Need to test the corrosion resistance of your material, protective coating or a product?
In collaboration with our partners we can evaluate the corrosion performance of your substrates by testing them in environments that simulate conditions in real applications.
Contact us if you are interested in corrosion testing!
CORROSION TESTING BY IMMERSION is one of the cheapest and easiest methods to evaluate the corrosion performance of a material, product or a protective coating. In this test the samples are kept in a container with a sufficient amount of corrosive species (e.g. salt water) and the progress of corrosion is monitored over a longer time span. Usually the samples are photographed before, during and after the test in order to get a more accurate feedback. Also, the weight of the samples can be measured in order to determine the amount of lost material due to corrosion. The selection of the corrosive environment is usually chosen based on the application of the material and one of the most common ones is a 5% NaCl solution, which is used to simulate a moist salty environment (e.g. seawater). However, often it is necessary to test the corrosion behavior of the sample in various environments to map its potential applications and in that case immersion tests can also be done in acidic or alkaline solutions. Normally the tests can last from minutes to thousands of hours, depending on the tested materials and the corrosive environment. The immersion tests can An example result of such a test series can be seen here.
SALT SPRAY TESTS are carried out in specially designed test chambers that provide a good control over the corrosive environment (e.g. temperature and moisture). These tests are more expensive than immersion tests but they provide with similar results and the corrosion processes can be significantly accelerated by increasing the temperature. One of the most common tests used for studying the corrosion of materials in moist salty environments is the ISO 9227 salt spray test that can last up to 1000h. Similarly to immersion tests, the samples are photographed before and after the test and if necessary then also the weight is measured.
ELECTROCHEMICAL CORROSION TESTS are favored due to the quick feedback about the corrosion behavior of a material or coating. Immersion and salt spray tests can last hundreds, if not thousands of hours and in some cases this is not an option. Electrochemical tests on the other hand can give results already in a matter of hours and this is extremely useful when studying a large set of different samples. In most cases electrochemical corrosion tests are in good agreement with immersion and salt spray tests but the corrosion behavior may differ.