Table 5 The effect of heat treatment on the corrosion of a 10 2 P electroless nickel deposit in 10 hydrochloric acid

Heat

Deposit

Corrosion

treatment

hardness,

rate

HVjoo

^m/yr

mil/yr

None

480

15

0.6

190 °C (375 °F) for 11 h 2

500

20

0.8

290 °C (550 °F) for 6 h

900

1900

75

290 °C (550 °F) for 10 h

970

1400

55

340 °C (650 °F) for 4 h

970

900

35

400 °C (750 °F) for 1 h

1050

1200

47

0 0

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