/N
  • 中国科技核心期刊
  • 中国期刊方阵入选期刊
  • 中国高校优秀科技期刊
  • 华北优秀期刊
  • 河北省优秀科技期刊

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7075铝合金的晶界特征分布及其对晶间腐蚀行为的影响

  • (1.河北师范大学 分析测试中心，河北 石家庄 050024； 2.河钢材料技术研究院，河北 石家庄 052165； 3.沈阳大学 辽宁省先进材料重点实验室，辽宁 沈阳 110044)
  • DOI： 10.13763/j.cnki.jhebnu.nse.202603009

Grain boundary character distribution and its influence on intergranular corrosion behavior of 7075 aluminum alloy

摘要/Abstract

摘要：

7075铝合金极易发生晶间腐蚀（intergranular corrosion,IGC）和剥落腐蚀.为研究7075铝合金晶界特征分布（grain boundary character distribution,GBCD）对晶间腐蚀的影响，通过电子背散射衍射（electron back scatter diffraction,EBSD）技术对其晶界特征分布进行表征，借助金相显微镜观察其在25 ℃、pH=2、质量分数为3.5%的NaCl溶液中浸泡1.5、7 h后的腐蚀形貌.结果表明，随着浸泡时间的延长，7075铝合金的晶间腐蚀速率增加，其中大角度晶界的腐蚀增长速率最快.本研究明确了7075铝合金晶界特征分布与晶间腐蚀行为之间的相关性，为调控晶界结构和改善其耐蚀性能提供实验和理论依据.

Abstract：

The 7075 aluminum alloy is susceptible to intergranular corrosion(IGC) and exfoliation corrosion.To investigate the effect of grain boundary character distribution(GBCD) of 7075 aluminum alloy on intergranular corrosion,the grain boundary character distribution was characterized by electron back scatter diffraction(EBSD).The corrosion morphologies were observed by metallurgical microscope after soaking in 3.5% NaCl solution(pH=2,25 ℃) for 1.5,7 h,respectively.The results showed that with the increase of soaking time,the intergranular corrosion rate of 7075 aluminum alloy increased,and the corrosion growth rate of large angle grain boundaries was the fastest.This study clarifies the correlation between the grain boundary character distribution and intergranular corrosion behavior in 7075 aluminum alloy,providing experimental and theoretical basis for regulating grain boundary structure and improving its corrosion resistance.

关键词

关键词： 7075铝合金；晶界特征分布；电子背散射衍射；晶间腐蚀；耐蚀性
Key words： 7075 aluminum alloy ; grain boundary character distribution ; electron back scatter diffraction ; intergranular corrosion ; corrosion resistance

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