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Do you know the test method for the cleanliness of the spring surface?

Author: Time:2019-07-23Pageviews:99

The spring metal outer coating and the organic coating should be satisfactorily coated (plated) with fine and uniform layers and strong bonding with the substrate. In the coating (plating) layer, for example, the coating (plating) layer is dropped, bubbling or fading, and part of the coating layer is not coated, and most of the cases are caused by unclean appearance before metal coating (plating). Compared with organic solvent coatings, water-based metal coating treatments such as electroplating, anodizing, phosphating, and water-based coatings are more sensitive to organic contamination of metal surfaces, even monolayer contamination. Things can cause the entire process to fail. Therefore, the cleanliness of the data before the coating (plating) is critical is the pole spring and the profiled spring.

The spring metal outer coating and the organic coating should be satisfactorily coated (plated) with fine and uniform layers and strong bonding with the substrate. In the coating (plating) layer, for example, the coating (plating) layer is dropped, bubbling or fading, and part of the coating layer is not coated, and most of the cases are caused by unclean appearance before metal coating (plating). Compared with organic solvent coatings, water-based metal coating treatments such as electroplating, anodizing, phosphating, and water-based coatings are more sensitive to organic contamination of metal surfaces, even monolayer contamination. Things can cause the entire process to fail. Therefore, the cleanliness of the data before the coating (plating) is critical is the pole spring and the profiled spring.


Method: 1. Visual inspection and optical method


The oil on the shiny metal exterior can be investigated with the naked eye and with a magnifying glass or optical microscope. The defect is that the passive oxide film of the metal surface and the extremely thin oil stain are not visible. For the rough and non-shiny metal appearance, the above method is not enough, but it can be scrubbed with clean, white cotton, cloth, paper, and then investigated whether it is clean to determine whether the metal appearance is clean.


2, appearance tension method


According to the influence of the appearance of oil on its appearance, whether the metal is moisturized in a series of test liquids with different external tensions to determine its appearance energy, according to which the cleanliness of its appearance is judged. For example, a series of solutions prepared from 80% acetic acid 20% water) (V/V, the same below) to 1% ethanol 99% water, the external tension increased from 24.5×10-5N/CM to 66.0×10-5N. /CM.


3, paint method


The degreaser is dripped on the metal exterior and then evaporated to dryness. If there is no trace, the appearance of the exterior metal is clean. If the ring is present, the presence of oil is indicated.


4, wetting method


The clean metal appearance is hydrophilic, so it can be completely wetted by water. When the metal surface contains oil, it will show a water-breaking area that is not moistened by water. Based on the principle of whether it is hydrophilic, in addition to the most commonly used exhalation method and nebulizer spray method, there are the following detection methods. Since the oxide film of the metal is also hydrophilic, and thus the memory spring, most of these methods cannot detect whether the oxide film of the metal surface is retreated.


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