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Analysis of Aluminum Alloy Surface Formed by Rust-preventive Additive Component of Coolant

Article of Honda R&D Technical Review Vol.18 No.1


Coolant protects the engine water jacket against rusting, in other words, it acts as a rust preventive. The rust preventive performance depends upon the type and quantity of the additive.
Automotive coolants used in recent years can be broadly divided into three categories depending on the type of additive used: organic acid coolants, phosphate coolants, and silicate coolants.
In this research project, we studied coolant additives that provided aluminum with corrosion resistance, by combining organic acid coolant with organic additives that have a long heat-resistant life. The coolants were compared by analyzing the aluminum surface after the metal corrosion condition.


(1) Osawa, M., Morita, Y., Nagashima, T.: A Study of Extension of Engine Coolant Life Using Low Phosphate Organic Acid Inhibitors, SAE 2003-01-2023 (2003)
(2) Arguing over a few percentage points: The inhibitors Automotive cooling journal, May 1999, p. 22 (1999)
(3) JIS K2234, Engine antifreeze coolant
(4) Osawa, M., Fukuda, K., Ijima, T., Nagashima, T.: Development of Long Life Engine Coolant, HONDA R&D Technical Review, Vol. 12, No. 2, p. 159-164
(5) Masuko, N.: A theory of Rust, Japanese Standards Association, p. 27-30 (1997)
(6) Wagner, F. T., Moylan, T. E., Simko, S. J., Militello, M. C.: The Composition of Incipient Passivating Layers on Heat-Rejecting Aluminum in Carboxylate and Silicate Inhibited Coolants: Correlation with American Society for Testing and Materials D4340 Weight Losses, American Society for Testing and Materials D-15 Engine Coolant Committee Fourth Symposium on Engine Coolants, p. 11-12 (1997)
(7) Hercamp, R. D., Hudgens, R. D.: Silicate Gelation in Heavy-Duty Diesel Engine Cooling Systems, SAE 852327 (1985)
(8) Washington, D. A., McMullen, A. F., et al.: Performance of Organic Acid Based Coolants in Heavy Duty Applications, SAE 960644 (1996)

Author (organization or company)

Ayako OMORI(Tochigi R&D Center)、Mitsuru OSAWA(Tochigi R&D Center)

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