發(fā)布時(shí)間：2019-06-19 18:06

【摘要】：銅鎳合金具有良好的耐蝕性,廣泛應(yīng)用于各種海洋工業(yè)部門(mén)。但長(zhǎng)時(shí)間在海水的侵蝕下,合金還是會(huì)發(fā)生嚴(yán)重的腐蝕。向介質(zhì)中添加緩蝕劑是防止金屬腐蝕的一種簡(jiǎn)單高效的方法。然而大多數(shù)傳統(tǒng)緩蝕劑都是環(huán)境有害的。氨基酸作為一種環(huán)境友好型緩蝕劑,曾被用作抑制鋼,鋁等金屬腐蝕。本文選取了含硫原子的一種氨基酸(甲硫氨酸),作為Cu-10 wt.%Ni合金在3.5 wt.%Na Cl溶液的緩蝕劑。采用電化學(xué)阻抗譜,動(dòng)電位極化曲線,循環(huán)伏安法研究了所選緩蝕劑的緩蝕行為,通過(guò)傅里葉變換紅外光譜和掃描電子顯微鏡分析了試樣表面成分及形貌,研究其作用機(jī)理。為了提高其緩蝕效率,選擇硅酸鈉和磷酸鈉兩種無(wú)機(jī)緩蝕劑與之復(fù)配,探討協(xié)同效果及作用機(jī)理。主要的研究成果如下:(1)單獨(dú)添加甲硫氨酸對(duì)Cu-10 wt.%Ni合金在3.5 wt.%Na Cl溶液具有一定的緩蝕效果。在濃度為40 ppm時(shí)緩蝕效率達(dá)到最大,為60%。屬于陰極型緩蝕劑,通過(guò)抑制陰極吸氧反應(yīng)來(lái)控制整體的腐蝕過(guò)程。對(duì)浸泡后的表面膜層進(jìn)行SEM分析,可以發(fā)現(xiàn),表面形成膜層,但較疏松,只能一定程度上抑制氯離子的侵襲。(2)在3.5 wt.%Na Cl溶液同時(shí)添加甲硫氨酸和硅酸鈉對(duì)Cu-10 wt.%Ni合金的緩蝕具有協(xié)同作用。添加20 ppm甲硫氨酸與20 ppm硅酸鈉復(fù)配,緩蝕效率達(dá)到90%。復(fù)配緩蝕劑仍屬于陰極型緩蝕劑。協(xié)同效果是由于兩種緩蝕劑分子相互作用,在合金表面生成了平整,致密的膜層,能夠有效的抵御氯離子的侵襲。(3)在3.5 wt.%Na Cl溶液中同時(shí)添加甲硫氨酸和磷酸鈉對(duì)Cu-10wt.%Ni合金的緩蝕行為具有良好的協(xié)同作用。當(dāng)添加40 ppm甲硫氨酸與200 ppm磷酸鈉復(fù)配,緩蝕效率達(dá)到最大,為98%,大于兩種緩蝕劑單獨(dú)使用時(shí)的緩蝕效率。復(fù)配緩蝕劑屬于混合型緩蝕劑,既能抑制陽(yáng)極反應(yīng),又能抑制陰極吸氧反應(yīng)。SEM結(jié)果表明,同時(shí)添加兩種緩蝕劑,能夠形成多種遮蔽性化合物,綜合兩種膜層的優(yōu)勢(shì),使之相互配合,形成了致密又較厚的膜層,從而發(fā)揮協(xié)同效果。
[Abstract]:Copper-nickel alloy has good corrosion resistance and is widely used in various marine industries. However, under the erosion of seawater for a long time, the alloy will still have serious corrosion. Adding corrosion inhibitor to medium is a simple and efficient method to prevent metal corrosion. However, most traditional corrosion inhibitors are harmful to the environment. Amino acids, as an environmentally friendly corrosion inhibitor, have been used to inhibit corrosion of steel, aluminum and other metals. In this paper, an amino acid containing sulfur atom (methionine) was selected as corrosion inhibitor for Cu-10 wt.%Ni alloy in 3.5 wt.%Na Cl solution. The corrosion inhibition behavior of the selected corrosion inhibitor was studied by electrochemical impedance spectroscopy, potentiodynamic polarization curve and cyclic volt-ampere method. The surface composition and morphology of the sample were analyzed by Fourier transform infrared spectroscopy and scanning electron microscope, and the mechanism of action was studied. In order to improve the corrosion inhibition efficiency, sodium silicate and sodium phosphate were selected to combine them, and the synergistic effect and mechanism were discussed. The main results are as follows: (1) the addition of methionine alone has a certain corrosion inhibition effect on Cu-10 wt.%Ni alloy in 3.5 wt.%Na Cl solution. When the concentration is 40 ppm, the corrosion inhibition efficiency reaches the maximum, which is 60%. It belongs to cathode corrosion inhibitor, which controls the whole corrosion process by inhibiting cathodic oxygen absorption reaction. SEM analysis of the immersed surface film showed that the film was formed on the surface, but it was loose and could only inhibit the invasion of chloride ion to a certain extent. (2) the addition of methionine and sodium silicate at the same time in 3.5 wt.%Na Cl solution had synergistic effect on the corrosion inhibition of Cu-10 wt.%Ni alloy. The corrosion inhibition efficiency was 90% when 20 ppm methionine was added with 20 ppm sodium silicate. The compound corrosion inhibitor still belongs to cathode corrosion inhibitor. The synergistic effect is that a flat and dense film is formed on the surface of the alloy due to the interaction of the two inhibitor molecules, which can effectively resist the invasion of chloride ions. (3) the addition of methionine and sodium phosphate to 3.5 wt.%Na Cl solution has a good synergistic effect on the corrosion inhibition behavior of Cu-10wt.%Ni alloy. When 40 ppm methionine and 200 ppm sodium phosphate were added, the corrosion inhibition efficiency reached the maximum (98%), which was higher than that when the two inhibitors were used alone. The composite corrosion inhibitor is a mixed corrosion inhibitor, which can not only inhibit the anodic reaction, but also inhibit the cathodic oxygen absorption reaction. The SEM results show that the addition of two corrosion inhibitors at the same time can form a variety of concealment compounds, synthesize the advantages of the two films, make them cooperate with each other, and form a dense and thick film, thus giving full play to the synergistic effect.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG174.42

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