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Finishing Guide

Aluminum Die Casting Surface Finishes

The right finish depends on alloy chemistry, cosmetic class, grounding, corrosion exposure, masking and the dimensions that must remain controlled after coating.

Read the Selection ConclusionView Aluminum Die Casting
Selection conclusion

Define function and the finished surface.

  1. Function — Define exposure, grounding and the required surface role.
  2. Boundaries — Mark cosmetic faces, masking zones and before/after-finish dimensions.
  3. Approval — Agree color, gloss, reference samples and test criteria.
Engineering guidance

Finish Selection Matrix

Choose the finish from the functional requirement first, then define appearance and test criteria.

FinishPrimary purposeDrawing considerations
Powder coatingDurable color and outdoor protectionMask threads, gasket lands and grounding zones
Conversion coatingCorrosion protection and electrical continuityDefine chemistry, color and contact resistance
Wet paint / e-coatControlled appearance or complex coverageSpecify adhesion and corrosion test
PlatingSpecial wear, shielding or appearanceConfirm alloy compatibility and thickness
AnodizingAppearance and surface protectionHigh-silicon cast alloys may show color variation
Engineering guidance

Cosmetic Acceptance

A finish name alone does not define acceptable appearance. Mark A-surfaces and concealed surfaces on the drawing, agree color and gloss samples, and define limits for flow marks, ejector evidence, porosity and rack contact.

Engineering guidance

Dimensioning After Finish

Coating buildup can affect bores, threads, grounding pads and assembly interfaces. State whether dimensions apply before or after finish and identify masking boundaries with datums.

  • Coating thickness range
  • Masked features and transition lines
  • Color, gloss and texture reference
  • Adhesion, salt-spray or UV target
  • Packaging protection for cosmetic faces
Practical Answers

Frequently Asked Questions

Can die-cast aluminum be anodized?

It can, but high silicon content may produce uneven color. Confirm alloy, cosmetic expectations and sample approval before selecting anodizing.

Which finish is best for electronics housings?

Powder coating is common for appearance and durability; conversion coating may be preferred where electrical grounding or coating-free interiors matter.

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