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Test Item | Phosphating film grain size |
| Purpose | Detection of the quality of the phosphating film | |
| Test Range | Coating, coating, chemical film, etc。 |
The grain size of the phosphating film is an important evaluation index in the phosphating process. We have rich experience in the evaluation of the phosphating film.
| Test method and standard |
One, appearance inspection: the naked eye observation phosphating film should be uniform, continuous, compact crystal structure. There should be no residual blank or rust stains on the surface. Due to the different method and effect of the former treatment, allowing the emergence of color and color of the phosphating film, but not allowed to appear brown.
Two, corrosion resistance test
1.Immersion method: sodium chloride solution after phosphating sample immersed in 3%, was removed after two hours, the surface without rust is qualified. The corrosion resistance of the phosphating film is better when the corrosion time is longer.
2.Drop method: at room temperature, the blue dot reagent is on the phosphating film, and the color change time is observed. Phosphating film thickness is different, different color time. Thick film, 5 minutes, medium film, 2 minutes, 1 minutes.
Two, corrosion resistance test
1.Immersion method: sodium chloride solution after phosphating sample immersed in 3%, was removed after two hours, the surface without rust is qualified. The corrosion resistance of the phosphating film is better when the corrosion time is longer.
2.Drop method: at room temperature, the blue dot reagent is on the phosphating film, and the color change time is observed. Phosphating film thickness is different, different color time. Thick film, 5 minutes, medium film, 2 minutes, 1 minutes.
| Test Item | Standard/Method | Remark |
| Coating composition analysis | Electron microscope and scanning | |
| Micro morphology analysis | Electron microscopic observation | |
| Phosphating film grain size | Electron microscopic observation | Observation of grain distribution of phosphate film |
| Phosphating corrosion analysis | Mosaic, metallography | Observation on the corrosion of the substrate |
| Coating thickness analysis | metallographic phase | |
| electric mirror | ||
| Field thickness analysis | Coating thickness gauge |
| Laboratory |
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