ASTM F483-09(R2020) pdf free download

ASTM F483-09(R2020) pdf free download.Standard Practice for Total Immersion Corrosion Test for Aircraft Maintenance Chemicals
1. Scope
1.1 This practice covers the determination of the corrosive- ness of aircraft maintenance chemicals on aircraft metals with time under conditions of total immersion by a combination of weight change measurements and visual qualitative determina- tion of change. 1.2 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Significance and Use
3.1 Many aircraft maintenance chemicals are used on com- ponents and structures which would be adversely affected by excessive dimensional change. This practice screens these chemicals to ensure compliance with specified weight change criteria.
4. Apparatus
4.1 Wide-Mouth Sealable Glass Jar or Stoppered Flask of Suitable Size—The glass jar or flask should be so chosen so that the specimens will remain fully immersed in a vertical position during testing and the ratio of area of immersed metal to volume of solution will be in accordance with 8.1. 4.1.1 Warning—Some aircraft maintenance chemicals when heated have high vapor pressures or may produce gases during testing. Suitable precautions should be taken to prevent the containing vessel from exploding or the vessel should be so chosen as to withstand the resulting pressure. 4.2 Specimen-Supporting Device—A glass or fluorocarbon plastic supporting system designed to keep the specimen fully immersed while ensuring free contact with the solution, and designed to isolate the specimens from each other physically. 4.3 For materials containing low boiling point solvents, a means of preventing evaporation losses shall be used. 4.4 Constant-Temperature Device—Any suitable regulated heating device (mantle, hot plate, or bath) may be used to maintain the solution at the required temperature. 4.5 Thermometer, having a range from 95 to 155 °C (203 to 311 °F) and conforming to requirements for Thermometers S67C or S67F in accordance with Specification E2251. 4.6 Oven, low temperature explosion-proof, capable of maintaining 38 6 3 °C (100 6 5 °F) through 120 6 5 °C (248 6 5 °F).
6. Test Specimens
6.1 Take test specimens ofa given alloy from the same sheet stock, which shall be in new or like-new condition, and measure 50.8 by 25.4 by 1.6 mm (2 by 1 by 0.06 in.) with a 3.2-mm (0.125-in.) diameter mounting hole suitably located at one end ofthe specimen. Test three replicate specimens in each concentration of maintenance chemical solution in accordance with 8.2.1. Take the total area of the specimen as 28.2 cm 2 (4.4 in. 2 ). 6.1.1 Identify each panel with Numbers 1, 2, 3, or 4.
7. Precleaning Test Specimens
7.1 Immerse the test specimens in a beaker of mineral spirits, Type II, conforming to Specification D235 at room temperature and swab the surface of the individual specimen thoroughly using clean forceps to hold the test specimen and the cotton swab. 7.2 Shake off excess solvent. Transfer and immerse the test specimens separately several times in a beaker of methyl n-propyl ketone. 7.3 Shake off excess methyl n-propyl ketone and dry in a vacuum desiccator or in a low-temperature oven at 120 6 5 °C (2486 5 °F) for 15 min. (If oven dried, remove to dessicator and cool to ambient.)
8. Conditioning
8.1 Ratio of Area of Immersed Metal to Volume of Solution—The ratio of area of immersed metal to volume of solution shall be 8 mL per cm 2 . Use fresh solution for each set of replicates. 8.2 Solution Concentration: 8.2.1 Unless otherwise specified, test the specimens in solutions of the maintenance chemical in the concentrated as-received condition and at the recommended use dilution using water that conforms to Specification D1193, Type IV. In case the maintenance chemical is not soluble to the extent noted, record this fact and continue with the test. 8.2.2 If water is not used as the diluent, record the type and specification of diluent used in the test. 8.3 Temperature—Unless otherwise specified, the test tem- perature shall be 38 6 3 °C (100 6 5 °F).