Abstract

The corrosion of engine blocks by engine coolant is a critical issue for the automotive industry. In this chapter, after a summary of some fundamental aspects of the corrosion of pure magnesium in ethylene glycol solutions, a review of the corrosion performance of magnesium alloys in ethylene glycol solutions is presented. Based on the knowledge gained, the corrosion behaviour of AZ91D and some recently developed magnesium engine block alloys in several selected commercial coolants is assessed by means of immersion testing, hydrogen evolution measurement, galvanic current monitoring and the well-accepted ASTM D1384 standard test. Finally, a corrosion inhibition strategy is presented and inhibitors suitable for magnesium alloys in coolants are identified.

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