镁合金表面镍钨合金镀层的制备及性能
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摘要
采用电沉积方法在镁合金表面制备了镍钨合金镀层。通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、硬度测试和电化学试验等方法研究了钨酸钠含量和电流密度对镀层微观组织以及性能的影响。结果表明:当电流密度一定时,随着钨酸钠含量的增加,镀层的硬度提高,但其孔隙率增加,耐蚀性下降;而当钨酸钠含量一定时,随着电流密度的增加,镀层的硬度提高,点蚀电位增大,耐蚀性略有提高;电流密度为2A/dm~2、钨酸钠质量浓度为10g/L时,制备的镀层同时具有较高的硬度和较好的耐蚀性。
Ni-W alloy coatings were prepared on the surface of magnesium alloy using electroplating method.The effects of Na2 WO_4 concentration and current density during the electroplating process on the microstructure and properties of the coatings were studied respectively,through electron scanning microscopy(SEM),X-ray diffraction(XRD),hardness testing and electrochemical testing.The results show that when the current density was constant,with the increase of sodium tungstate concentration,the hardness and porosity increased,but the corrosion resistance decreased for the coating.At the same sodium tungstate concentration,the hardness and pitting potential increased with the increase of current density,while the corrosion resistance changed slightly for the coating.When the current density was 2 A/dm~2 and the concentration of sodium tungstate was 10 g/L,the prepared coating had high hardness and high corrosion resistance.
Ni-W alloy coatings were prepared on the surface of magnesium alloy using electroplating method.The effects of Na2 WO_4 concentration and current density during the electroplating process on the microstructure and properties of the coatings were studied respectively,through electron scanning microscopy(SEM),X-ray diffraction(XRD),hardness testing and electrochemical testing.The results show that when the current density was constant,with the increase of sodium tungstate concentration,the hardness and porosity increased,but the corrosion resistance decreased for the coating.At the same sodium tungstate concentration,the hardness and pitting potential increased with the increase of current density,while the corrosion resistance changed slightly for the coating.When the current density was 2 A/dm~2 and the concentration of sodium tungstate was 10 g/L,the prepared coating had high hardness and high corrosion resistance.
引文
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[4]唐全波,黄少东,伍太宾.镁合金在武器装备中的应用分析[J].兵器材料科学与工程,2007,30(2):70-71.
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[6]李海燕,李志生,张世珍,等.镁合金的腐蚀与防护研究进展[J].腐蚀与防护,2010,31(11):878-881.
[7]徐宏妍,李智勇.AZ91D镁合金电偶腐蚀的研究[J].中国腐蚀与防护学报,2013,33(4):298-304.
[8]杨黎晖,李峻青,姜巍巍,等.镁合金表面处理技术的研究进展[J].中国腐蚀与防护学报,2008,28(5):316-318.
[9] LI J Z,SHAO Z C,ZHANG X,et al.The electroless nickel-plating on magnesium alloy using NiSO4·6H2O as the main salt[J].Surface Coat Technology,2006,200(9):3010-3015.
[10] QUIROGA ARGANARAZ M P,RIBOTTA S B,FOLQUER M E,et al.The electrochemistry of nanostructured Ni-W alloys[J].Journal of Solid State Electrochemistry,2013,17(2):307-313.
[11]李晓闲,张雪辉,刘坚锋.电沉积镍钨合金的应用及研究现状[J].上海有色金属,2010,31(2):88-93.
[12]孔德军,吴泳忠,王晓峰.电镀法制备晶态Ni-W合金镀层摩擦与磨损性能[J].中南大学学报(自然科学版),2012,43(9):3472-3476.
[13]杨文,王晓东.非晶态Ni-W合金镀层电沉积影响因素和特性的研究[J].腐蚀科学与防护技术,1998,10(3):159-162.
[14]姚素薇,王宏志,桂枫.电沉积Ni-W纳米梯度镀层[J].天津大学学报,2000,33(4):526-529.
[15]周婉秋,郭鹤桐,姚素薇.电沉积镍-钨非晶态合金及其耐蚀性[J].材料保护,1996,29(11):6-9.
[16]徐扬,邹勇,栾涛.化学镀镀层孔隙率对电化学行为的影响及其量化评价[J].功能材料,2013,44(6):903-904.
[17] CHIPATECUA Y L,OLAY J J,ARIAS D F.Corrosion behaviour of Cr N/Cr multilayers on stainless steel deposited by unbalanced magnetron sputtering[J].Vacuum,2012,86(9):1396-1397.
[18] AHN S H,YOO J H,KIM J G,et al.On the corrosion behavior of multilayered WC-Ti1-xAlxN coatings on AISI D2steel[J].Surface Coat Technology,2003,163/164:611-619.