Cracking after plating on chrome plating often happened, this because of many reason. To make a metal can prevent to corrosion resistance afforded by thicker decorative chromium deposits was made by the introduction of "duplex" or "dual" chromium plating procedure. But more thick of the result on chromium plating there is a risk can result of cracking on the plating.
The duplex chromium plate provides a convenient means of increasing the thickness and obtaining a micro-cracked plate with existing equipment, as well as combining the properties of different types of coatings. The most commonly used duplex system is a first plate of bright crack free chromium with good coverage and adequate thickness in recesses. The thickness of the two deposits generally ranges from 0.75 to 2.5 micro meter, the specifications usually calling for a minimum of at least 0.8 micrometer.
The need for a minimum thickness, about 0.75 micrometer, to get micro-cracking bring with it a need for good plate distribution into recesses in order to avoid unduly prolonged plating times.
