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Mixing bead blasting with anodizing is common, but be cautious with the order of operations. Typically, bead blasting is done before anodizing to create a consistent matte finish. Blasting after anodizing could wear down the anodized layer and affect the corrosion resistance or color uniformity. Also, if you’re masking for chem-film, double-check that the masking tape or material won’t leave residue that interferes with the anodizing or blasting. A test part might help avoid surprises.

[F. Pereira]

My project requires a combination of chem-film for electrical conductivity in specific areas, anodizing for enhanced corrosion resistance, and bead blasting for a uniform matte appearance. My challenge is to effectively communicating these requirements on the technical drawing to ensure the finishing process is executed correctly without any misinterpretations by the finisher. My current plan is to apply a chem-film layer selectively on certain mounting points and edges that require grounding, while the rest of the part will undergo anodizing. Additionally, I want a bead-blasted matte finish applied to the entire visible surface, except for the masked chem-film areas.

For those who’ve dealt with similar requirements, what’s the best way to call out these finishes on the drawing? I’m thinking of using distinct masking symbols or a detailed finishing note but would appreciate any advice on standard practices or recommendations. Also, is there any concern with bead blasting over anodized sections in terms of wear or appearance consistency? Thank you!

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[CommunityMember]

For marking the requirements on the drawing, I’ve had success using distinct area callouts with separate finish symbols for each process. You can define masked areas for chem-film using hatching or boundary lines, and include a detailed legend that explains what each symbol or line style indicates. Additionally, adding a table that references specific zones for each finish with masking specs and tolerances helps clarify things for the finisher.

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[Bjorn]

Mixing bead blasting with anodizing is common, but be cautious with the order of operations. Typically, bead blasting is done before anodizing to create a consistent matte finish. Blasting after anodizing could wear down the anodized layer and affect the corrosion resistance or color uniformity. Also, if you’re masking for chem-film, double-check that the masking tape or material won’t leave residue that interferes with the anodizing or blasting. A test part might help avoid surprises.

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