Preparations and Properties of Anti-corrosion Additives of Water-soluble Metal Working Fluids for Aluminum Alloy Materials

Abstract

This short review describes various types of anti-corrosion additives of water-soluble metal working fluids for aluminum alloy materials. It is concerned with synthetic additives classified according to their functional groups; silicone compounds, carboxylic acids and dibasic acids, esters, Diels-Alder adducts, various polymers, nitrogen compounds, phosphoric esters, phosphonic acids, and others. Testing methods for water-soluble metal working fluids for aluminum alloy materials are described for a practical application in a laboratory.

Natural Product-Derived Phosphonic Acids as Corrosion Inhibitors for Iron and Steel

“…The reaction is scalable, and has been performed up to 50 g scale. Ricinolic acid (19) gave an unexpected reaction product (24). The 31 P-NMR spectrum of 24 shows eight distinct peaks, clustered in two groups of four at 27-51 ppm.…”

“…Scheme 4. Synthesis of phosphonic acids from oleic acid (17) and ricinolic acid (19), and a proposed pathway for the formation of phosphonic acid (18) (only one of two regioisomers shown) and 24 (only one of eight regio-and stereoisomers shown). DEP: Diethylphosphite, DTBP: Di-tert-butyl peroxide.…”

“…Various phosphonic acids have therefore been used in large quantities as additives in MWFs. Among them are amphiphilic alkylphosphonic acids [ 19 , 20 ]. In addition, more polar amino- or hydroxy-phosphonic acids are often found in MWFs with antiscalant properties [ 21 ].…”