AZ91D镁合金表面无铬无氟前处理工艺研究
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摘要
为环境友好、低成本地提高镁合金耐蚀性能,本文以AZ91D为基体,研究了一种基于镁合金表面直接化学镀镍的无铬、无氟前处理工艺。结果表明,以100 mL/L H_3PO_4、10 g/L Na_2MoO_4为酸洗液,20 g/L NaOH、20 g/L Na_2MoO_4为活化液进行处理后,在镁合金表面得到平整、均匀、致密的Ni-P合金镀层;镀层的XRD谱图中,Mg的衍射峰消失,2θ=45°附近出现一个宽化馒头峰,镀层呈现非晶态结构;镀层的耐蚀性明显提高。
In this paper,a chromium-free and fluorine-free pretreatment process for direct electroless nickel plating on the surface of AZ91 D was studied in order to improve the corrosion resistance of magne-sium alloys for environmental friendly and low cost purposes. Results show that a smooth,uniform andcompact Ni-P alloy coating can be obtained by electroless nickel plating on magnesium alloy surface withthe following pretreatment process 100 mL/L H_3PO_4,10 g/L Na_2MoO_42H_2 O as pickling solution,20 g/LNaOH,20 g/L Na_2MoO_4 as activating solution. In the XRD spectrum,the diffraction peak of Mg is disap-peared and a broad peak is appeared near 2θ= 45°,which show that the structure of the plating is amorphous. The corrosion resistance of the plating are improved obviously.
In this paper,a chromium-free and fluorine-free pretreatment process for direct electroless nickel plating on the surface of AZ91 D was studied in order to improve the corrosion resistance of magne-sium alloys for environmental friendly and low cost purposes. Results show that a smooth,uniform andcompact Ni-P alloy coating can be obtained by electroless nickel plating on magnesium alloy surface withthe following pretreatment process 100 mL/L H_3PO_4,10 g/L Na_2MoO_42H_2 O as pickling solution,20 g/LNaOH,20 g/L Na_2MoO_4 as activating solution. In the XRD spectrum,the diffraction peak of Mg is disap-peared and a broad peak is appeared near 2θ= 45°,which show that the structure of the plating is amorphous. The corrosion resistance of the plating are improved obviously.
引文
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[8] Wang Z C,Jia F,Yu L,et al. Direct electroless nickelboron plating on AZ91D magnesium alloy[J]. Surfaceand Coatings Technology,2012,206(17):3676-3681.
[9] Lei X P,Yu G,Gao X L,et al. A study of chromiumfree pickling process before electroless Ni-P plating onmagnesium alloys[J]. Surface and Coatings Technology,2011,205(16):4058-4061.
[10] Sudagar J,Lian J S,Sha W. Electroless nickel alloycomposite and nano coatings:A critical review[J]. Jour-nal of Alloys and Compounds,2013,571(5):183-204.
[11] Zhang W X,Jiang Z H,Li G Y,et al. Electroless Ni-SnP coating on AZ91D magnesium alloy and its corrosionresistance[J]. Surface and Coatings Technology,2008,202(12):2570-2576.
[2] Li W,Kang Z X. Fabrication of corrosion resistant super-hydrophobic surface with self-cleaning property on mag-nesium alloy and its mechanical stability[J]. Surface andCoatings Technology,2014,253(9):205-213.
[3] Song G,Atrens A. Recent insights into the mechanism ofmagnesium corrosion and research suggestions[J]. Ad-vanced Engineering Materials,2007,44(9):177-183.
[4] Zhao L C,Cui C X,Wang X,et al. Corrosion resistanceand calcium-phosphorus precipitation of micro-arc oxi-dized magnesium for biomedical applications[J]. Ap-plied Surface Science,2015,330(4):431-438.
[5]陈婷婷,亢淑梅,赵超山,等. AZ91D镁合金化学沉积Ni-P合金镀层工艺研究[J].电镀与精饰,2017,39(4):5-8.
[6]宿辉,张春波,王作凯,等.镁合金表面化学镀镍前处理工艺的研究进展[J].表面技术,2017,46(9):87-94.
[7] Xie Z H,Yu G,Li T J,et al. Dynamic behavior of elec-troless nickel plating reaction on magnesium alloys[J].Journal of Coatings Technology and Research,2012,9(1):107-114.
[8] Wang Z C,Jia F,Yu L,et al. Direct electroless nickelboron plating on AZ91D magnesium alloy[J]. Surfaceand Coatings Technology,2012,206(17):3676-3681.
[9] Lei X P,Yu G,Gao X L,et al. A study of chromiumfree pickling process before electroless Ni-P plating onmagnesium alloys[J]. Surface and Coatings Technology,2011,205(16):4058-4061.
[10] Sudagar J,Lian J S,Sha W. Electroless nickel alloycomposite and nano coatings:A critical review[J]. Jour-nal of Alloys and Compounds,2013,571(5):183-204.
[11] Zhang W X,Jiang Z H,Li G Y,et al. Electroless Ni-SnP coating on AZ91D magnesium alloy and its corrosionresistance[J]. Surface and Coatings Technology,2008,202(12):2570-2576.