2A12铝合金水基切削液的缓蚀和润湿性能研究

Study on Corrosion Inhibition and Wetting Performance of Water-Based Cutting Fluid for 2A12 Aluminum Alloy

为设计和制备2A12铝合金用水基切削液,确保加工后表面无锈蚀,采用响应曲面法优化配方中三乙醇胺(TEA)、十二碳二元酸(DC12)和乙二胺四乙酸(EDTA)添加量,并考察对2A12铝合金的协同缓蚀作用,引入酰胺改性植物油(AMV-1)和自乳化酯(SEE)提高配方防蚀效果,通过添加表面活性剂增强配方体系的润湿性能,最后结合红外光谱和分子结构分析阐明AMV-1和SEE缓蚀性能的构效关系。结果表明:TEA、DC12和EDTA是影响2A12铝合金腐蚀的显著性因素,TEA和DC12存在交互作用,最优添加量(质量分数,下同)分别为11.10%、1.70%和0.44%;添加8.0%(质量分数)AMV-1和2.0%(质量分数)SEE可使铝合金表面无腐蚀和变色;聚醚L44可提高配方润湿性能,当添加2.0%(质量分数)时,表面静态接触角从49.732°降至36.451°;AMV-1、SEE分别与铝合金表面形成配位化合物保护膜层和疏水膜层从而起到缓蚀效果。

In order to design and prepare water-based cutting fluid for 2A12 aluminum alloy to ensure no rust on the surface after machining,addition amounts of triethanolamine(TEA),dodecanedioic acid(DC12)and ethylenediaminetetraacetic acid(EDTA)in the formula were optimized by response surface methodology.The synergistic corrosion inhibition effect on 2A12 aluminum alloy was investigated,and the amide-modified vegetable oil(AMV-1)and self-emulsifying ester(SEE)were utilized to improve the anti-corrosive effect of the formula,and the surfactants were added to enhance the wetting performance of the formula system.At last,combined with infrared spectroscopy and molecular structure analysis,the structure-activity relationship of AMV-1 and SEE corrosion inhibition performance was clarified.Results showed that TEA,DC12 and EDTA were the significant factors affecting the corrosion of 2A12 aluminum alloy,and there was an interaction between TEA and DC12.The optimal addition amounts(mass fraction,the same below)were 11.10%,1.70%and 0.44%,respectively.Adding 8.0%(mass fraction)AMV-1 and 2.0%(mass fraction)SEE could make the aluminum alloy surface free from corrosion and discoloration.Meanwhile,polyether L44 could improve the wetting performance of the formula,and the surface static contact angle decreased from 49.732°to 36.451°with the addition of 2.0%(mass fraction).AMV-1 and SEE formed a coordination compound protective film and a hydrophobic film on the surface of aluminum alloy,respectively,to achieve corrosion inhibition effect.