本文選題：氣相緩蝕劑 + 復(fù)配��； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：本文針對(duì)金屬在大氣中的腐蝕,制備通用型氣相防銹薄膜,并研究氣相緩蝕劑在液膜下對(duì)金屬的緩蝕機(jī)理。首先采用電化學(xué)工作站(Tafel極化曲線)和交流阻抗儀(EIS)進(jìn)行電化學(xué)試驗(yàn),對(duì)氣相緩蝕劑進(jìn)行復(fù)配并研究其在NaCl溶液中對(duì)Q235鋼和黃銅的緩蝕效率,得到最佳配方的氣相緩蝕劑。其次將氣相緩蝕劑的最佳配方用涂覆法制成氣相防銹薄膜,在模擬高溫高濕環(huán)境的恒溫恒濕箱內(nèi)進(jìn)行濕熱試驗(yàn),計(jì)算出其緩蝕率。表征金屬電極表面,研究氣相緩蝕劑的緩蝕機(jī)理,以及溫度和Cl-濃度對(duì)氣相緩蝕劑的影響。電化學(xué)試驗(yàn)結(jié)果表明,當(dāng)鉬酸銨、三乙醇胺、苯甲酸鈉與硫酸鋅四元復(fù)配氣相緩蝕劑的配比濃度為2g/L: 8g/L: 10g/L: 4g/L時(shí),氣相緩蝕劑對(duì)Q235鋼緩蝕率達(dá)到90.78 %,對(duì)黃銅緩蝕率達(dá)到87.65%,四元復(fù)配氣相緩蝕劑在NaCl溶液中(質(zhì)量分?jǐn)?shù)3.5%)對(duì)Q235鋼和黃銅的腐蝕速率明顯降低,有很好的緩蝕效果。濕熱試驗(yàn)與電化學(xué)實(shí)驗(yàn)結(jié)果一致,四元復(fù)配氣相緩蝕劑對(duì)Q235鋼的緩蝕率達(dá)到87.63%,對(duì)黃銅的緩蝕率達(dá)到86.56%,緩蝕效果較好。四元復(fù)配氣相緩蝕劑配方中的各組分之間存在協(xié)同效應(yīng),較單一氣相緩蝕劑的緩蝕效果有了顯著的提高。金屬表征結(jié)果表明,對(duì)于Q235鋼,復(fù)配氣相緩蝕劑是混合型緩蝕劑,抑制碳鋼陰陽極的電化學(xué)反應(yīng),復(fù)配氣相緩蝕劑的N、O原子上的孤對(duì)電子與Fe的d軌道配位成鍵,在Q235鋼表面形成吸附膜,從能譜圖中可以看出氣相緩蝕劑會(huì)阻止Q235鋼表面形成Fe2O3等腐蝕產(chǎn)物,吸附膜具有一定的疏水性,緩蝕率隨著溫度升高略微增大,而Cl-濃度越低,緩蝕率越大。對(duì)于黃銅,復(fù)配氣相緩蝕劑主要抑制陽極腐蝕反應(yīng)具有緩蝕效果。在黃銅表面,復(fù)配氣相緩蝕劑揮發(fā)出的N原子與Cu相互作用并形成一層很薄的保護(hù)膜,從能譜圖中可以看出氣相緩蝕劑會(huì)阻止黃銅表面形成Cu(I),Cu2O等腐蝕產(chǎn)物,保護(hù)膜具有一定的疏水性。當(dāng)溫度在50～60℃時(shí),氣相緩蝕劑對(duì)黃銅的緩蝕率達(dá)到最大,緩蝕率隨Cl-濃度的降低而增高。
[Abstract]:In this paper, a general gas phase anticorrosive film is prepared for the corrosion of metals in the atmosphere, and the corrosion inhibition mechanism of the gas phase corrosion inhibitor on the metal under the liquid film is studied. Firstly, electrochemical experiments were carried out by using an electrochemical workstation (Tafel polarization curve) and an alternating current impedance meter (EIS). The gas phase corrosion inhibitor was compounded and its corrosion inhibition efficiency to Q235 steel and brass in NaCl solution was studied. The optimum formulation of gas phase inhibitor was obtained. Secondly, the best formulation of gas phase corrosion inhibitor was coated to form gas phase antirust film, and the corrosion inhibition rate was calculated in a constant temperature and humidity chamber under simulated high temperature and high humidity environment. The corrosion inhibition mechanism of gas phase inhibitor and the effect of temperature and Cl- concentration on gas phase corrosion inhibitor were studied by characterizing the surface of metal electrode. The electrochemical test results show that when the concentration of the compound gas phase corrosion inhibitor of ammonium molybdate, triethanolamine, sodium benzoate and zinc sulfate is 2 g / L: 8 g / L: 10 g / L: 4 g / L, The corrosion rate of Q235 steel and brass was 90.78 for gas phase inhibitor and 87.65 for brass respectively. The corrosion rate of Q235 steel and brass was obviously decreased by four-element gas phase inhibitor in NaCl solution (3.5% by mass fraction), and the corrosion rate of Q235 steel and brass was very good. The results of hygrothermal test and electrochemical experiment were consistent. The corrosion inhibition rate of Q235 steel was 87.63 for four-component gas phase corrosion inhibitor and 86.566.56 for brass. The corrosion inhibition effect was better. There is a synergistic effect among the components in the composition of the four-component compound gas phase corrosion inhibitor, which is significantly improved than that of the single gas phase inhibitor. The results of metal characterization show that for Q235 steel, the compound gas phase inhibitor is a mixed corrosion inhibitor, which inhibits the electrochemical reaction of the cathode and anode of carbon steel, and the coordination bond between the lone pair electrons on the N2O atom of the compound gas phase inhibitor and the d orbital of Fe. The adsorption film was formed on the surface of Q235 steel. The gas phase corrosion inhibitor can prevent the formation of Fe _ 2O _ 3 and other corrosion products on the surface of Q235 steel. The adsorption film has a certain hydrophobicity, and the corrosion inhibition rate increases slightly with the increase of temperature, while the concentration of Cl- is lower. The higher the corrosion inhibition rate is. For brass, the compound gas-phase inhibitor mainly inhibits the anodic corrosion reaction. On the surface of brass, the N atoms volatilized by the compound gas phase inhibitor interact with Cu and form a thin protective film. It can be seen from the energy spectrum that the corrosion products such as Cu (I) and Cu _ 2O can be prevented from forming on the brass surface by the gas phase corrosion inhibitor. The protective film has a certain hydrophobicity. When the temperature is 50 ~ 60 鈩，

本文編號(hào)：2093893