Metal Finishing Guide Book


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Page 348 of 903

Fig. 2. Variation in internal stress, tensile strength, ductility, and hardness with pH. Watts bath 54��C (130��F) and 495 A/m2 (46 A/ft2). nickel in chemical solutions, whereas reducing conditions retard corrosion. Nickel also has the ability to protect itself against certain forms of attack by developing a passive oxide film. When an oxide film forms and is locally destroyed as in some hot chloride solutions, nickel may form pits. In general, nickel is Fig. 3. Variation in internal stress and hardness with current density. Watts bath 54OC (130OF) and pH 3. 341

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