ASTM B117 is a test method that determines the conditions, apparatus, and procedure required to create and maintain the salt spray test environment. The final results of the test method are expressed in SI units.
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Introduction to ASTM B117
ASTM B117 is a test method designed to cover the requirements for establishing and maintaining a salt spray test environment. The relative corrosion resistance information related to a controlled corrosion environment for specimens of metals and coated metals is provided by this method. The results obtained are specially used for quality control and specification purposes.
The ASTM B117 test method is generally applicable to metals and provides information about the performance, variability among the specimens, correlation, and extrapolation of corrosion. Variability is observed by testing similar specimens in different fog chambers under specified ranges.
ASTM B117 Test Method
This test method proceeds with cleaning the specimens and coating them for protection. The specimens are then placed in a salt spray chamber containing the salt solution. The specimens are placed such that they do not come in contact with each other or any other metallic material. The salt solution from one specimen should also not come in contact with the solution from another specimen. Towards the end of the experiment, the specimens are removed from the chamber, cleaned, and inferences are drawn on the basis of observation.
Preparation of salt solution
The salt solution is prepared by dissolving 5 parts of the mass of sodium chloride in 95 parts of water. Sodium chloride used is assured to be free of impurities and anti-caking agents because they can act as corrosion inhibitors. The pH of the salt solution is maintained and the salt solution is then placed in the salt spray chamber. The air is supplied to the air saturator tower at sufficient pressure. The atomization, quantity of fog, and temperature inside the chamber are maintained.
Exposure of the specimen to salt solution
The process of exposure is continuous and the chamber is closed after placing the specimens in it. The period of exposure depends on the specifications covering the material or product being tested. The specimens are removed toward the end of the test and cleaned in running water proceeding with a clear and immediate examination.
ASTM B117 Specimens
Specimen details
ASTM B117 specimens must be solid and uniformly rectangular.
Specimen dimensions
The general sample size for ASTM is decided as per the material or product being exposed or is mutually agreed upon between the purchaser and the seller.
Specimen preparation
Specimens are molded or cut from molded or extruded sheets or plates. They are cleaned and prepared for coating.
ASTM B117 Results
This test method provides information about the type of salt and water used, readings of temperature within the exposure zones, pH of the collected solution, concentration or specific gravity of the collection solution, exposure period, and the results of all inspections. The results vary with the type of specimen, specimen depth, temperature, atmospheric conditions, control of the operating variables, and evaluation criteria selected.
Tests Related to ASTM B117
ASTM G85 is similar to ASTM B117 and is a cyclic corrosion test that uses a solution of sodium chloride and ammonium sulfate. It evaluates paints on steel.
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