镍-钴-纳米氧化铝复合电刷镀层在NaCl溶液中的腐蚀行为
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摘要
采用电刷镀技术在45钢上制备了Ni-Co-纳米Al_2O_3复合镀层,镀液组成和工艺条件为:NiSO_4·7H_2O 100～125 g/L,CoSO_4·7H_2O 50g/L,NiCl_2·6H_2O 40g/L,HCOOH 18g/L,CH_3COOH 48g/L,盐酸150g/L,硫酸肼0.1g/L,纳米Al_2O_3 20g/L,正接,电压10～12V,镀笔速率5～8m/min,时间30min。通过塔菲尔曲线测试、电化学阻抗谱分析和浸泡腐蚀试验对比了电刷镀Ni-Co合金镀层、Ni-Co-纳米Al_2O_3复合镀层和挂镀硬铬层在5%NaCl溶液中的耐蚀性。结果表明,Ni-Co-纳米Al_2O_3复合镀层表面平整、均匀、致密,纳米Al_2O_3均匀分布,耐蚀性优于Ni-Co合金镀层和硬铬镀层,有望取代硬铬镀层在中性腐蚀环境中的应用。
A Ni-Co-nano-alumina composite coating was prepared on 45 steel substrate by electro-brush plating in a bath comprising NiSO_4·7 H_2O 100-125 g/L, CoSO_4·7 H_2O 50 g/L,NiCl_2·6 H_2O 40 g/L, HCOOH 18 g/L,CH_3COOH 48 g/L,hydrochloric acid 150 g/L, hydrazine sulfate 0.1 g/L, and nano-Al_2O_3 20 g/L with a positively charged electrode at a voltage of 10-12 V and a moving rate of 5-8 m/min for 30 min. The corrosion resistance of Ni-Co alloy coating, Ni-Co-nano-Al_2O_3 composite coating, and hard chromium coating in 5% NaCl solution were compared by Tafel curve measurement,electrochemical impendence spectroscopy analysis, and immersion corrosion test. The results showed that the Ni-Co-nano-Al_2O_3 composite coating was smooth, uniform, and compact with nano-Al_2O_3 particles distributed evenly, and had better corrosion resistance than the Ni-Co alloy and hard chromium coatings. The composite coating is expected to replace the application of hard chromium coating in neutral corrosive environments.
A Ni-Co-nano-alumina composite coating was prepared on 45 steel substrate by electro-brush plating in a bath comprising NiSO_4·7 H_2O 100-125 g/L, CoSO_4·7 H_2O 50 g/L,NiCl_2·6 H_2O 40 g/L, HCOOH 18 g/L,CH_3COOH 48 g/L,hydrochloric acid 150 g/L, hydrazine sulfate 0.1 g/L, and nano-Al_2O_3 20 g/L with a positively charged electrode at a voltage of 10-12 V and a moving rate of 5-8 m/min for 30 min. The corrosion resistance of Ni-Co alloy coating, Ni-Co-nano-Al_2O_3 composite coating, and hard chromium coating in 5% NaCl solution were compared by Tafel curve measurement,electrochemical impendence spectroscopy analysis, and immersion corrosion test. The results showed that the Ni-Co-nano-Al_2O_3 composite coating was smooth, uniform, and compact with nano-Al_2O_3 particles distributed evenly, and had better corrosion resistance than the Ni-Co alloy and hard chromium coatings. The composite coating is expected to replace the application of hard chromium coating in neutral corrosive environments.
引文
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[23] WANG X H, LU B, HU Z F, et al. Effects of n-Al_2O_3 particles content on structure and performance of electro-brush plating Ni-Co alloy composite coatings[J].Rare Metal Materials and Engineering, 2016, 45(1):36-41.
[24]汪笑鹤,徐滨士,胡振峰,等.n-Al_2O_3/Ni-Co纳米复合电刷镀层表面形貌的分形维数研究[J].电镀与涂饰,2010, 29(11):33-36.
[2]陈贵清,陈小刚.冷硬铸铁活塞杆电镀硬铬工艺生产研究[J].热加工工艺,2013, 42(12):141-143.
[3]邓云,吕镖,汪笑鹤,等.柔性摩擦辅助电镀致密铬镀层的工艺研究[J].电镀与涂饰,2016, 35(19):1021-1024.
[4] HOUDKOVA S,ZAHALKA F, KASPAROVA M, et al. Comparative study of thermally sprayed coatings under different types of wear conditions for hard chromium replacement[J]. Tribology Letters, 2011, 43(2):139-154.
[5] PICAS J A, FORN A,MATTHAUS G. HVOF coatings as an alternative to hard chrome for pistons and valves[J]. Wear, 2006, 261(5/6):477-484.
[6] WANG L P, GAO Y, XUE Q J, et al. A novel electrodeposited Ni-P gradient deposit for replacement of conventional hard chromium[J]. Surface and Coatings Technology, 2006, 200(12/13):3719-3726.
[7] KOSTA I,IMAZ N,CINCA N,et al. Pulse plated Co-P alloy as substitute for hard chromium electrodeposits[J]. Transactions of the Institute of Metal Finishing, 2012, 90(5):252-258.
[8]杨眉,田小梅,张万里,等.W-Ni-Fe合金镀层与硬铬镀层耐磨性的对比试验[J].电镀与精饰,2010,32(9):27-30.
[9] MULUKUTLA M, KOMMINENI V K, HARIMKAR S P. Pulsed electrodeposition of Co-W amorphous and crystalline coatings[J]. Applied Surface Science, 2012, 258(7):2886-2893.
[10] BINII W. Brush plating:recent property data[J]. Metal Finishing, 1997, 95(6):88, 90-93.
[11] VANEK D. An update on brush plating[J]. Metal Finishing, 2002, 100(7):18-20.
[12] CLARKE R D. DALIC selective brush plating and anodising[J]. International Journal of Adhesion and Adhesives, 1999, 19(2/3):205-207.
[13]惠文华,张远明,张谨平,等.代铬刷镀层耐腐蚀性能的研究[J].腐蚀科学与防护技术,1994, 6(3):274-278.
[14] HUI W H, LIU J J, CHAUG Y S, et al. A study of wear resistance of a new brush-plated alloy Ni-Fe-W-S[J]. Wear, 1996, 192(1/2):165-169.
[15]张远明.Ni-Fe-W-P合金镀层结合强度的研究[J].材料保护,2004, 37(1):4-5, 8.
[16]兰新武.Ni-Co合金镀层的制备及其应用于汽车缸套的可行性分析[J].电镀与环保,2017,37(1):25-28.
[17] SHETTY A R, HEGDE A C. Ultrasound induced multilayer Ni-Co alloy coatings for better corrosion protection[J]. Surface and Coatings Technology, 2017,322:99-107.
[18]苏峰华,刘灿森.脉冲电沉积制备的纳米晶钴-镍合金薄膜的摩擦学性能[J].润滑与密封,2014,39(3):18-21.
[19]郑炜铭,庄哲峰,戴品强,等.电刷镀纳米晶Ni-Co合金镀层组织结构与性能的研究[J].福州大学学报(自然科学版),2010, 18(1):90-94.
[20]刘霁云,赵阳,董世运,等.脉冲电刷镀Ni-Co镀层及其硬度的研究[J].表面技术,2018, 47(1):218-223.
[21] DU L Z, XU B S, DONG S Y, et al. Preparation, microstructure and tribological properties of nano-Al_2O_3/Ni brush plated composite coatings[J]. Surface and Coatings Technology, 2005, 192(2/3):311-316.
[22] WU B, XU B S, ZHANG B, et al. Preparation and properties of Ni/nano-Al_2O_3 composite coatings by automatic brush plating[J]. Surface and Coatings Technology, 2007,201(16/17):6933-6939.
[23] WANG X H, LU B, HU Z F, et al. Effects of n-Al_2O_3 particles content on structure and performance of electro-brush plating Ni-Co alloy composite coatings[J].Rare Metal Materials and Engineering, 2016, 45(1):36-41.
[24]汪笑鹤,徐滨士,胡振峰,等.n-Al_2O_3/Ni-Co纳米复合电刷镀层表面形貌的分形维数研究[J].电镀与涂饰,2010, 29(11):33-36.