A program to develop an aluminum tube stock alloy for vacuum-brazed heat exchangers with improved external corrosion resistance necessitated the use of accelerated laboratory corrosion tests to rank trial materials and ultimately qualify an alloy for production and sale. Brazed radiator sections and sheet samples were exposed to a variety of ASTM standard corrosion test environments. Metallographic examination of samples thus exposed demonstrated that the SWAAT test (ASTM G85:A3) closely replicated the air-side corrosion morphology found in aluminum radiators from the field. Samples exposed in test environments other than SWAAT did not generally exhibit the mixed intergranular/pitting morphology found in field retrievals. In neutral salt spray (ASTM B117), for instance, smooth-sided hemispherical pitting was the corrosion mode observed.Test techniques were developed for ranking SWAAT corrosion performance of brazed sheet samples and heat exchangers based on time to perforation - the criterion of particular interest in this application - rather than subjective visual appearance ratings or unreliable pit depth measurements. These techniques were applied in the development of a new perforation-resistant tube alloy, “K319”.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Accelerated Corrosion Test Methods for Evaluating External Corrosion Resistance of Vacuum Brazed Aluminum Heat Exchangers


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Scott, A.C. (Autor:in) / Harris, J.F. (Autor:in) / Woods, R.A. (Autor:in)

    Kongress:

    International Congress & Exposition ; 1991



    Erscheinungsdatum :

    01.02.1991




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





    A Corrosion Resistant Alloy for Vacuum Brazed Aluminum Heat Exchangers

    Scott, A.C. / Harris, J.F. / Woods, R.A. | SAE Technical Papers | 1991


    A corrosion resistant alloy for vacuum brazed aluminum heat exchanger

    Woods,R.A. / Scott,A.C. / Harris,J.F. | Kraftfahrwesen | 1991


    Prefluxed Aluminum Tube for Brazed Automotive Heat Exchangers

    Morley, E. J. / Boerjeson, R. / Syslak, M. et al. | British Library Conference Proceedings | 1995


    Prefluxed Aluminum Tube for Brazed Automotive Heat Exchangers

    Morley, E. J. / Syslak, M. / Börjeson, R. | SAE Technical Papers | 1995