Metal Finishing Guide Book

2012 Organic Finishing Guidebook Issue

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Page 152 of 331

corrosion and ultraviolet protection as a single-coat finish; anodic electro- coats with cure capabilities below 200°F; two-coat electrocoat systems for ul- timate primer plus topcoat performance; exceptional coverage of sharp metal edges; decorative clear electrocoats that can be water-white or tinted to simu- late plating; and photoimageable electrocoats. ELECTROCOAT LIMITATIONS As with any coating process, electrocoat has inherent limitations and is not suit- ed for all applications. Low production levels of multiple colors favor other coat- ing application methods over electrocoat, which requires a separate tank and postrinse system for each color. High production levels, however, can eco- nomically favor the use of multiple electrocoat tanks to handle different col- ors. Initial capital outlays for an electrocoat system are often higher than for oth- er types of coating methods such as dip or liquid spray. Justification of the cap- ital to install an electrocoat system has become easier with advances in more effi- cient equipment design and closed-loop operation. Because electrocoat is a total coverage process, applications where coating is not desired on all areas of a part can be problematic. Masking of areas to be left uncoated can be costly and time consuming in production. 151

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