The ASTM G4-01 (R2014) standard guide describes how to carry out corrosion tests on plant machinery or systems while they are in use to assess the corrosion resistance of engineering materials. Electrochemical techniques for calculating corrosion rates are not covered. The average rate of corrosion, other types of attack, or both, that take place during the exposure interval can be calculated using the data from corrosion testing. This information can be used to evaluate potential building materials for use in similar services or as replacements in already-existing facilities. The manual offers general recommendations that, while primarily designed for immersion tests, can also be used to expose test specimens to plant environments, provided that their positioning and orientation don't obstruct airflow. Because corrosion rates can rise, fall, or remain constant depending on the nature of the corrosion products and the effects of the incubation period needed at the beginning of pitting or crevice corrosion, corrosion rate data derived from a single exposure may not provide information on corrosion rate change versus time. The manual adheres to NACE Standard RP0497.
,Corrosion,Corrosion Resistance,Corrosion Test,Immersion Test
