蓖麻油-SiO_2复合改性AZ91镁合金环氧有机涂层防腐性能研究
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摘要
采用化学浸渍法在AZ91镁合金表面制备磷酸盐转化膜,继而进行环氧有机涂层制备,在环氧涂层中,分别添加了不同用量的纳米二氧化硅(SiO_2)和蓖麻油。并对制得的蓖麻油-二氧化硅复合改性AZ91镁合金环氧有机涂层进行表征,考察了蓖麻油和纳米SiO_2加入量及两者共同改性对复合有机涂层防腐性能的影响。结果表明,在蓖麻油添加量为3%(wt,质量分数),纳米SiO_2用量为1%(wt,质量分数)条件下,两者共同改性的复合环氧有机涂层的腐蚀电位达到-0.732V,阻抗可达到220.5MΩ,对基底具有较好的防护作用。
A phosphate conversion coating and an epoxy organic coating was prepared in sequence on the surface of AZ91 magnesium alloy by chemical impregnation.Nano SiO_2 and castor oil at different amounts were added to the epoxy coating.The coating was characterized and the effect of adding quantity and their combined modification of castor oil and SiO_2 to the coating performance were tested.The results showed that when castor oil and nano SiO_2 was added at3 wt% and 1 wt% respectively,the corrosion potential of coating reached-0.732 V,the impedance value can reach220.5 MΩ,the coating had a good protective effect for substrate.
A phosphate conversion coating and an epoxy organic coating was prepared in sequence on the surface of AZ91 magnesium alloy by chemical impregnation.Nano SiO_2 and castor oil at different amounts were added to the epoxy coating.The coating was characterized and the effect of adding quantity and their combined modification of castor oil and SiO_2 to the coating performance were tested.The results showed that when castor oil and nano SiO_2 was added at3 wt% and 1 wt% respectively,the corrosion potential of coating reached-0.732 V,the impedance value can reach220.5 MΩ,the coating had a good protective effect for substrate.
引文
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[3]赵旭辉,张晓丰,唐聿明,等.AZ31镁合金的微弧氧化处理及其对粘接性能的影响[J].材料导报,2012,26(1):76-79.
[4] Zhang X,Xiao G Y,Jiao Y,et al.Facile preparation of hopeite coating on stainless steel by chemical conversion method[J].Surface and Coatings Technology,2014,240(2):361-364.
[5] Zeng R C,Lan Z D,Kong L H,et al.Characterization of calcium-modified zinc phosphate conversion coatings and their influences on corrosion resistance of AZ31alloy[J].Surface and Coatings Technology,2011,205(2):3347-3355.
[6] Phuong N V,Lee K H,Chang D,et al.Effects of Zn2+concentration and pH on the zinc phosphate conversion coatings on AZ31magnesium alloy[J].Corrosion Science,2013,74(9):314-322.
[7] Phuong N V,Moon S.Comparative corrosion study of zinc phosphate and magnesium phosphate conversion coatings on AZ31Mg alloy[J].Materials Letters,2014,122(5):341-344.
[8]明杜,舒武炳,秦卫.防腐环氧树脂粘接涂层的研究进展[J].中国胶粘剂,2011,20(7):53-57.
[9] She Z X,Wang Z W,Tan C,et al.Highly anticorrosion,selfcleaning superhydrophobic Ni-Co surface fabricated on AZ91D magnesium alloy[J].Surface and Coatings Technology,2014,251(25):7-14.
[10] Sironmani P,Muthiah S,Kuooaianpoosari M,et al.Corrosion and wear resistance behavior of nano-silica epoxycomposite coatings[J].Progress in Organic Coatings,2015,81(1):132-139.
[11] Mülazim Y,Cakmakc E,Kahraman M V.Preparation of photo curable highly hydrophobic coatings using a modified castor oil derivative as a sol-gel component[J].Progress in Organic Coatings,2011,72(9):394-401.
[12]李学良,孙炜.蓖麻油改性的水性聚氨酯涂料的制备及其防蚀性能[J].广东化工,2010,37(5):3-5.
[13]于伟岸,李青山,洪伟,等.蓖麻油改性封端型水性聚氨酯的制备及性能研究[J].聚氨酯工业,2011,26(6):35-38.
[14]吕建平,李彬,张磊,等.蓖麻油硅氧烷双重交联改善水性聚氨酯的耐水性[J].聚氨酯工业,2011,26(3):37-39.
[15] Liu L,Cui Y,Li Y,et al.Failure behavior of nano-SiO2fillers epoxy coating under hydrostatic pressure[J].Electrochimica Acta,2012,62:42-50.
[16] Zhou C L,Lu X,Xin Z,et al.Polybenzoxazine/SiO2nanocomposite coatings for corrosion protection of mild steel[J].Corrosion Science,2014,80:269-275.
[17]潘崇根,王菊华,盛建松.多功能氟碳防腐涂层的制备及其性能[J].材料科学与工程学报,2013,31(5):636-640.
[18]许蓉,谢晖,黄莉.脱水蓖麻油聚酰胺-环氧树脂体系的固化反应动力学研究[J].林产化学与工业,2009,29(2):59-62.
[19] Thakur S,Karak N.Castor oil-based hyperbranched polyurethanes as advanced surface coating materials[J].Progress in Organic Coatings,2013,76(1):157-164.
[20] Saravari O,Praditvatanakit S.Preparation and properties of urethane alkyd based on a castor oil/jatropha oil mixture[J].Progress in Organic Coatings,2013,76(4):698-704.