Paper Title:
Influencing Factors of Phytic Acid Conversion Coating on AZ91 Magnesium Alloy
  Abstract

AZ91 magnesium alloy is selected as the matrix metal. SEM, EDS, Tafel and EIS were adopted and spot test was carried out to investigate the influence of pH value, phytic acid concentration, temperature,conversion time on corrosion resistance of conversion coatings. Result shows that process of phytic acid forming is the controlled metal corrosion process and the uneven surface pattern reflects the different chemical properties of two-phase current on magnesium alloy surface, which is implied by the conversion surface. It is proved by the test that pH value is committed the most to the corrosion resistance of the conversion coating, and the next is the phytic acid concentration. It is found that the corrosion resistance of the conversion coating is the best when pH value of the conversion solution is 4.5; The conversion coating has little influence on the cathode reaction dynamics, however, more importantly, it changes the dynamics of the alloy electrode anode solution reaction, therefore, the alloy’s anode current density decreases while the corrosion resistance of magnesium alloy is enhanced.

  Info
Periodical
Advanced Materials Research (Volumes 239-242)
Edited by
Zhong Cao, Xueqiang Cao, Lixian Sun, Yinghe He
Pages
2336-2341
DOI
10.4028/www.scientific.net/AMR.239-242.2336
Citation
Y. L. Lu, Y. K. Chen, S. G. Du, Y. Guo, Q. Hong, "Influencing Factors of Phytic Acid Conversion Coating on AZ91 Magnesium Alloy", Advanced Materials Research, Vols. 239-242, pp. 2336-2341, 2011
Online since
May 2011
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$32.00
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