NACE TM0398 1998 Edition, March 27, 1998
Laboratory Corrosion Testing of Metals in Static Chemical Cleaning Solutions at Temperatures Above 100 Degrees C (212 Degrees F)
Additional Comments: WITHDRAWN NO S/S
Published By:NACE International (NACE)
This standard describes a simple test method for measuring the relative corrosiveness of solutions used for chemical cleaning in a static system at temperatures greater than 100°C (212°F). The test described is conducted with corrosion test specimens in the clean condition (ie., no deposits). The test consists of exposing metallic test specimens to cleaning solutions under controlled conditions in a test vessel. The test specimens are weighed before and after the test and the corrosion rate is calculated from the mass loss. Localized corrosion such as pitting is also evaluated. Procedures for test specimen handling and reporting of test results for a better comparison of data among laboratories are also included.
Application of this test method is limited to temperatures less than 200°C (392°F). Note that 200°C (392°F) is the upper temperature limit for most industrial cleaning solvents.
Measurements of corrosion rates in cleaning solutions obtained by this test method should not be extrapolated directly to predict corrosion rates for metal surfaces in an operating system. A number of variables encountered in the chemical cleaning of industrial equipment, such as the nature and amount of deposit, are not readily controlled and can affect corrosion of the materials exposed to the chemical cleaning solutions. The test described in this standard is designed to exclude variables that can occur when duplicating field conditions because these conditions are difficult to reproduce in the laboratory and can make agreement among different laboratories difficult to obtain. In laboratory tests, care should be taken to ensure that these conditions can be controlled and fully described, thus enabling them to be repeated in different laboratories. The measurements described in this standard give the corrosion rate of the metal under the conditions tested. Corrosion rates are useful for comparison of results among laboratories.