Corrosion Data on Galvanneal Steel
Do you have any data comparing corrosion performance between galvanneal and pickled hot-rolled steel?
Q. I am the engineering manager at my plant and would like to reduce our manufacturing costs by changing our transformer material from galvanneal to pickled hot-rolled steel. Do you have any data comparing corrosion performance between these two materials? Both items will be post-painted with a powder coating. A.N.
A. The corrosion resistance of galvanneal-treated steel is considered far superior to pickled hot-rolled steel, but I have no data in my archives to support this. This kind of information usually is generated by manufacturers, metal pretreatment suppliers and steel mills, so I suggest you contact your pretreatment supplier. Remember that the hot-rolled steel also will have to be pretreated before powder coating. Although it won’t provide the same level of corrosion protection as galvanneal, I would recommend a zinc phosphate pretreatment.
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Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.