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Phosphating film grain size

磷化膜晶粒度 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.
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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