Microns thin. Conductive. Paint-ready.
Chromate conversion (chem film) forms a clear protective coating by chemical reaction with the aluminium surface — no electrolysis, negligible dimensional change, and a surface that stays electrically conductive.
We process Type II clear coatings using SurTec 650 — a trivalent, hexavalent-chromium-free chemistry qualified to MIL-DTL-81706 and listed on QPL-81706. The finish is clear, not the iridescent yellow of older hex-chrome films — applied by immersion after all machining, forming and heat treatment is complete. Parts are cleaned to a water break-free surface before coating; no iron-bearing abrasives ever touch the work.
It's the standard pre-treatment under paint and primer systems, and the standard finish where grounding, bonding or EMI shielding rules out anodising.
Maximum corrosion protection
For parts painted or unpainted where corrosion resistance is the priority. The standard base for primer and paint systems.
Low electrical resistance
A thinner coating for corrosion protection where electrical contact matters — grounding points, bonding surfaces, EMI/RFI shielding.
Verified the way the spec demands.
PROCESS CONTROL PANELS · 3 × 10 IN · RUN WITH PRODUCTION HARDWARE THROUGH ALL PRE- AND POST-TREATMENT
Where chem film is called out.
Sequence matters.
Conversion coating is applied after all heat treatment, forming, machining, brazing and welding. Mixed-metal assemblies are masked or processed as detail parts. Envelope to 2600 × 600 × 900 mm.