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7050鋁合金應(yīng)力腐蝕敏感性和鈍化膜引起的膜致應(yīng)力隨電位變化的一致性
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常州大學(xué)材料科學(xué)與工程學(xué)院

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TG178

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國家自然科學(xué)基金項目（面上項目，重點項目，重大項目）


Consistent Variation of Stress Corrosion Cracking Susceptibility and Passive Film-induced Stress for 7050 Aluminum Alloy with
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School of Materials Science and Engineering, Changzhou University

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    摘要:

    用流變應(yīng)力差值法測量了不同極化電位下7050鋁合金在3.5%NaCl 水溶液（pH=10）腐蝕過程中表面鈍化膜形成的拉應(yīng)力，并用慢應(yīng)變速率拉伸法測量了不同極化電位下的應(yīng)力腐蝕敏感性。結(jié)果表明:7050鋁合金在溶液中自然腐蝕時，表面鈍化膜會產(chǎn)生一定的拉應(yīng)力；陽極極化使表層拉應(yīng)力明顯上升，且隨著電位升高應(yīng)力增大；陰極極化時，當(dāng)電位E ≥-1100mV時表層拉應(yīng)力隨著電位的升高而降低，當(dāng)電位≤E-1100mV時拉應(yīng)力隨著電位升高而升高。應(yīng)力腐蝕敏感性隨外加電位變化規(guī)律和鈍化膜引起的附加拉應(yīng)力變化完全一致。

    Abstract:

    The film-induced stress and susceptibility to stress corrosion cracking (SCC) of 7050 aluminum alloy in the chloride solution at various potentials have been studied in this paper. The results showed that a large tensile stress was generated by the passive film during original corrosion. The passive film induced tensile stress increased obviously with an increase in potential under an anodic potential; however, it decreased with an increase in potential when the potential E≥-1100 mVSCE while it increased when E＜-1100 mVSCE under a cathodic potential. The variation of film-induced stress with potential was consistent with that of the susceptibility to SCC with potential.

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祁星.7050鋁合金應(yīng)力腐蝕敏感性和鈍化膜引起的膜致應(yīng)力隨電位變化的一致性[J].稀有金屬材料與工程,2016,45(8):1943~1948.[Qi Xing. Consistent Variation of Stress Corrosion Cracking Susceptibility and Passive Film-induced Stress for 7050 Aluminum Alloy with[J]. Rare Metal Materials and Engineering,2016,45(8):1943~1948.]
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  • 收稿日期:2014-06-23
  • 最后修改日期:2014-07-28
  • 錄用日期:2014-11-20
  • 在線發(fā)布日期: 2016-10-09
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