Friction Performance Optimization of Chemically Deposited Ni-P-W Coating Using Taguchi Method

Table 1

Design factors and their levels.

Design factors	Unit	Levels
		1	2	3
Concentration of source of nickel (nickel sulfate solution) (A)	g/L	20	25^a	30
Concentration of reducing agent (sodium hypophosphite solution) (B)	g/ L	14	17^a	20
Concentration of source of tungsten (sodium tungstate) (C)	g/ L	15	20^a	25
Annealing temperature (D)	^°C	400	500^a	600

aInitial condition.