White rust is a rapid form of corrosion that attacks the zinc coating of galvanized steel, appearing as a white, powdery deposit. It occurs when the zinc is exposed to specific conditions, notably environments with poor ventilation and the presence of condensable corrosive vapors. The galvanization process is the primary anti-corrosion treatment for cable trays. The following provides a comprehensive explanation, covering standards, ranges, testing, and special application. Legrand's offer of global solutions for wiremesh cable trays (and accessories) is one of the most complete on the market. A cathodic action occurs on cut s leaned and roughened in order to achieve a good bond. After the dipping process, the surplus zinc is blown off and one obtains an extra passivating coat (an ultra-thin. This white paper briefl y describes the process and zinc coating thickness of galvanised as well as electroplated fi nishes and explains how these zinc coatings protect the underlying steel, the punched holes and sheared edges from corrosion. It concludes with analysis of a 'before and after' salt. The coating of the cable tray is treated with spray, a zinc-coating, plating of zinc, and spray and zinc-plating, cold zinc dipping, hot galvanizing, nickel zinc-plating and alloy etc.
