Metal powder coating quality focuses on protection, aesthetics, and durability. Key requirements:
Appearance: Uniform thickness (60–120μm), no defects (runs, pinholes), color/gloss matching standards (ΔE≤1.5), full edge coverage.
Mechanical properties: Hardness ≥H (pencil test), abrasion resistance (Taber ≤50mg loss/1000 cycles), flexibility (2mm bend without cracks), impact strength (50cm drop without damage).
Adhesion: Cross-cut test (0/1 grade, ISO 2409), pull-off ≥5MPa (ISO 4624).
Corrosion resistance: Salt spray (NSS): 48–96h indoor, 240–1000h outdoor; acid/alkali/oil resistance.
Weathering: UV aging (500–2000h, ΔE≤5, gloss retention ≥80%).
Special functions: Food-safe (FDA/LFGB), electrical insulation (≥10kV), high-temp resistance (150–300℃).
Process control: Proper pretreatment (degrease/phosphating), quality powder, optimized spraying (40–90kV, 150–300mm distance), curing (160–220℃, 10–20min).
Standards: GB/T, ISO, ASTM. Ensures long-term performance and client satisfaction
