Cross-industry surface finishing coordinated with forming and precision machining, from optical light-absorbing treatments to magnesium e-coating.
Combine the final appearance and surface function with the substrate and dimensional requirements. Our capabilities include appearance-grade micro-arc oxidation, magnesium e-coating, conversion coatings and optical light-absorbing treatment.
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72–96 h neutral salt spray (NSS) · RoHS compliant
Test conditions and acceptance criteria are confirmed for each project.
Review the substrate, masking areas, appearance and functional requirements together. Contact our team to discuss corrosion, electrical or optical requirements and the appropriate verification method.
JWJ connects forming, precision machining, pretreatment, specialized surface finishing and inspection around the finished component. We address how each stage affects the next, helping customers coordinate dimensional, appearance and functional requirements within one manufacturing route.
With JWJ’s developed micro-arc oxidation process, applicable components can achieve the required appearance directly after micro-arc oxidation, without additional spray painting or other surface finishing. This reduces downstream finishing stages and the coordination they require.
For optical components, a machined shape still needs the specified surface function. Plan light-absorbing areas separately from precision fits, protect the mating surfaces that need masking, and review the optical requirement and surface condition alongside the machining route.
Casting quality, machined surfaces, pretreatment and coating conditions all affect the finished appearance. JWJ combines process-integration capability with practical high-acceptance-rate experience in magnesium e-coated appearance parts.
The challenge is to deliver consistent appearance, adhesion and fit on an active metal substrate. JWJ coordinates forming, machining, pretreatment, e-coating, curing and inspection, with practical high-acceptance-rate experience in magnesium appearance parts.
Magnesium is chemically active. Surface films, residual contamination and the condition left by machining can change the interface on which a coating forms. A suitable, repeatable pretreatment is fundamental to adhesion.
E-coating deposits charged coating material under an electric field. Hydrogen evolution during deposition can leave pores in a wet film. Deposition and curing therefore need to be considered together when controlling pinholes and appearance.
Coating cannot substitute for control of the substrate. Exposed pores, tool marks and local surface changes need attention before coating, especially where cast and machined areas meet on a visible surface.
A visually uniform finish must coexist with functional interfaces. Define visible areas, edges, recesses, masking and coating allowances together, then align appearance samples and the required adhesion or corrosion checks.
Review the geometry and final finish together: identify critical dimensions, visible surfaces and functional interfaces; agree the appearance reference and relevant tests. This makes upstream manufacturing decisions serve the finished part, and gives the team a shared acceptance target.
