In-House Publication No. 201202-01 Volatile Corrosion Inhibitor (VAPPRO 872) Nelson Cheng 1 PhD (Honoris Causa), Patrick Moe 1 BSc, Grad Dip, MSc 1 Magna International Pte Ltd Singapore Dr Benjamin Valdez Salas 2 , Dr Michael Schorr 2 2 Autonomous University of Baja California Article Info Abstract Article History Date of Publication: 20 th February 2012 The main objective of this collaborative project was to obtain an optimum formulation from the base formulation of VAPPRO 872, a commercial volatile corrosion inhibitor (VCI) product from Magna International Pte Ltd. Percentages of the corrosion inhibitor (CI) and calcium sulphonate (CS), type of kerosene and type of calcium sulphonate were varied, and the various formulated products were tested for its flammability and viscosity. The different formulations were each coated onto a metal test piece to further test for its corrosion rate using the Electrochemical Impedance Spectroscopy. The results showed that the optimum formulation with the best efficiency was 0.5% CI, 3% “old” CS, 19% mineral oil and 77.5% pure kerosene, with an efficiency of 89.14%. This was chosen because of its relatively high efficiency and reduced costs. Keywords: Volatile Corrosion inhibitor, Flammability, Viscosity 1. Introduction Corrosion occurs when a material, usually metal, starts to weaken and its properties become less desirable. This is due to irreversible chemical reactions with the surroundings. Corrosion is a very common problem in many industries, where metals are used in their daily operations and when these machines fail, it costs a large sum of money to replace them.