Corrosion inhibition of a carbon steel in 2M H3PO4 medium by "triazine" compounds

The effect of addition of some triazine compounds on the corrosion behaviou r of steel in 2M H3PO4 has been studied by weight loss and electrochemical polarisation methods, Both methods showed that the dissolution rate was dep endent on the chemical properties and concentration of the product. From co mparison of results, it was found that 6-azathymine (T6) is the best inhibi tor and its inhibition efficiency reaches a maximum value of 86% at 10(-3)M . Polarisation measurements indicated that T6 acts as cathodic inhibitor by merely blocking the reaction sites without changing the mechanism of the h ydrogen evolution reaction, It was found that T6 was adsorbed on steel surf ace according to a Langmuir isotherm model. The effect of temperature indic ated that inhibition efficiency of T6 is dependent on the temperature in th e range 25 - 50 degrees C.