Spring factory tutor you how to check the cleaning degree of spring

Spring factory teach you how to check the spring clean degree, spring stainless steel passivation coating and coating of organic chemistry should be considered with ( Plating) Layer of high density, symmetry, and the same thick solid crystal fusion rules. The coating ( Plating) In such coating layer ( Plating) Layer down, beat or hair flower and part without coating layer, because the metal material with most situations ( Plating) Before the surface is not clean. Compared with solvent architectural coatings, water as the solvent of spring stainless steel passivation coating solutions, such as electroplating process, anodizing, phosphating and water-based paint spraying to stainless steel passivation of organic compounds, such as environmental pollution is more sensitive, even a monolayer of air pollutants, which will cause all the processing technology is not successful. Therefore, surface coating raw materials ( Plating) After the solution before the cleanliness of particularly important. Methods: 1, estimate and electronic optics bright grease stain on stainless steel passivation can use eye and rely on to observe the magnifying glass or optical microscopy at high magnification. Its defect is passive air oxidation film of passivation of stainless steel and thin oil will check. For smooth and bright stainless steel passivation, described way looks overwhelmed, but according to clean, white cotton, cloth, paper surface swab, then observed the is neat, in order to make clear the stainless steel passivation is clean. 2, interface applanation tonometry method based on surface oil stains on the surface damage, according to the metal materials in a series of interfacial tension is not the same as in the test solution is invasion in order to make clear its surface, the distinguish the clean level of the surface. As with the acetic acid from 90% to 30% water) ( , V/V) To 1% alcohol series products are 98% water solution, the interfacial tension relatively from 24. 5×12- 5 n/CM the ascent to 66. 0×12- 5N/CM。 3, paint, in addition to the oil drops on the passivation of stainless steel, then top up, such as a trace, surface passivation of stainless steel is clean, such as a circle shows there is oily be soiled. 4, wet clean stainless steel passivation is hydrophilic, therefore, can thoroughly wet by water, when the stainless steel passivation with oily be soiled, can appear not by water invasion of water areas. Application scenario is hydrophilic this basic principle, apart from very simple common breathing and electronic cigarettes atomizer spray method, test way also has the following categories. Because air oxidation film of metal materials are hydrophilic, therefore, the most can not be tested passivation of stainless steel air oxidation film is net.
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