Your clients may have faced various types of zipper problems related to its durability, colourfastness, dimension measurements, strength, operability etc. Among these, zipper corrosion is one problem that is majorly experienced. Hence, a quality corrosion testing is a must for achieving happy customers.


Salt Spray Test – Preventing Corrosion

To assure high corrosion resistance for your zipper production you must conduct a corrosion test or salt spray test by using a standardized ‘Salt Spray Chamber’. It is a common test module to analyse the resistance of particular specimen and their surface coatings towards corrosion. This method is popularly used in a range of industries as it is faster and way more economical in comparison with other test methods. Specifically metallic, stone and ceramic materials or those coated with corrosion protection layer are tested. It is considered important in the industries where metal components are utilized during the manufacturing process.

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This test is conducted inside a chamber where NaCl (salt) solution is sprayed on the specimen to be tested under pressurised air. The highly corrosive environment is formulated inside the chamber which indeed allows the manufacturer to observe the products’ behaviour in particular circumstances. The time taken for the test depends on the material tested. Chamber volumes or salt water solutions to be used can vary, depending on the material to be tested.

Corrosion Testing in Zipper Industry

Salt spray test is used by zipper manufacturers to evaluate the corrosion resistance of zippers and zipper accessories. It is also utilized for analysing the quality of zipper coatings and the zipper performance when they are subjected to certain conditions. This test is not meant for nylon coil and delrin zippers. It is only applied to electroplated sliders and metal zippers.

The zippers to be tested are exposed to a 5 percent salt spray solution between 33oC to 36oC and placed in the salt spray chamber for 24 hours. This period stimulates 1 year of the natural environment. After 24 hours, the zippers are taken out of the chamber and analysis are conducted through visual inspection.

The common standards for salt spray test are ASTM B117, ASTM D2059, ISO9227 and SBS (QS-QA-054).

Points to remember while subjecting a zipper to Salt Spray Test:

  • Two copy of specimens must be prepared, one of which will not be exposed to the test and will act as the control copy.
  • The test must be conducted with the zipper opened for 1/2 of its length and hung from the rod inside the chamber in a vertical position.
  • The zipper specimen when taken out after the completion of the test, must be rinsed under the tap water (at room temperature). Excess water must be blown off through a stream of air.

Get more details on salt spray chamber and its technical specifications, click here.