Preparation of corrosion resistant film on magnesium alloys with different aluminum contents by steam coating

Mika Tsunakawa, Yuta Shimada, Kae Nakamura, Takahiro Ishizaki

Research output: Contribution to conferencePaper

Abstract

Magnesium alloys are highly desirable in the fields of electronic and transport industry. However,they have a significant disadvantage in corrosion resistance. Thus, the preparation of protective film on the Mg and its alloys is required to improve the corrosion resistance. Unfortunately, typical surface treatment on Mg Alloys such as chromate treatment are highly toxic.We proposed a novel and environmentally friendly coating method for Mg alloys, that is, steam coating. Steam coating is a chemical free method and only pure water is used as a steam source. In this study, we aimed to fabricate corrosion resistant films on Mg alloys with different aluminum contents (AZ31, AZ61, AZ91D) by steam coating. XRD patterns of all films demostrated that all films were composed of Mg(OH)2, AlOOH, and Mg-Al layered double hydroxide (LDH). SEM observation revealed that all substrates were completely covered with the film. Potentiodynamic polarization curve measurements showed that the corrosion resistance of the film coated Mg alloys was considerably improved compared to untreated Mg alloy despite types of Mg alloys.

Original languageEnglish
Publication statusPublished - 2017 Jan 1
EventJoint European Corrosion Congress 2017, EUROCORR 2017 and 20th International Corrosion Congress and Process Safety Congress 2017 - Prague, Czech Republic
Duration: 2017 Sep 32017 Sep 7

Other

OtherJoint European Corrosion Congress 2017, EUROCORR 2017 and 20th International Corrosion Congress and Process Safety Congress 2017
CountryCzech Republic
CityPrague
Period17/9/317/9/7

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Keywords

  • Coating
  • Composite hydroxide
  • Corrosion resistance
  • Magnesium alloy

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Surfaces and Interfaces

Cite this

Tsunakawa, M., Shimada, Y., Nakamura, K., & Ishizaki, T. (2017). Preparation of corrosion resistant film on magnesium alloys with different aluminum contents by steam coating. Paper presented at Joint European Corrosion Congress 2017, EUROCORR 2017 and 20th International Corrosion Congress and Process Safety Congress 2017, Prague, Czech Republic.