Interrelating electrochemical properties, salt-spray resistance and industrial performance of white-rust controlling passivators for galvanised surfaces

Singh, D D N and Gaur, B and Dey, A K and Singh, B K and Dey, M and Ghosh, Rita (1999) Interrelating electrochemical properties, salt-spray resistance and industrial performance of white-rust controlling passivators for galvanised surfaces. NML Technical Journal, 40 (2). pp. 63-76.

[img]PDF
Restricted to Repository staff only

3601Kb

Abstract

The relationship between electrochemical polarisation behaviour and corrosion resistance (imparted by passivators based on hexavalent chromium) of galvanised surfaces, is studied. A correlation exists between the actual field performance of passivators and the accelerated corrosion-tests carried out in the Laboratory. Effect of nitrate, fluoride, molybdate, sulphate, ions of aluminium and zinc, etc. has also been investigated. It has been noted that a pH between 3.5 to 4.5 provides the maximum salt spray resistance to the passivated surface. The morphology of protective films formed in the presence of additives, has been studied with the help of scanning electron microscopy. The mechanism of passivation has been described.

Item Type:Article
Official URL/DOI:http://library/articleDetails.jsp?recordid=941
Uncontrolled Keywords:Passivator; Galvanised steel; Potentiodynamic polarisation; Salt spray resistance; Microstructure; Industrial performance
Divisions:Corrosion and Surface Engineering
ID Code:1763
Deposited By:Mr. G Shailendra Kumar
Deposited On:28 Sep 2010 16:35
Last Modified:09 Nov 2012 14:58
Related URLs:

Repository Staff Only: item control page