Laboratory Techniques and Tube Alloy Ranking to Improve Internal Corrosion Resistance of Automotive Radiators 980056
Internal corrosion resistance of radiators and heaters is becoming more important as automotive manufacturers seek durability past 10 years, and as the usage of aluminum heat exchangers spreads to markets with poorly maintained engine coolant fluid from a corrosion inhibition standpoint. Simulated Service Corrosion Tests (SSCT) are used to evaluate the resistance of three aluminum alloys to tube failure in various corrosive water and depleted coolant conditions. The paper documents results from such tests that lead to two major conclusions: (1.) A weakly inhibited Oyama water solution with a silicated North American engine coolant is highly effective in ranking internal liner alloys for their pitting corrosion resistance, and (2.) AA7072 lined tubes exhibit superior pitting corrosion resistance compared to 1XXX lined tubes. Electrochemical test data obtained in a simulated pit electrolyte and the bulk test solution are utilized to develop an understanding of the SSCT results.
Citation: Krishnakumar, R., Kroetsch, K., and Ahrens, R., "Laboratory Techniques and Tube Alloy Ranking to Improve Internal Corrosion Resistance of Automotive Radiators," SAE Technical Paper 980056, 1998, https://doi.org/10.4271/980056. Download Citation
Author(s):
R. Krishnakumar, K. Kroetsch, R. Ahrens
Affiliated:
Delphi Harrison Thermal Systems
Pages: 9
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1998 Transactions - Journal of Passenger Cars-V107-6
Related Topics:
Corrosion
Aluminum alloys
Heat exchangers
Coolants
Drag
Radiators
Electrolytes
Aluminum
Alloys
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