Inorganic acid technology (IAT) is the chemical basis for the traditional green antifreeze. Generally, coolant corrosion inhibitors can be categorized into three distinct types:ġ. Conventional inorganic corrosion inhibitor compounds (traditional coolants).Ģ. Extended-life organic-acid inhibitor compounds (OAT coolants).ģ. Combinations of OAT and traditional inhibitors (hybrid or HOAT coolants). Each of these metal surfaces, and coolant design systems, present different corrosion inhibition problems that are addressed by different inhibitor compounds.
Many modern engines use a variety of metals – from lightweight aluminum and aluminum alloys through to heavy-duty mild steel and heavier alloys. Many of these are selected specifically for the purpose of inhibition of certain types of metal surfaces found in engine systems. There are very many different types of corrosion inhibitor compounds in the market that are used in the formulation of engine coolants. Coolants must also contain additives that inhibit corrosion and scale formation in the engine and radiator. As an example, there are at least three different shades of green coolant from three different manufacturers, none are the same formula,” explains Prestone technical training director Jay Buckley.Įngine coolants perform several functions in addition to providing freeze and boil protection. It doesn’t even signify what manufacturer the coolant was OE on. “Coolants in automotive light-duty applications are dyed many different colours the colour of any automaker’s particular coolant does not tell the technician what the formula is. The easy part is that most antifreeze manufacturers still make coolant with ethylene glycol (EG), while some use less-toxic propylene glycol (PG). Today, with different types of antifreeze technology in a rainbow of colours, confusion abounds among automotive people and consumers alike as to what colour antifreeze is best. Not all that long ago, no matter which brand of antifreeze you chose, it was green.
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