Paint Systems for Highway Structural Steel. A Study of Highway Structure Corrosion Problems and Metal Protective Coating Systems.

摘要

A ten-year investigation of metal protective paint systems for highway steel structures was carried out. A total of over 100paints,including 40primers,was used. Field exposure data on 501panels over a five-year period involved three test fences with various environments: (1) marine, (2) humid inland,and (3) mild urban. Parallel laboratory studies included characterization,development of an 'accelerated environmental chamber,'degradation tests,and usefulness of electrical techniques to measure capacitance-water absorption and polarization-corrosion inhibition. Ancillary studies included painted bridge panels under seacoast and inland environments and a water tank. All data were arranged for computer documentation,and input,storage,updating,retrieval,processing and special data reduction programs were developed. Galvanized steel,zinc-rich paints, a cement/oil primer with alkyd finish,zinc dust or zinc/chlor,rubber,or zinc dust oil,primer with aluminum/tung oil phenolic finish,gave superior performance under aggressive sea coast environments.