Al 1050 at a load of 5 kg

Sample Variant

Depth of indentation (µm)

Depth after removal (µm)

Vicker Hardness (N/mm²)

Duplex nickel + Hexavalent chromium

42

32

5255.102

Duplex nickel + Hexavalent chromium + electroless nickel undercoat

55

52

3064.463

Duplex nickel + Trivalent chromium

52.5

40

3363.265

Duplex nickel + Trivalent chromium + electroless nickel undercoat

58

46

2755.648

Sample Variant

Al 6061 at a load of 5 kg

Vicker Hardness (N/mm²)

Duplex nickel + Hexavalent chromium

38

32

6419.668

Duplex nickel + Hexavalent chromium + electroless nickel undercoat

48

36

4023.438

Duplex nickel + Trivalent chromium

39

33

6094.675

Duplex nickel + Trivalent chroium + electroless nickel undercoat

58

52

2755.648