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Table 1 Main coating parameters with their levels

From: Parametric optimization of corrosion and wear of electroless Ni-P-Cu coating using grey relational coefficient coupled with weighted principal component analysis

Design factors Levels
1 2 3
Concentration of source of nickel (nickel sulphate solution) (g/l) 25 30 35
Concentration of reducing agent (sodium hypophosphite solution) (g/l) 10 15 20
Concentration of source of copper (copper sulphate) (g/l) 0.3 0.5 0.7
Heat treatment temperature (°C) 300 400 500