|Author||Rajendran, S. ♦ Apparao, B. V. ♦ Palaniswamy, N. ♦ Periasamy, V. ♦ Karthikeyan, G.|
|Source||CSIR-Central Electrochemical Research Institute|
|Subject Domain (in DDC)||Technology ♦ Engineering & allied operations|
|Subject Keyword||Corrosion Science and Engineering|
|Abstract||Introduction of a methylene group in the Carbon chain of carboxymethyl phosphonic acid (CMPA) results in 2-carboxyethyl phosphonic acid (2-CEPA). The inhibition efficiency(IE) of these two phosphonic acids, in the absence and presence of Zn2+, in controlling corrosion of carbon steel immersed in a neutral acqeous environment, containing 60 ppm Cl- has been evaluated by weight loss method. The IEs are measured as a function of immersed period and compared. The protective film has been analysed X-ray diffraction, Fourier transform infrared and luminescence spectra. A suitable mechanism of corrosion inhibition is proposed based on the results of weight loss study and various surface analysis techniques. The 2-CEPA-Zn2+ is found to offer better IE than the CEPA-Zn2+ system. This is due to the facts. (i) 2-CEPA keeps Zn+ in a more solubilised form , (ii) large size of Fe2+-2-CEPA complex, which is more relaxed, stainless and more stable than Fe2+ -CMPA complex. The protective film is found to consist of Fe2+-phosphonate complex and Zn(OH)2; it is found to be luminescent.|
|Education Level||UG and PG|
|Learning Resource Type||Article|
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