What are the key points for surface treatment before coating?
A: Degreasing → Rust removal → Phosphating/Passivation; ensure surface cleanliness and roughness to avoid oil stains and oxide scale residue that can cause coating peeling.
How to avoid color difference after coating?
A: Use uniform batches, uniform surface treatment processes, and uniform coating and curing parameters; avoid excessive differences in surface roughness.
Can it be electroplated?
A: Electroplating is possible; thorough degreasing and rust removal are required before electroplating to ensure surface cleanliness and avoid poor coating adhesion and pinholes.
How to remove surface oxide scale?
A: Cold-rolled coils have less oxide scale after normal annealing; localized oxidation can be removed by pickling and polishing; batch processing can be done using an pickling line.
What is the purpose and selection of coating?
A: To prevent scratches during transportation and processing; select low/medium/high adhesion films according to the processing method, and remove the film promptly after stamping to avoid residual adhesive.