本文關(guān)鍵詞：緩蝕劑對鎂合金在氯化鈉溶液中腐蝕行為影響研究　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： AZ31B鎂合金 緩蝕劑 腐蝕 電化學(xué)測試

【摘要】：鎂合金由于其質(zhì)量輕、比強(qiáng)度/比剛度高、良好的壓鑄性等優(yōu)點(diǎn)而得到廣泛應(yīng)用,現(xiàn)已成為一種重要的工程結(jié)構(gòu)材料。但是,鎂合金高的化學(xué)活性和差的耐蝕性,嚴(yán)重制約其優(yōu)勢在工業(yè)領(lǐng)域的發(fā)揮。在眾多的抑制鎂合金腐蝕的措施中,緩蝕劑防腐蝕技術(shù)是一種非常經(jīng)濟(jì)、有效的方法。因此,本文采用電化學(xué)測試、浸泡失重測試及掃描電子顯微鏡、傅里葉變換紅外光譜等表面分析技術(shù),研究了所選單組份緩蝕劑及復(fù)配型緩蝕劑對AZ31B鎂合金在3.5 wt.%NaCl溶液中的緩蝕行為及緩蝕機(jī)理,主要研究結(jié)果如下:(1)單獨(dú)使用二乙基二硫代氨基甲酸鈉(SDDTC)、乙酸鈉(NaAc)和磷酸氫二鈉(Na_2HPO_4)時(shí),均可有效延緩AZ31B鎂合金在NaCl溶液中的腐蝕速度。隨著緩蝕劑濃度的增加,緩蝕效率均呈現(xiàn)先增大后減小的趨勢,它們單獨(dú)使用時(shí)達(dá)到的最佳緩蝕效率及添加的濃度分別為:添加5.0×10~(-3)mol L~(-1) SDDTC時(shí),緩蝕效率為69%;添加0.20mol L~(-1) NaAc時(shí),緩蝕效率為80%;添加3.0×10~(-3)mol L~(-1) Na_2HPO_4時(shí),緩蝕效率為92.9%。(2)當(dāng)SDDTC與NaAc復(fù)配使用時(shí),在特定的濃度下,二者會產(chǎn)生協(xié)同作用;當(dāng)濃度為10.0×10~(-3)mol L~(-1) SDDTC+0.15mol L~(-1) NaAc時(shí),緩蝕效率最高為90.4%。SDDTC與NaAc均符合Langmuir吸附模型,均在鎂合金表面發(fā)生物理吸附,形成了一層致密的保護(hù)性混合膜:SDDTC-Mg+NaAcMg+Mg(OH)_2。(3)SDDTC與Na_2HPO_4共同使用時(shí),緩蝕效率明顯增大,當(dāng)濃度為2.0×10~(-3)mol L~(-1) Na_2HPO_4+10.0×10~(-3)mol L~(-1) SDDTC時(shí),緩蝕效率最高,達(dá)到了94%。兩種緩蝕劑復(fù)配時(shí),在鎂合金表面形成一層非常致密的保護(hù)膜,提高了緩蝕效率,明顯抑制了鎂合金的腐蝕。
[Abstract]:Magnesium alloy has been widely used because of its light weight, high specific strength / specific stiffness, good die-casting properties, and has become an important engineering structural material. Magnesium alloys have high chemical activity and poor corrosion resistance, which seriously restrict their advantages in the industrial field. Corrosion inhibitor corrosion prevention technology is very economical among many measures to inhibit magnesium alloy corrosion. Therefore, surface analysis techniques such as electrochemical test, immersion weightlessness test, scanning electron microscope and Fourier transform infrared spectroscopy were used in this paper. The corrosion inhibition behavior and corrosion inhibition mechanism of AZ31B magnesium alloy in 3.5 wt.%NaCl solution were studied. The main results are as follows: (1) when the sodium diethyldithiocarbamate (SDDTCX), sodium acetate (NAAC) and disodium hydrogen phosphate (Na2HPO4) are used alone. The corrosion rate of AZ31B magnesium alloy in NaCl solution can be effectively delayed. With the increase of inhibitor concentration, the corrosion inhibition efficiency increases first and then decreases. The optimum corrosion inhibition efficiency and the added concentration are: 5.0 脳 10 ~ (-3) mol / L ~ (-1) SDDTC. The corrosion inhibition efficiency was 80 when 0.20mol / L ~ (-1) NaAc was added. When 3.0 脳 10 ~ (-3) mol / L ~ (-1) Na_2HPO_4 was added, the corrosion inhibition efficiency was 92.9%.) when SDDTC was combined with NaAc, the corrosion inhibition efficiency was 92.9%. At certain concentration, the two have synergistic effect. When the concentration was 10.0 脳 10 ~ (-1) mol / L ~ (-1) SDDTC, 0.15mol / L ~ (-1) NaAc. The highest corrosion inhibition efficiency is 90.4. SDDTC and NaAc accord with the Langmuir adsorption model, and physical adsorption occurs on the surface of magnesium alloy. A dense protective mixture membrane: SDDTC-Mg NaAcMg Mg(OH)_2.(3)SDDTC was formed when it was used together with Na_2HPO_4. The corrosion inhibition efficiency is obviously increased. When the concentration was 2.0 脳 10 ~ (-3) mol / L ~ (-1) Na_2HPO_4, the concentration was 10.0 脳 10 ~ (-3) mol / L ~ (-1) SDDTC. When the two inhibitors are mixed, a very dense protective film is formed on the surface of magnesium alloy, which improves the corrosion inhibition efficiency and obviously inhibits the corrosion of magnesium alloy.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG174.42

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