Corrosion Control of Highway Structural Components by the Application of PowderCoatings

摘要

Three categories of coatings were selected for the test program: a solvent-basedcontrol system, 13 proprietary single-coat powder systems, and 6 two-coat powder coating systems. The coatings were evaluated over three substrates: abrasive-blasted A36 steel, abrasive-blasted A588 steel, and cold rolled A36 steel with a zinc phosphate pretreatment. Testing included a cycle salt fog/natural marine exposure, a cyclic brine immersion/natural marine exposure, a natural marine exposure test, water penetration test, anodic disbondment test, and electrochemical impedance spectroscopy tests, and coated rebar exposure in concrete.