Study Amines as an Additive for Metalworking Fluids
Ten amines (alkanol amines, cyclic amines, amino alcohols, ethoxylated fatty amines) and a cataionic compound (didecyl dimethyl ammonium compound, DDAC) were studied as metal corrosion inhibitors; such as cast iron, copper, 6061 and 7075 aluminum and AZ91D magnesium. The study of their
bioresistance and lubricity characteristics were included. The modified
McDonnell Douglas method for bioactivity & Falex Pin & Block tester for
lubricity were used. Cataionic Compound (DDAC) has excellent corrosion
protection for aluminum, copper and magnesium, but cast iron corrosion
inhibition was the worst among the 10 additives. Ethoxylated Tallow Fatty Amine
has the highest lubricity but bioresistance was the worst. The other amines have
good cast iron corrosion protection, but aluminum and magnesium corrosion were
not acceptable. Based on the performance of corrosion, lubricity and
bioresistance, DDAC was chosen as the candidate for further study in formulation
in synthetic coolant application.