Article
Use Of Coatings And Polyethylene For Corrosion Protection
April 5, 2010
•Article: Use Of Coatings And Polyethylene For Corrosion Protection
By EBAA Iron Sales, Inc.
One way to separate metal from an electrolyte is to coat the metal with a tightly adherent coating. There are several coatings available such as coal tar epoxy, fusion bonded epoxy, ceramic based, and fluorocarbon resins. There are also a variety of polymer and organic based coating available. Each one performs essentially the same function: prevent the metal from contacting the electrolyte. In addition to insulating a particular part from the electrolyte, the coatings also insulate the parts from each other.
In a study conducted by the Cast Iron Pipe Research Association (CIPRA), several mechanical joints were buried with various kinds of T-bolts and several types of coatings. The bolts that continuously suffered the least amount of weight loss due to corrosion were the coated or taped bolts. The bolts were made from 0.5% Cu. gray-iron and with various coatings, some applied at the factory and some field applied. Even bolts that were individually taped prior to installation were more stable than either uncoated bolts or bolts in joints wrapped in polyethylene.
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