Electroless Ni–Mo–P composite coatings with or without ultrasonic field were successfully deposited. The Sodium molybdate concentration was changeable to receive various Mo and P contents. Compared with the absence of ultrasound field, the coatings obtained smoother surface and higher Mo and P contents. The microhardness was determined by Vickers diamond indentation. The results showed that the hardness improved with increasing molybdenum and phosphorus content. The sample revealed the optimum hardness (886 HV) as it possesses 8 wt-% of Mo and 14 wt-% of P. Furthermore, the coatings exhibited higher hardness under ultrasound field. The corrosion resistance was analysed by potentiodynamic polarisation. The results showed that the corrosion resistance was enhanced in the increase of molybdenum. The sample with the highest Mo content (10 wt-%) showed the best corrosion resistance (5.81 μA cm−2). In addition, the coatings with ultrasound field have an influence on improving the corrosion resistance of the coating.
MalloryGO, HadjuJB.Electroless plating: Fundamentals and Applications. Orlando (FL
): American Electroplaters and Surface Finishers Society; 1990; 1–57.
2.
AbdelAA, HanaaB, HassanMA, Nanostructured Ni-P-TiO2 composite coatings for electrolytic oxidation of small organic molecules. J Electroanal Chem. 2008;619:17–25. doi: 10.1016/j.jelechem.2008.03.004
3.
YuanZ, LiangS, ZhuoL.Pre-treatment and electroless NiâP deposition for surface-modification of tungsten fibres. Surf Eng. 2016;33(5):348–352. doi: 10.1080/02670844.2016.1235007
4.
PetrovaM, NonchevaZ, DobrevaE.Electroless deposition of diamond powder dispersed nickel-phosphorus coatings on steel substrate. Trans Inst Met Finish. 2011;89:89–94. doi: 10.1179/174591911X12971865404438
5.
HuJ, FangL, LiaoXL.Influences of different reinforcement particles on performances of electroless composites. Surf Eng. 2016;33(5):362–368. doi: 10.1080/02670844.2016.1230975
6.
SelvakumarA, PerumalrajR, JeevananthanPNR.Electroless NiPâMWCNT composite coating for textile industry application. Surf Eng. 2016;32(5):338–343. doi: 10.1080/02670844.2015.1104102
7.
ChouYH, BaiCY, GeerMD, Studies on Ni–Mo–P coatings by electroless deposition. Key. Eng. Mater. 2008;364:333–339.
8.
PalaniyappaM, SeshadriSK.Structural and phase transformation behaviour of electroless Ni-P and Ni-W-P deposits. Mater Sci Eng A. 2007;460:638–644. doi: 10.1016/j.msea.2007.01.134
9.
BalarajuJN, RamanN, ManikandanathNT.Nanocrystalline electroless nickel poly–alloy deposition: incorporation of W and Mo. Trans Inst Met Finish. 2013;92:169–176. doi: 10.1179/0020296713Z.000000000123
10.
LarhzilH, CisseM, TouirR, Electrochemical and SEM investigations of the influence of gluconate on the electroless deposition of Ni-Cu-P alloys. Electrochim Acta. 2007;53:622–628. doi: 10.1016/j.electacta.2007.07.023
11.
WuY, LiuH, ShenB, The friction and wear of electroless Ni–P matrix with PTFE and/or SiC particles composite. Tribol Int. 2006;39:553–559. doi: 10.1016/j.triboint.2005.04.032
12.
TaiFC, WangKJ, DuhJG.Application of electroless Ni-Zn-P film for under-bump metallization on solder joint. Scr Mater. 2009;61:748–751. doi: 10.1016/j.scriptamat.2009.06.024
13.
BalarajuJN, EzhilSelviV, GripsVKW, Electrochemical studies on electroless ternary and quaternary Ni-P based alloys. Electrochem Acta. 2006;52:1064–1074. doi: 10.1016/j.electacta.2006.07.001
14.
TalalA, AbdullahA, AbdullahAM.Effect of accelerators and stabilisers on crystallinity of binary and ternary electroless nickel alloys. Int J Nano Biomater. 2009;2:42–51. doi: 10.1504/IJNBM.2009.027696
15.
BayesM, SinitskayaI, SchellK, The relationship between phosphorous content and physical properties of electroless nickel deposits. Trans Inst Met Finish. 1991;69:140–144. doi: 10.1080/00202967.1991.11870910
16.
BalarajuJN, JahanSM, RajamKS.Studies on autocatalytic deposition of ternary Ni-W-P alloys using nickel sulfamate bath. Surf Coat Technol. 2006;201:507–512. doi: 10.1016/j.surfcoat.2005.11.131
17.
LiaoY, ZhangST, DryfeR.A study of corrosion performance of electroless Ni–P and Ni-W-P coatings on AZ91D magnesium alloy. Mater Werkst. 2011;42:833–837. doi: 10.1002/mawe.201100850
18.
WuFB, TienSK, ChenWY, Microstructure evaluation and strengthening mechanism of Ni–P–W alloy coatings. Surf Coat Technol. 2004;177:312–316. doi: 10.1016/j.surfcoat.2003.09.010
19.
BalarajuJN, RajamKS.Surface morphology and structure of electroless ternary Ni-W-P deposits with various W and P contents. J Alloys Compd. 2009;486:468–473. doi: 10.1016/j.jallcom.2009.06.173
20.
RanganathaS, VenkateshaTV, VathsalaK.Electroless Ni-W-P Coating and Its Nano-WS2 Composite: Preparation and Properties. Ind Eng Chem Res. 2012;51:7932–7940. doi: 10.1021/ie300104w
21.
BalarajuJN, RamanN, ManikandanathNT.Nanocrystalline electroless nickel poly–alloy deposition: incorporation of W and Mo. Trans Inst Met Finish. 2013;92:169–176. doi: 10.1179/0020296713Z.000000000123
22.
SuslickK.The chemical effects of ultrasound. Scientific American. 1989;260(2):80–86. doi: 10.1038/scientificamerican0289-80
23.
CobleyAJ, MasonTJ, SaezV.Review of effect of ultrasound on electroless plating processes. Trans Inst Met Finish. 2011;89(6):303–309. doi: 10.1179/174591911X13170500147670
24.
VasylyevMA, MordyukBN, SidorenkoSI.Corrosion of 2024 alloy after ultrasonic impact cladding with iron. Surf Eng. 2017;34(10):1–6.
25.
TudelaI, ZhangY, PalM, Ultrasound-assisted electrodeposition of nickel: Effect of ultrasonic power on the characteristics of thin coatings. Surf Coat Technol. 2015;264:49–59. doi: 10.1016/j.surfcoat.2015.01.020
26.
XuX, CuiZD, ZhuSL, Preparation of nickel-coated graphite by electroless plating under mechanical or ultrasonic agitation. Surf Coat Technol. 2014;240(7):425–431. doi: 10.1016/j.surfcoat.2013.12.070
27.
CobleyAJ, AbbasB, HussainA.Improved electroless copper coverage at low catalyst concentrations and reduced plating temperatures enabled by low frequency ultrasound. Int J Electrochem Sci. 2014;9(12):7795–7804.
28.
KoiwaI, UsudaM, YamadaK, Effect of heat-treatment on properties of electroless–deposited nickel–molybdenum–phosphorus alloy films. J Electrochem Soc. 1988;135(3):718–726. doi: 10.1149/1.2095730
29.
BoninL, BainsN, VitryV, Electroless deposition of nickel-boron coatings using low frequency ultrasonic agitation: Effect of ultrasonic frequency on the coatings. Ultrasonics. 2017;77:61–68. doi: 10.1016/j.ultras.2017.01.021
30.
GebertA, RothS, OswaldS.Passivity of polycrystalline NiMnGa alloys for magnetic shape memory applications. Corros Sci. 2009;51(5):1163–1171. doi: 10.1016/j.corsci.2009.02.016
31.
FernandesR, PatelN, MiotelloA.Dehydrogenation of Ammonia Borane with transition metal-doped Co–B alloy catalysts. Int J of Hydrogen Energy. 2012;37(3):2397–2406. doi: 10.1016/j.ijhydene.2011.10.119
32.
ZhangM, MuS, GuanQ.A high anticorrosive chromium-free conversion coating prepared with an alkaline conversion bath on electroless Ni–P coating. Appl Surf Sci. 2015;349:108–115. doi: 10.1016/j.apsusc.2015.04.209
33.
KazimierczakH, MorgielJ, SwiatekZ.Effect of Mo addition on corrosion of Zn coatings electrodeposited on steel. Corro Sci. 2018;135:107–119. doi: 10.1016/j.corsci.2018.02.039
34.
LuYC, ClaytonCR.An XPS study of the passive and transpassive behavior of molybdenum in deaerated 0.1 M HCl. Corro Sci. 1989;29(8):927–937. doi: 10.1016/0010-938X(89)90085-1
35.
LuG, ZangariG.Corrosion resistance of ternary Ni-P based alloys in sulphuric acid solutions. Electrochim Acta. 2003;47(18):2969–2979. doi: 10.1016/S0013-4686(02)00198-6
36.
TavakoliH, KhoieSMM.An electrochemical study of the corrosion resistance of boride coating obtained by thermo-reactive diffusion. Mater Chem Phys. 2010;124(2):1134–1138. doi: 10.1016/j.matchemphys.2010.08.047
