Effect of K2TiF6 and Na2B4O7 as electrolyte additives on pore morphology and corrosion properties of plasma electrolytic oxidation coatings on ZM21 magnesium alloy

D, Sreekanth and N, Rameshbabu and K, Venkateswarlu and Ch, Subrahmanyam and L, Rama Krishna and K, Prasad Rao (2013) Effect of K2TiF6 and Na2B4O7 as electrolyte additives on pore morphology and corrosion properties of plasma electrolytic oxidation coatings on ZM21 magnesium alloy. Surface and Coatings Technology, 222. pp. 31-37. ISSN 0257-8972

Full text not available from this repository. (Request a copy)

Abstract

Protection of magnesium alloys from faster degradation in physiological environment is of primary importance in order for them to be used as biodegradable implant materials. Present investigation reports the effect of sodium tetra borate (Na2B4O7·10H2O) and potassium titanium fluoride (K2TiF6) on corrosion behavior of oxide coatings developed on ZM21 magnesium alloy by plasma electrolytic oxidation (PEO) in Na2SiO3–KOH base electrolyte system. The effect of these additives on the microstructure and corrosion properties of coatings was investigated. The surface morphology and phase composition of these ceramic coatings were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Analysis of pores in the coating was done using a three-dimensional (3D) optical profilometer. The corrosion resistance was evaluated by potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS) in simulated body fluid (SBF) environment at a pH of 7.4. It was found that the use of additives significantly altered the pore morphology of the coating. Among the PEO treated samples, the coating formed in silicate based electrolyte system containing 2 g/L of Na2B4O7·10H2O showed less porosity and improved corrosion resistance in SBF environment.

[error in script]
IITH Creators:
IITH CreatorsORCiD
Ch, Subrahmanyamhttps://orcid.org/0000-0002-2643-3854
Item Type: Article
Uncontrolled Keywords: Plasma electrolytic oxidation; ZM21 magnesium alloy; Corrosion; Biodegradable implant
Subjects: Chemical Engineering > Cleaning, color, coating, related technologies
?? sub5.8 ??
Divisions: Department of Chemistry
Depositing User: Mr. Siva Shankar K
Date Deposited: 24 Sep 2014 06:12
Last Modified: 04 Dec 2017 06:32
URI: http://raiith.iith.ac.in/id/eprint/58
Publisher URL: http://dx.doi.org/10.1016/j.surfcoat.2013.01.056
OA policy: http://www.sherpa.ac.uk/romeo/issn/0257-8972/
Related URLs:

Actions (login required)

View Item View Item
Statistics for RAIITH ePrint 58 Statistics for this ePrint Item