Optimization of Multiple Roughness Characteristics of Chemically Deposited Ni-P-W Coating Using Weighted Principal Component Analysis

Table 2

Design factors and their levels.

Design factors	Unit	Levels
		1	2	3
Concentration of source of nickel (nickel sulphate 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 solution) (C)	g/L	15	20^a	25

aInitial-coating condition.