Double plating for improved corrosion resistance.

The multilayering of hard chrome plating improves corrosion resistance by reducing the penetration of microcracks. It is effective when you want to keep costs down.

Hard chrome plating is not only excellent in wear resistance but is also sometimes applied to protect the surface of iron from rust; however, its corrosion resistance is not perfect. This is due to the presence of microcracks, which are tiny cracks that are not visible to the naked eye, on the surface of the hard chrome plating. Some of these microcracks penetrate all the way from the surface to the base material. Therefore, while hard chrome plating does not corrode when exposed to humid environments that are prone to condensation or environments with strong corrosive gases, corrosion factors can reach the base material through the cracks, and once corrosion begins in the base material itself, it can ultimately lead to the plating peeling off from the base material. For this reason, there are cases where the use of chrome plating for rust prevention is abandoned due to the usage environment; however, there are actually methods to improve corrosion resistance. One such method is to create a multilayered hard chrome layer. By reapplying plating after the chrome plating finish, the number of microcracks that penetrate to the base material can be reduced, thereby enhancing corrosion resistance. Nickel plating is also a method to improve corrosion resistance, but it is not suitable for environments that corrode nickel, such as those with ozone; thus, the technology of multilayering chrome plating is adopted as a countermeasure.

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