NDLI: Some triphosphates as corrosion inhibitors for mild steel in 3% NaCl solution

Content Provider	CSIR - National Institute of Science Communication and Policy Research (NISCPR)
Author	Lata, Suman Chaudhary, R. S.
Abstract	Inhibition of mild steel corrosion in 3% sodium chloride solution by sodium tripolyphosphate (STPP), sodium hexametaphosphate (SHMP) and adenosine triphosphate (ATP) in presence of 200 ppm zinc acetate has been investigated using weight loss, electrochemical polarisation and scanning electron microscopy techniques. Various corrosion parameters such as Tafel slopes, corrosion current density, heat of adsorption and activation energy value have been calculated to understand the inhibition mechanism. Inhibition efficiency increased with increase in concentration for STPP and SHMP whereas it decreased for ATP. However, inhibition efficiency decreased for all the three phosphates with increase in temperature. All the three phosphates acted as mixed inhibitors though anodic reactions are suppressed more in comparison to the cathodic reactions. STPP acted through chemisorption whereas SHMP and ATP are physically adsorbed over the surface of mild steel.
Ending Page	374
Starting Page	364
ISSN	0971457X
Journal	Indian Journal of Chemical Technology (IJCT)
Issue Number	04
Volume Number	15
Language	English
Publisher	Council of Scientific & Industrial Research (CSIR)
Publisher Date	2008-07-01
Access Restriction	Open
Subject Keyword	Phosphates Sodium chloride Corrosion Inhibitor Mild Steel
Content Type	Text
Resource Type	Article
Subject	Chemical Engineering Chemistry

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Some triphosphates as corrosion inhibitors for mild steel in 3% NaCl solution