The corrosion test is broadly used and executed quality control test in the quality assurance laboratory of metal business. The mentioned test is done in a salt spray chamber. The test is done on ferrous metals and alloys.
Additionally, this is done in paint and coating industry to ensure the quality of coating which says to deliver long run performance for ferrous metals. The corrosion phenomenon may be an ignoring topic to discuss, but has many difficult effects on the ferrous metal. The salt laden environment where we people live, and the materials, are seen to casually react with iron and initiate an oxidation reaction which converts ferrous ions into ferrous oxide.
With passing time, this reaction leads to the destruction of the product fully. The oxidation of the material also helps microbial reaction to happen and this leads to a complete destruction and malfunctioning of the product. To avoid these circumstances, the paint and coating industry are trying to improve their product and the durability of their coating. This happens because the coated layer can restrict the entry of moisture or any contaminant and lead to corrosion. Also, the low quality coating may get remove by exposing the surface to moisture and leading to oxidation. So, the quality of coating need to be tested using artificial accelerated salt spray test.
But before starting on it, you should understand how salt spray chamber works. It is important that the test should be conducted in the right way. A corrosion test chamber simulates the salt laden condition inside and that even in an accelerated way. Begin preparing specimen. The specimen can be a fastener or can be a thin metal plates which are covered with paint. If it is a fastener or something i.e not flat like bolts, are hanged by typing them with a thread and then with a very thin rod. The rod with which the nuts and bolts are hanged are later kept in chamber as hanging only. If the specimen is flat like meta sheets or plates they can be easily fixed on the specimen carrier zone of the chamber with a specified angle.
After this, the chamber is firmly closed and the parameters are set up. The user can start the test by initiating the salt fog spray and maintain the temperature, test cycle duration etc. How salt sparay chamber will work depends on the operational technique used. It’s easier and specific with no human interference and controls are digitalized or HMI based.
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