Abstract
This chapter discusses surface preparation and treatment techniques of metals. Chemical treatments are usually most effective with aluminum alloys, especially when long-term environmental exposure is required. The sulphuric acid-dichromate etch or FPL etch, named after Forest Products Laboratory, US Department of Agriculture, has been used successfully for many decades. FPL paste etch is used for secondary bonding of parts that contain previously bonded areas, for repair of assemblies or when the size of parts makes immersion impractical. The anodization process is sometimes used for bare (nonclad) aluminum machined or chem-milled parts that must be protected against corrosion. Anodic coatings include chromic, sulfuric, and phosphoric acid types. Brush Plate Bond Etch (Stylus Method) This method of electrochemical surface preparation is not broadly known but has been effectively applied for small batch runs where tanks and other capital-intensive methods might have been used. Acetic Acid-Hydrochloric Acid Method
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