In sheet metal work, the quality of a part does not depend solely on its manufacturing precision or design. Surface treatment plays a crucial role: it extends lifespan, improves aesthetic appearance, and protects against corrosion. Choosing the right treatment ensures a reliable, high-performing product adapted to its usage environment.
Main Surface Treatments in Sheet Metal Work
Treatment | Principle | Advantages | Disadvantages | Typical Applications |
|---|---|---|---|---|
Degreasing / Cleaning | Removes oils, dust, and impurities before treatment | Essential for adhesion and cleanliness | Does not provide corrosion protection on its own | Preliminary step before any treatment |
Cataphoresis (KTL) | Uniform coating by electrodeposition | Excellent coverage, good corrosion resistance, very uniform | Limited to black color, higher cost | Automotive, metal enclosures |
Electrolytic Zinc Plating | Zinc deposition by electrolysis | Good value, decent protection | Less durable than hot-dip galvanizing, sensitive to acidic environments | Technical parts, fasteners |
Anodizing (aluminum) | Controlled oxidation of aluminum | Aesthetic, wear and corrosion resistant | Only suitable for aluminum, higher cost | Design parts, electronics |
Powder Coating (epoxy/polyester) | Electrostatic application + baking | Durable, resistant, solvent-free, wide color range | Requires baking, harder to touch up | Terminals, enclosures, front panels |
Liquid Paint | Spray gun application | Very good finish, customized visual effect | Less eco-friendly (solvents), longer drying time | Aesthetic parts, small series |
Stainless Steel Passivation | Chemical cleaning that strengthens surface oxide | Improves corrosion resistance without altering appearance | Chemical process, requires specific baths | Food, medical, exposed stainless steel |
How to Choose the Right Treatment?
The choice depends on several criteria:
– Base material (steel, stainless steel, aluminum)
– Usage conditions (indoor, outdoor, humid or aggressive environment)
– Aesthetic requirements (color, finish, gloss)
– Regulatory constraints (RoHS, REACH, food-grade, etc.)
– Budget and production volume: some treatments are better suited for large series
Tips:
– Avoid closed or inaccessible areas (can cause issues with painting or galvanizing)
– Plan for drainage or hanging holes (or mounting area)
– Choose materials compatible with the treatment
– Collaborate early with the subcontractor to adapt the design plans
Our technical sales team is ready to listen to your needs.