Paper Title:
New Passivating Method to Galvanized Zn Coatings on Steel Substrate
  Abstract

As the increasing environmental awareness, to explore no-chromium passivation technique on galvanized Zn coatings becomes one of the most urgent affair. In this paper, one kind of silicate passivation technics was invented and by which method silicate conversion film on galvanized Zn coatings with satisfactory property was got. It is found that solution composition and operating conditions of passivation affect the property of conversion film markedly, and the optimal technics is: Na2SiO3 20 g/L, H2SO4 5 mL/L, HNO3 5 mL/L, H2O2 10 ml/L, pH 2.0, passivation time 20 s, temperature 25°C. The corrosion resistance of galvanized Zn coatings with different passivated method, including no passivated, Cr(VI) passivated, Cr(III) passivated and silicate passivated, were investigated by NSS test (5% Neutral Salt Spray). The silicate conversion film can keep no rust for 72 h and obviously shows the best property. All the results show that silicate passivation can provide galvanized Zn coatings superior anti-corrosion performance, so this new technics can replace the conventional chromate passivation technology to avoid the pollution of chromium and has a wider application in future.

  Info
Periodical
Advanced Materials Research (Volumes 163-167)
Edited by
Lijuan Li
Pages
4555-4558
DOI
10.4028/www.scientific.net/AMR.163-167.4555
Citation
Y. Y. Fan, Y. H. Jiang, R. Zhou, "New Passivating Method to Galvanized Zn Coatings on Steel Substrate", Advanced Materials Research, Vols. 163-167, pp. 4555-4558, 2011
Online since
December 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Shixue Wen, Jerzy A. Szpunar
Abstract:The influence of current density and temperature on the macrotexture, the orientation and size of grains, and the corrosion resistance of tin...
1413
Authors: Chun Yu Wang, Gao Hui Wu, Peng Chao Kang, Yun He Zhang, Zi Yang Xiu, Guo Qin Chen
Abstract:Improved corrosion resistance of carbon fiber reinforced aluminum (Cf/Al) matrix composites can be achieved by applying appropriate...
1675
Authors: Tian Yu Ma, Hua Gen Ying, Mi Yan
Abstract:Electroless Ni-Co-P coatings have been deposited on sintered Nd-Fe-B permanent magnets by optimizing the bath composition and operating...
53
Authors: Bing Ying Wang, Zhen Tong Sun
Abstract:Four different metal coatings of pure aluminum, aluminum zinc alloy, titanium, aluminum Titanium were prepared on the surface of X80 pipeline...
533
Authors: Huan Ming Chen, Ya Hong Gao, Qiong Lv, Dong Yang, Xin Xin Lin
Chapter 7: Composite Materials
Abstract:The Ni-P-W/nano-Al2O3 composite coatings were deposited on the surface of sintered NdFeB permanent magnet by...
901