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2219鋁合金攪拌摩擦焊接接頭剝落腐蝕機(jī)理
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國(guó)家自然科學(xué)基金青年基金（51105030）；哈爾濱工業(yè)大學(xué)先進(jìn)焊接與連接國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放課題（AWPT-M06）


Exfoliation Corrosion Mechanism of Friction Stir Welded 2219 Aluminum Alloy
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    摘要:

    采用原位腐蝕試驗(yàn)、靜態(tài)失重試驗(yàn)、浸泡試驗(yàn)研究了2219鋁合金攪拌摩擦焊接接頭的剝落腐蝕行為與機(jī)理。結(jié)果表明：2219鋁合金攪拌摩擦焊焊縫腐蝕速率比母材小，焊縫的抗腐蝕性提高；腐蝕從局部點(diǎn)蝕開(kāi)始，起源于第二相粒子與其邊緣的鋁基體，第二相粒子作陰極；原位腐蝕2 h后焊核與熱機(jī)影響區(qū)發(fā)生晶間腐蝕，母材發(fā)生嚴(yán)重的點(diǎn)蝕；均勻分布的第二相粒子與細(xì)小的等軸晶組織是焊核區(qū)剝落腐蝕敏感性降低的主要原因。

    Abstract:

    The corrosion behavior and mechanism of friction stir weld (FSW) joint of 2219 aluminum alloy was investigated by in-situ corrosion test, static mass loss test and immersion test. The results show that the corrosion rate of the weld is less than that of the parent material and the corrosion resistance of the weld improves greatly. The local pitting corrosion initially originates in dissolving of the adjacent matrix around the second phases and the second phase particles act as cathode. The intergranular corrosion happens in the weld nugget zone (WNZ) and thermo-mechanically affected zone (TMAZ) after in-situ corrosion test for 2 h and pitting corrosion occurs in base materials. The homogeneous second phase particles and fine equiaxed grains in the WNZ are the main reasons for the high resistance of exfoliation corrosion.

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張 華,孫大同,張 賀,馬芳芳,黃繼華.2219鋁合金攪拌摩擦焊接接頭剝落腐蝕機(jī)理[J].稀有金屬材料與工程,2015,44(1):103~107.[Zhang Hua, Sun Datong, Zhang He, Ma Fangfang, Huang Jihua. Exfoliation Corrosion Mechanism of Friction Stir Welded 2219 Aluminum Alloy[J]. Rare Metal Materials and Engineering,2015,44(1):103~107.]
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  • 收稿日期:2014-01-21
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  • 在線發(fā)布日期: 2015-05-22
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