Effect of Solution pH on Layered Double Hydroxide Formation on Electrogalvanized Steel Sheets

Katsuya Hoshino, Shinichi Furuya, Rudolph G. Buchheit

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The effect of solution pH on layered double hydroxide (LDH) formation on electrogalvanized steel sheets (EG steel) was investigated in this study. EG steel with a Zn coating weight of 64 g/m 2 was used as a substrate and was immersed in a 0.25 M Na 2 Al 2 O 4 -based solution having several pH values to form a Zn-Al-based LDH conversion coating. After rinsing and drying, corrosion resistance was evaluated by EIS. It was found that corrosion resistance increased with increasing pH up to pH 12.6. However, above this pH, corrosion resistance tended to display a sharp decrease. To understand this trend, the conversion coating was characterized by FT-IR, XRD and GDOES. The conversion coating was found to consist mainly of Zn 2 Al(OH) 6 (CO 3 ) 0.5 ·xH 2 O crystals (an LDH). The thickness of the conversion coating layer increased with increasing pH up to pH 12.4, but above this pH, its thickness tended to decrease due to the formation of ZnO. The reason for the dependence of corrosion resistance on solution pH is discussed from the viewpoints of the thickness and changes in the microstructure of the conversion coating layer, including its crystal size, density and uniformity, which could vary during the initial formation of ZnO at pH values above 12.6.

Original languageEnglish
Pages (from-to)2237-2244
Number of pages8
JournalJournal of Materials Engineering and Performance
Volume28
Issue number4
DOIs
StatePublished - Apr 1 2019

Bibliographical note

Publisher Copyright:
© 2019, ASM International.

Keywords

  • conversion coating
  • corrosion resistance
  • galvanized steel
  • layered double hydroxide

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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