【摘要】：使用掃描電鏡、交流阻抗譜和掃描開(kāi)爾文探針等手段研究了7A04鋁合金在周期凝露和二氧化硫條件下的腐蝕行為和規(guī)律。結(jié)果表明,7A04鋁合金在周期凝露和二氧化硫環(huán)境中的腐蝕主要是薄液膜下的大氣腐蝕,隨著時(shí)間的延長(zhǎng)腐蝕產(chǎn)物不斷增多,腐蝕失重的數(shù)值增大,腐蝕產(chǎn)物的形貌呈點(diǎn)狀或團(tuán)狀,主要是氫氧化鋁和硫酸鋁水合物;腐蝕類型主要為點(diǎn)蝕,局部有輕微剝蝕;交流阻抗擬合數(shù)值顯示,在試驗(yàn)的初期7A04鋁合金的腐蝕速率急劇下降,后期逐漸趨于平緩;表面電位分布圖譜顯示,材料表面的腐蝕電位呈升高趨勢(shì),至240 h后趨于穩(wěn)定,7A04鋁合金的腐蝕溶解,與其組織和組成分布密切相關(guān)。
[Abstract]:The corrosion behavior and regularity of 7A04 aluminum alloy under the condition of periodic condensation and sulfur dioxide were studied by means of scanning electron microscope (SEM), AC impedance spectroscopy (EIS) and scanning Calvin probe. The results show that the corrosion of 7A04 aluminum alloy in periodic condensation and sulfur dioxide environment is mainly atmospheric corrosion under thin liquid film, and the corrosion products increase with the prolongation of time, and the corrosion products are punctate or cluster, mainly aluminum hydroxide and aluminum sulfate hydrate, and the corrosion types are mainly pitting corrosion and local slight denudation. The AC impedance fitting values show that the corrosion rate of 7A04 aluminum alloy decreases sharply at the initial stage of the test, and gradually tends to flatten at the later stage, and the surface potential distribution pattern shows that the corrosion potential on the surface of the material increases and tends to be stable after 240h. The corrosion dissolution of 7A04 aluminum alloy is closely related to the distribution of microstructure and composition.
【作者單位】： 武漢科技大學(xué)材料與冶金學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(50971048) 國(guó)家科技基礎(chǔ)條件平臺(tái)專題~~
【分類號(hào)】：TG178

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本文編號(hào)：2527644