| category | Test items | Detection method | Quality Standard |
| steel parts | Phosphating parts | Visual inspection, Thickness Gauge, etc. | The phosphating film is uniform, dense and flat, with a thickness of 1~3μm and consistent film color. No anti-rust, rough, exposed bottom, white bottom and other defects |
| Primer parts | Visual inspection, Thickness Gauge, etc. | The paint film is even and flat, with a thickness of 15~20μm, and it dries effectively without wrinkles, leaks, stains, obvious impurities or exposed edges and paint flow | |
| Finished parts | Visual inspection, Thickness Gauge, etc. | The color conforms to the process regulations, the paint film is even and smooth, generally smooth and bright, and the total thickness (including primer 30~40μm) has no obvious impurities, paint flow, wrinkles and other defects | |
| FRP parts | surface treatment | Visual inspection, hand swab | There is a certain roughness, no bubbling, oil stains, etc. The edges and corners are neat and there is no missing grinding |
| Paint layer | Visual inspection, hand swab | The color of the paint film meets the requirements, the adhesion is strong, and there are no defects such as missing coating, impurities, bubbles, etc. |
Note: According to the regulations of the Ministry of Communications on the painting quality of auto parts, the thickness of steel parts above 2.5mm does not need to be phosphating, and can be painted directly after derusting.
