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    A Metal Cleaning Test Using Radioactive Stearic Acid as Soil

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    A metal cleaning test method, in which radioactive stearic acid is used as the soil, is described. Procedures are given for producing a uniform, reproducible, abraded surface on steel test pieces, and for applying very thin, uniform reproducible films of tagged stearic acid to the surface of metal test disks. Descriptions are given of special apparatus used in preparation and coating of metal test pieces. Test data are given showing the removal from steel of the stearic acid soil by single-component alkali solutions, with variation in cleaning time and solution concentration, and by one organic detergent solution, with variation in cleaning time. Distinct differences were found in the rate of soil removal and the amount of residual soil left by the different cleaning solutions when used for still cleaning at 90 C. With each cleaning solution, the residual soil on a test specimen tended to reach an equilibrium value after a certain period of cleaning and did not decrease further with increased cleaning times. With a particular alkali solution, variation of the concentration over the range 0.1 to 1.0 per cent Na2O had little effect on cleaning results (2 min immersion at 90 C), but increasing the concentration above 1.0 per cent Na2O caused a very pronounced decrease in cleaning efficiency.

    Author Information:

    Hensley, J. W.
    Wyandotte Chemicals Corp., Wyandotte, Mich.

    Skinner, H. A.
    Wyandotte Chemicals Corp., Wyandotte, Mich.

    Suter, H. R.
    Wyandotte Chemicals Corp., Wyandotte, Mich.

    Committee/Subcommittee: D12.16

    DOI: 10.1520/STP46764S