退火处理对AZ31镁合金表面Ni-Mo-P镀层组织与耐腐蚀性能的影响
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摘要
为了进一步提高镁合金表面Ni-Mo-P镀层的耐蚀性,采用OM、XRD和浸泡试验等方法,研究了退火处理对AZ31镁合金表面Ni-Mo-P镀层组织与腐蚀性能的影响。结果表明:AZ31镁合金阳极氧化-化学镀Ni-Mo-P镀层表面为"胞状"组织,随着退火温度的升高或退火时间的延长,AZ31镁合金阳极氧化-化学镀Ni-Mo-P镀层的胞状组织逐渐细化,但镀层厚度降低,同时,非晶态Ni-Mo-P镀层组织逐渐向晶态转变,350℃退火1.0 h具有较高的非晶化程度,退火处理后的Ni-Mo-P镀层由Mg、MgO、Mg_2SiO_4、Ni和Ni3P组成;退火使AZ31镁合金阳极氧化-化学镀Ni-Mo-P镀层耐蚀性降低,350℃退火1.0 h镀层具有相对较好的耐蚀性,这与镀层的厚度和非晶化程度有关。
In order to improve the corrosion resistance of Ni-Mo-P coating on the surface of AZ31 magnesium alloy,the effect of heat treatment on the microstructure and corrosion resistance of Ni-Mo-P coating on the surface of AZ31 magnesium alloy was studied by optical microscopy,X-ray diffractometer and immersion test. Results showed that the surface of anodized-electroless Ni-Mo-P coating of AZ31 magnesium alloy presented a"cell-like"structure. With the increase of annealing temperature or the extension of holding time,the cell structure of anodized-electroless Ni-Mo-P coating on AZ31 alloy was gradually refined,but the thickness of coating decreased. Meanwhile,the Ni-Mo-P coating changed from amorphous state to crystalline state. When treated at 350 ℃ for 1.0 h,the coating had higher degree of amorphous state,and the Ni-Mo-P coating after annealing treatment was composed of Mg,MgO,Mg_2SO_4,Ni and Ni3 P. Besides,annealing treatment reduced the corrosion resistance of anodized-electroless Ni-Mo-P coating of AZ31 magnesium alloy,and the sample treated at 350 ℃ for 1 h had better corrosion resistance,which was related to the thickness of coatings and the degree of amorphous state.
In order to improve the corrosion resistance of Ni-Mo-P coating on the surface of AZ31 magnesium alloy,the effect of heat treatment on the microstructure and corrosion resistance of Ni-Mo-P coating on the surface of AZ31 magnesium alloy was studied by optical microscopy,X-ray diffractometer and immersion test. Results showed that the surface of anodized-electroless Ni-Mo-P coating of AZ31 magnesium alloy presented a"cell-like"structure. With the increase of annealing temperature or the extension of holding time,the cell structure of anodized-electroless Ni-Mo-P coating on AZ31 alloy was gradually refined,but the thickness of coating decreased. Meanwhile,the Ni-Mo-P coating changed from amorphous state to crystalline state. When treated at 350 ℃ for 1.0 h,the coating had higher degree of amorphous state,and the Ni-Mo-P coating after annealing treatment was composed of Mg,MgO,Mg_2SO_4,Ni and Ni3 P. Besides,annealing treatment reduced the corrosion resistance of anodized-electroless Ni-Mo-P coating of AZ31 magnesium alloy,and the sample treated at 350 ℃ for 1 h had better corrosion resistance,which was related to the thickness of coatings and the degree of amorphous state.
引文
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[3]王目孔,孙建新,刘新超.铸造镁合金研究与应用进展[J].有色金属工程,2012(2):56-59.
[4]李瑛,余刚,刘跃龙,等.镁合金的表面处理及其发展趋势[J].表面技术,2003,32(2):1-5.
[5]王明,邵忠财,仝帅.镁合金表面处理技术的研究进展[J].电镀与精饰,2013,35(6):10-15.
[6]GRAY J E,LUAN B.Protective coatings on magnesium and its alloys-a critical review[J].Journal of Alloys and Compounds,2002,336:88-113.
[7]许诗源,郝维慧,刘楚明,等.ZK60镁合金表面化学镀镍[J].兵器材料科学与工程,2015,38(1):85-89.
[8]张贤,胡建文,张楠,等.AZ91HP镁合金化学镀镍磷及镀层性能研究[J].表面技术,2016,45(12):73-77.
[9]ZULETA A A,CORREA E,Casta1o J G,et al.Study of the formation of alkaline electroless Ni-P coating on magnesium and AZ31B magnesium alloy[J].Surface and Coatings Technology,2017,321:309-320.
[10]胡荣,陈英敏.含缓蚀剂的镁合金化学镀镍溶液及其所得镀层性能的研究[J].电镀与涂饰,2017,36(11):572-576.
[11]宿辉,王慧文.镁合金化学镀镍的研究进展[J].电镀与涂饰,2018,37(9):411-417.
[12]邱敬东,贾素秋,关景鑫.以磷酸盐-高锰酸钾体系化学转化作为前处理的AZ91D镁合金化学镀镍工艺[J].电镀与涂饰,2014,33(15):644-647.
[13]王朋,刘宏,吕媛媛,等.化学沉积Ni-Mo-P和NiP镀层退火晶化组织及耐蚀性[J].表面技术,2015,44(10):7-15.
[14]张翼,方永奎,段吉国.非晶态Ni-Mo-P镀层的组织结构与晶化过程[J].金属热处理,2003,28(3):28-32.
[15]WANG M,YANG Z,ZHANG C,et al.Growing process and reaction mechanism of electroless Ni-Mo-P film on Si O2substrate[J].Transactions of Nonferrous Metals Society of China,2013,23:3629-3633.
[16]林翠,赵立才.TC4钛合金表面化学镀Ni-P合金耐磨层研究[J].稀有金属材料与工程,2013,42(3):507-512.
[17]张信义.化学镀Ni-Mo-P合金镀层的结构及耐蚀性能[J].机械工程材料,1997,21(1):23-25.
[18]孔德军,付贵忠.5052铝合金表面化学镀Ni-P镀层的组织与性能[J].中国有色金属学报,2012,22(5):1 360-1 364.