Corrosion Test means the chemical erosion of metals and alloys as a result of ion transport under the influence of the environment in which they are located, and therefore the deterioration of their physical properties. Since non-metallic materials are also affected by environmental conditions, “Corrosion” refers to the general degradation of all products that are industrial and building materials with environmental effects.
The most important factors that increase corrosion are the nonuniformity in the metal structure, local differences in alloys, production conditions of the metal, temperature and humidity differences, local concentration differences of gases or salts dissolved in the environment with which the metal is in contact.
All materials made of metal are subject to corrosion to a greater or lesser extent during use. All mechanical properties of the corroded metal change and its strength decreases as corrosion progresses. Steam boilers, oil and natural gas pipelines, nuclear reactors, bridges, deep well pipes, ships and fixed and working metallic parts of all kinds of motor vehicles are the places where corrosion is most common and creates great danger. Thus, corrosion is a major problem in every situation. The production of corrosion resistant materials, surface coatings, additions to the environment to reduce the effectiveness of corrosive environments and the replacement of corroded parts that cannot perform their duties are considered as economic losses directly caused by corrosion.
APPLICATION STANDARDS
ASTM A262 : Standard Practices for Determining Susceptibility to Intergranular Attack in Austenitic Stainless Steels
ASTM G48: Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys Using Ferric Chloride Solution
ASTM G66 : Standard Test Method for Visual Evaluation of Exfoliation Corrosion Susceptibility of 5XXX Series Aluminum Alloys (ASSET Test)
ASTM G67: Standard Test Method for Determining the Susceptibility of 5XXX Series Aluminum Alloys to Intergranular Corrosion Based on Mass Loss After Exposure to Nitric Acid (NAMLT Test)