Marikkannu, C. and Sathiyanarayanan, S. and Rengaswamy, N.S.
(1999)
Studies on manganese phosphating of steel.
Bulletin of Electrochemistry , 15 (2).
pp. 104-108.
ISSN 0256-1654
Abstract
A new manganese phosphating bath which produces coating relatively at lower temperature within a reasonable time by the use of chemical accelerators bas been developed. Bath formulation and operating conditions have been optimized by coating weight determinations. Corrosion resistance property of the resultant coatings has been evaluated in 3% NaCI by electrochemical methods such as potentiodynamic polarisation, linear polarisation and impedance measurements. Results of the electrochemical techniques have heen complemented by salt spray, humidity and immersion tests. Porosity coatin~ has also been studied. Results show that the newer manganese phosphate bath gives good coatin~ at 353 K within 30 minutes. Addition of nitrates of various metals as accelerator produces thicker coatin~. Corrosion studies have shown that the corrosion resistance of the resultant coatin~ are much superior than the conventional coating;.
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