Microstructure, corrosion resistance and adhesive strength of calcium phosphate coatings formed on pure magnesium by a simple immersion method

M. Tomozawa, S. Hiromoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

Octa-calcium-phosphate (OCP) coatings were formed at weak acid on pure magnesium by a hydrothermal treatment. The microstructure of the coatings was investigated with XRD, SEM and TEM. At initial stage of treatment, a dual-layer coating consisting of an inner dense layer and an outer layer composed of plate-like crystals was formed. Both the layers grew with an increase in the treatment time up to 7.2 ks. Further increase in the treatment time caused the following change in the coating; (1) suppression of the coating growth, (2) partial change of OCP in the inner layer into hydroxyapatite (HAp) and (3) growth of a Mg(OH) 2 layer at the interface between the coating and the Mg substrate. The adhesive strength of the coatings decreased with the growth of the Mg(OII) layer. The corrosion resistance of the specimens in a 3.5wt% NaCl solution increased with the growth of the coating.

Original languageEnglish
Title of host publicationCorrosion Posters (General) - 218th ECS Meeting
Pages31-37
Number of pages7
Edition30
DOIs
Publication statusPublished - 2011
Externally publishedYes
EventCorrosion General Poster Session - 218th ECS Meeting - Las Vegas, NV, United States
Duration: 2010 Oct 102010 Oct 15

Publication series

NameECS Transactions
Number30
Volume33
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

ConferenceCorrosion General Poster Session - 218th ECS Meeting
CountryUnited States
CityLas Vegas, NV
Period10/10/1010/10/15

ASJC Scopus subject areas

  • Engineering(all)

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