Effect of Al2O3 and WO3 Ceramic Additives on the Surface Morphology and Mechanical Properties of Electroless Nickel-Boron Composite Coatings Fabricated on AZ31 Magnesium Alloy

Salah Eldin K A Abdulhamid ,Fatma Kandemirli ,Ibrahim M Ghayad

doi:10.7176/cmr/11-8-05

Abstract

In the present study, synthesis and a comparison of properties (structural and mechanical) of Ni–B and Ni–B–Al 2 O 3 and Ni-B-WO 3 composite coatings have been presented to elucidate the beneﬁcial role of Al 2 O 3 or WO 3 addition in binary Ni–B coatings. The Ni–B– Al 2 O 3 and Ni-B-WO 3 coatings were synthesized by adding Al 2 O 3 or NaWO 3 powdered particles into the above mentioned Ni–B coating solution. A signiﬁcant improvement in mechanical properties has been observed by the addition of Al 2 O 3 or WO 3 additions. This novel composite coating composition will be useful for wear and corrosion applications. DOI : 10.7176/CMR/11-8-05 Publication date :October 31 st 2019

Highlights

Magnesium and its alloys are more and more applied in different sectors, including aircraft, motor vehicle as well as metallurgical, chemical and electrical industries
Magnesium alloys are very attractive as structural materials mostly in applications where weight saving is of great concern
Aluminum has a strong passivation tendency in presence of oxygen and results in the precipitation of β phase, which is highly cathodic with respect to the matrix [1,2]

Summary

Introduction

Magnesium and its alloys are more and more applied in different sectors, including aircraft, motor vehicle as well as metallurgical, chemical and electrical industries. 0.5 g/l Nano Al2O3 additive enhanced the deposition of Ni-P on AZ91 magnesium composite and the same results have been observed in case of SiO addition. Et al [13] proposed a new electroless Ni-B coating in which nano size diamond particles (UDDUltra dispersive diamond) are added to after doing Ni-B coating to improve hardness and wear resistance properties of the coating. Et al [14] applied electroless Ni-P-W, Ni-P-W / Al2O3 composite coatings on the hot-rolled, strip casted AZ91(%9 Al, %1 Zn) magnesium plates and investigated the effect of applied coating on the corrosion resistance. The present paper investigates the Effect of Al2O3 and WO3 Ceramic Additives on the Mechanical Properties of Electroless Nickel Composite Coatings

Experimental The experimental work was preceded as follows

Results and Discussion

Conclusions