Metal parts treated by the trivalent chromium colored zinc passivation process are often subjected to a salt spray test (also known as a salt spray test) to evaluate their corrosion resistance. The salt spray test is an accelerated corrosion test method that is widely used to evaluate the corrosion resistance of coatings, metals and other materials in marine or saline environments.
In a salt spray test, the sample is placed in a closed test chamber, where the environment is created by spraying a brine solution containing a certain concentration of salt (usually 5% sodium chloride, sometimes the concentration and composition is adjusted according to the test criteria) to resemble an environment with a high concentration of salt in nature. This environment accelerates the corrosion process and allows the test results to show up in a shorter period of time.
For metal surfaces subjected to the trivalent chromium colored zinc passivation process, the salt spray test simulates the harsh conditions that may be encountered in actual use and quickly provides the following information:
1. Corrosion resistance of passivation layers: The corrosion resistance of plating and passivation layers will be evaluated to determine their effectiveness in protecting against salt-aggressive environments.
2. Protective life of coatings: The length of protection provided by plating and passivation is assessed by observing the time it takes for red rust to appear on the metal surface.
3. Comparison of the performance of different formulations and processes: It is possible to understand and compare the corrosion resistance of different trivalent chromium zinc passivate formulations or at different thicknesses in order to optimize the quality of the product. Bigely trivalent chromium colored zinc passivator can achieve 120 hours of salt spray.
Depending on the standard (e.g. ASTM B117, ISO 9227, etc.), the duration of the salt spray test can vary from a few hours to several hundred hours, depending on the test standard and the performance criteria to be evaluated.
Trivalent chromium colored zinc passivation process, on the one hand, we should pay attention to the salt spray performance, on the other hand, we also need to pay attention to its appearance is not good, Bigely trivalent chromium colored zinc passivator, passivation out of the film for the yellowish-green film, to meet the customer for the decorative needs of the product order.
If you are interested in trivalent chromium colored zinc passivator, please feel free to contact us.
