Metal Finishing Guide Book


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Page 266 of 903

corrosion and ultraviolet protection as a single-coat finish; anodic electrocoats with cure capabilities below 200��F; two-coat electrocoat systems for ultimate primer plus topcoat performance; exceptional coverage of sharp metal edges; decorative clear electrocoats that can be water-white or tinted to simulate plating; and photoimageable electrocoats. ELECTROCOAT LIMITATIONS As with any coating process, electrocoat has inherent limitations and is not suited for all applications. Low production levels of multiple colors favor other coating application methods over electrocoat, which requires a separate tank and postrinse system for each color. High production levels, however, can economically favor the use of multiple electrocoat tanks to handle different colors. Initial capital outlays for an electrocoat system are often higher than for other types of coating methods such as dip or liquid spray. Justification of the capital to install an electrocoat system has become easier with advances in more efficient 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. 261

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