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氨基酸對(duì)7B50鋁合金在1 mol/L NaCl+0.1 mol/L HCl溶液中緩蝕性能的影響
發(fā)布人：上海艾荔艾金屬材料有限公司www.bt990.com.cn
更新時(shí)間：2015-12-03
采用靜態(tài)失重法與電化學(xué)阻抗譜評(píng)價(jià)4種氨基酸對(duì)7B50超高強(qiáng)度鋁合金在1 mol/L NaCl+0.1 mol/L HCl溶液中的緩蝕行為，并通過(guò)腐蝕形貌表征氨基酸的緩蝕機(jī)理。
氨基酸對(duì)7B50鋁合金在1 mol/L NaCl+0.1 mol/L HCl溶液中緩蝕性能的影響Effect of inhibition properties of several amino acids oncorrosion property of 7B50 aluminium alloy in1 mol/L NaCl+0.1 mol/L HCl
采用靜態(tài)失重法與電化學(xué)阻抗譜評(píng)價(jià)4種氨基酸對(duì)7B50超高強(qiáng)度鋁合金在1 mol/L NaCl+0.1 mol/L HCl溶液中的緩蝕行為，并通過(guò)腐蝕形貌表征氨基酸的緩蝕機(jī)理。結(jié)果表明：氨基酸濃度越高、溫度越低，氨基酸對(duì)鋁合金的緩蝕效率就越高。添加氨基酸后，溶液中鋁合金的表觀活化能均增大，其中，半胱氨酸(Cys)和蛋氨酸(Met)的表觀活化能最高，這歸因于—SH或—SCH3基團(tuán)對(duì)鋁合金表面優(yōu)良的吸附作用。在4種氨基酸中，0.05 mol/L半胱氨酸(Cys)中含—SH基團(tuán)的緩蝕效率最高，室溫下高達(dá)94.7%；Met的次之，主要是由于—SCH3的空間位阻效應(yīng)所致；苯丙氨酸(Phe)的緩蝕性能較差；低濃度的組氨酸(His)緩蝕能力相對(duì)不佳，而高濃度的His在較高溫下仍保持著較高的緩蝕效率，這說(shuō)明His的緩蝕效率受溫度的影響較小。因此，His相應(yīng)的表觀活化能也較低。浸泡實(shí)驗(yàn)后的金相結(jié)果表明：添加氨基酸后會(huì)不同程度地抑制鋁合金的晶間腐蝕和點(diǎn)蝕。
The inhibition behavior of four amino acids for 7B50 aluminium alloy was investigated using the mass loss measurement and electrochemical impedance spectroscopy technique. The corrosion mechanism of amino acid was characterized by corrosion morphologies. The results show that the inhibition efficiency increases with the increase of concentration and the decrease of temperature. The apparent activation energies of aluminium alloys in the presence of amino acids are larger than that of the sample immersed in the blank solution. The apparent activation energies of cysteine(Cys) and methionine (Met) are highest due to the excellent adsorption ability of —SH or —SCH3?groups on the surface of aluminium alloy. The inhibition efficiency of 0.05 mol/L Cys at low temperature is best among these four studied amino acids, e.g., the inhibition efficiency of Cys is 94.7% at room temperature. Met is also S–containing amino acids, but its inhibition efficiency is lower than that of Cys due to the steric hindrance effect. In addition, relatively lower inhibition efficiency is achieved for phenylalanine (Phe). Histidine (His) with low concentration has very bad inhibition performance, however, at higher temperatures, relatively good corrosion inhibition capability of His with high concentration is shown up gradually. The effect of temperature on the inhibition efficiency of Histidine (His) is little. Consequently, the apparent activation energy of Histidine (His) is lower than other amino acids. The corrosion morphologies show that the intercrystalline corrosion and pitting corrosion of aluminium alloys are inhibited in the presence of amino acids.
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