Type of chromium coatings onto aluminium substrates

First critical load (N)

Second critical load (N)

Duplex nickel/Hexavalent chromium onto Al 1050

70

130

Duplex nickel/Trivalent chromium onto Al 1050

85

135

Duplex nickel/Hexavalent chromium onto Al 6061

22

72

Duplex nickel/Trivalent chromium onto Al 6061

25

70