Teerasak Markpin, Napachat Tareelap, Krissanapong Kirtikara and Narongrit Sombatsompop

pp. 245 - 257

Abstract

This article reports a novel design and development of electrodeposited Ni-WC coating system, and
the experimental design is discussed in detail. This experimental apparatus featured the possibilities of
rotating the cathode in the transverse and horizontal directions or rotating around the anode. The rotating
systems also had an advantage of stirring the electrolyte during the coating process. The results showed that
as the cathode rotation speed was increased from 15 to 25 rpm the particle incorporation and hardness of
the coating increased from 3.72 to 4.13% and from 577 to 631 HV, respectively. When the rotating velocity
around the anode was increased from 10 to 20 rpm the particle incorporation and hardness of the coating increased from 13.24 to 20.29% and from 1129 to 1408 HV, respectively. A decrease in thickness consistency
of the coating was observed when increasing self-rotating velocity of the cathode and rotating velocity around
the anode. Increasing current density resulted in an increase in thickness consistency with no effect on particle incorporation and hardness. In addition, increasing coating time led to increases in particle incorporation and hardness, but did not affect thickness consistency of the coating. 

Keywords

• electrodeposited composite coating
• Ni-WC
• cathode rotation