Continuous Clarifying the Causes of a Corrosive Phenomenon and a Countermeasure of a Corrosive Phenomenon at Metering Rolls

摘要

Recently, many gate roll coat machines are applied for Newsprint machines and middle grade paper machines with market requirements of color printing of newspapers and magazines. The chromium plating is applied for the metering rolls because of a superior characteristic for wear resistance and anti-corrosion in a long year. But the corrosion trouble occurred in the few metering rolls of newsprint machines and publication grade machines.We study about a corrosive phenomenon from a viewpoint of expansion of the micro crack. We added the corrosive testing with mini plant size of dynamic testing device. We tried to find out the best couples of plating kinds to reduce electrolytic corrosion with measuring the polarization curve and natural potential.