Specifications
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Surface
| Corrosion Protective |
| Phosphating |
| This is the standard surface treatment usually applied to carbon steel disc springs; this finish is usually sufficient to prevent corrosion in unexposed applications and during transportation and storage. However in applications where the disc springs will be subjected to the elements a higher level of protection would be required.Put spring into phosphate solution containing manganese, iron, zinc, and the method of the metal surface to form a water-insoluble phosphate film called phosphate. Phosphate film appearance was dark gray, gray or dark gray, not shiny. The thickness of the phosphate film is generally 10 ~ 15µm. Salt spray test is generally from 48 hours to 72 hours. |
| Mechanical Zinc Plating |
| A mechanical plating process that allows a substantial thickness of zinc to be applied to the surface of the disc spring without the risk of hydrogen embrittlement associated with normal electroplating. A passivation would then be applied to seal the plating. The layer thickness is around 12µm, and salt spray test is around 120 hours. |
| Chemical Nickel Plating |
| Chemical nickel plating also know as electroless nickel plating is a high quality coating that is wear-resistant and decorative while providing protection against corrosion. Specific process means, under certain conditions, an aqueous solution of metal ions is a reducing agent, and to a solid substrate surface precipitation process. The layers with a thickness of 15 to 30µm. |
| Geomet Coating / Daromet Coating |
| This is an inorganic silver-grey metallic coating of zinc and aluminium flakes in a chromatic compound. Dacromet-treated springs exhibit excellent resistance in a salt spray test. With the usual processing technology there is absolutely no possibility of hydrogen embrittlement. The layer thickness is around 5µm, and salt spray test is around 200 hours. |