Paper Title:
Chromate-Free Passive Films Made by Manganate and Waterborne Polyurethane on Galvanized Steel Sheets
  Abstract

In order to develop an environmental friendly passive films on galvanized steel sheet, a chromium-free passive solution based on waterborne polyurethane (WPU) and Manganate was studied. The results show that the optimized compositions in passive solution are KMnO4 6g/L, (NH2)2CS 5g/L and WPU 150g/L. The passive films were prepared by dipping steel substrates into the passive solution for 10 seconds and drying at 120 °C for 30 seconds. SEM observation shows that the film’s thickness is about 1.5 µm. XRD patterns indicates that the chromate-free passive films mainly consisted of MnO2 and K2MnO4. Anticorrosion tests indicate that the chromate-free passive films can provide an excellent barrier to corrosive agents.

  Info
Periodical
Advanced Materials Research (Volumes 154-155)
Edited by
Zhengyi Jiang, Xianghua Liu and Jinglong Bu
Pages
292-298
DOI
10.4028/www.scientific.net/AMR.154-155.292
Citation
X. H. Kong, H. Yang, Y. X. Liu, W. H. Lu, J. Guo, S. S. Liu, "Chromate-Free Passive Films Made by Manganate and Waterborne Polyurethane on Galvanized Steel Sheets", Advanced Materials Research, Vols. 154-155, pp. 292-298, 2011
Online since
October 2010
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Price
$32.00
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