Data were gathered to predict the performance of aluminum in automobile coolant systems, particularly in radiators and heater cores. A number of candidate materials were evaluated in an accelerated laboratory glassware test, including vacuum brazed materials, flux brazed sheet, unbrazed Alclad 3004 and Bare 5052, "brazed" Alclad 3004, and zinc-containing filler metal. This testing indicated that conventional aluminum brazing materials may not be suitable under service conditions unless significant improvements are made in corrosion resistance and/or coolant inhibition. Residual aluminum/silicon alloy cladding layer on brazing sheet is susceptible to galvanic corrosion along aluminum matrix-silicon particle interfaces. Once cladding is penetrated, corrosion continues into the core alloy. This attack is accentuated by an unfavorable galvanic relationship between the core (anodic) and the cladding (cathodic). Although corrosion performance can be greatly improved by utilizing an inner anod cladding alloy (Alclad concept), fabricating and manufacturing processes would be simplified by using a conventional product in a properly inhibited cooling system.

  • Supplemental Notes:
    • Presented at the SAE Congress and Exposition, Detroit, 27 February-3 March 1978.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Dorward, R C
  • Publication Date: 1978

Media Info

  • Features: References;
  • Pagination: 10 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00395643
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 780302, HS-025 412U
  • Files: HSL, USDOT
  • Created Date: Jun 30 1985 12:00AM