In one batch of nickel (Ni)-plated cast iron components, you observed that there were minute pores...

In one batch of nickel (Ni)-plated cast iron components, you observed that there were minute pores in the Ni surface coating growing down to the cast iron surface.Should you allow this batch of nickel (Ni)-plated cast iron components be used for a water treatment application? Will the component be susceptible to corrosion and what form of corrosion could occur?

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Expert Solution

Generally, the Corrosion of aluminum and its alloys in natural waters usually caused by the presence of harmful metal ions in solution like copper, lead, mercury.

Nickel deposition from hypophosphite containing baths has been used for providing corrosion protection to ferrous alloys. Nickel coating functions as a barrier against corrosive chemicals. The presence of pits and pores on the coating is detrimental to its corrosion resistance. so as the batch having pores growing down to cast iron surface there may be a chance of starting of corrosion. therefore the batch will not be allowed for used in water treatment application.

these components will be susceptible to corrosion and possible type of corrosion in cast iron due to improper coating is graphitic corrosion or graphitization.Graphitisation tends to penetrate into the metal but at a slower rate.

samet mamat answered 2 years ago

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