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Why are cast iron castings difficult to plate than other steel parts?

Release time:2019-09-12 17:26:15 

Cast iron parts have a surface that is often rugged and porous, and only a rough and porous coating is obtained on such a surface. In addition, on the surface of the pig iron, free graphite is present, which not only affects the bonding between the plating layer and the base metal, but also, in the case of pores in the plating layer, it becomes the cathode of the corroded battery, causing rapid destruction of the plating metal. The graphite in the pig iron sometimes has the effect of reducing the hydrogen overvoltage, causing hydrogen to easily precipitate there, hindering the deposition of the metal, so that the cast pig iron parts are more difficult to plate than other steel parts.

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