STP887

    Testing of Engine Coolant Inhibitors by an Electrochemical Method in the Laboratory and in Vehicles

    Published: Jan 1986


      Format Pages Price  
    PDF (212K) 14 $25   ADD TO CART
    Complete Source PDF (6.1M) 14 $64   ADD TO CART


    Abstract

    An electrochemical test based on the measurement of galvanic currents has been developed for water-glycol solutions on five different metallic materials. An acidity function is first defined for ethylene glycol, propylene glycol, and water glycols, which allows comparisons to be made of their aggressiveness towards metals. Different combinations of inhibitors are tested by using the method. It is shown that the method is particularly suitable for testing aluminum: the effects of inhibitors on the behavior of the oxide layer, on pitting tendency, and on general dissolution of the metal are easily detected. The corrosion parameters may be continuously monitored by inserting the electrochemical cell into the cooling system of a car.

    Keywords:

    galvanic corrosion, aluminum, antifreeze, inhibitors


    Author Information:

    Fiaud, C
    Laboratoire de Corrosion, E.N.S.C.P., Université Pierre et Marie Curie, Paris,

    Netter, P
    Laboratoire de Corrosion, E.N.S.C.P., Université Pierre et Marie Curie, Paris,

    Tadjamoli, M
    Laboratoire de Corrosion, E.N.S.C.P., Université Pierre et Marie Curie, Paris,

    Tzinmann, M
    Laboratoire de Corrosion, E.N.S.C.P., Université Pierre et Marie Curie, Paris,


    Paper ID: STP32980S

    Committee/Subcommittee: D15.94

    DOI: 10.1520/STP32980S


    CrossRef ASTM International is a member of CrossRef.