Magnesium Mg alloys in commercial coolants

Although the corrosion of pure magnesium in commercial coolants has been reported [9,31], in practice, an engine block cannot be made of pure magnesium, and the coolant cannot be pure ethylene glycol solution only. Therefore, it is important to understand the corrosion behaviour of magnesium alloys in commercial coolants. 

AM-SCl is a promising magnesium engine block material which has been selected as an engine block material for evaluation in the USCAR programme 

None of these commercial coolants has acceptable corrosivity to AM-SCl when the general and galvanic corrosion rates at room and high temperatures are considered. This indicates that an engine block made of AM-SCl alloy will suffer from either general or galvanic or combined corrosion attack no matter whether the vehicle is running or not when these selected commercial coolants are used. 

The ASTM D1384 test also confirmed that the weight loss rate of AM-SCl in MBL is higher than 0.67mg/cm /week, indicating that AM-SCl will not be able to survive in the MBL coolant. 

In aqueous solutions, organic compounds normally have some inhibition effect on metals. For example, it has been found [33] that simple sodium linear-saturated carboxylates can effectively inhibit the corrosion of a magnesium 

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