On the microstructural and electrochemical nature of hydrothermally treated Al-Zr and Al-Ti surfaces

Juan Tan; Marco Crosio; Nadja Maria Vinkel; Peter Jensen; Shoshan Tamar Abrahami; Visweswara Chakravarthy Gudla; Rajan Ambat

doi:10.1016/j.corsci.2019.108244

On the microstructural and electrochemical nature of hydrothermally treated Al-Zr and Al-Ti surfaces

Juan Tan, Marco Crosio, Nadja Maria Vinkel, Peter Jensen, Shoshan Tamar Abrahami, Visweswara Chakravarthy Gudla^*, Rajan Ambat

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

Hydrothermal treatment of sputtered Al-Zr and Al-Ti coatings was performed in an autoclave. Electron microscopy of generated conversion layers revealed dual layered boehmite films. Needle morphology at top, and thin compact oxide at interface with metal substrate was observed. X-ray energy dispersive, and photoelectron spectroscopy revealed enrichment of Zr or Ti in compact oxide, and oxidation of Zr, Ti and Al. Potentiodynamic polarization showed decrease in passive current densities due to treatment. Treated Zr containing surfaces showed lower corrosion current density when compared to those containing Ti. The observed electrochemical properties are correlated with microstructure and composition of conversion layers.

Original language	English
Article number	108244
Journal	Corrosion Science
Volume	163
Number of pages	13
ISSN	0010-938X
DOIs	https://doi.org/10.1016/j.corsci.2019.108244
Publication status	Published - 2020

Keywords

A. Aluminium
A. Sputtered films
B. Polarization
B. TEM
C. Passive films
C. Interfaces

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title = "On the microstructural and electrochemical nature of hydrothermally treated Al-Zr and Al-Ti surfaces",

abstract = "Hydrothermal treatment of sputtered Al-Zr and Al-Ti coatings was performed in an autoclave. Electron microscopy of generated conversion layers revealed dual layered boehmite films. Needle morphology at top, and thin compact oxide at interface with metal substrate was observed. X-ray energy dispersive, and photoelectron spectroscopy revealed enrichment of Zr or Ti in compact oxide, and oxidation of Zr, Ti and Al. Potentiodynamic polarization showed decrease in passive current densities due to treatment. Treated Zr containing surfaces showed lower corrosion current density when compared to those containing Ti. The observed electrochemical properties are correlated with microstructure and composition of conversion layers.",

keywords = "A. Aluminium, A. Sputtered films, B. Polarization, B. TEM, C. Passive films, C. Interfaces",

author = "Juan Tan and Marco Crosio and Vinkel, {Nadja Maria} and Peter Jensen and Abrahami, {Shoshan Tamar} and Gudla, {Visweswara Chakravarthy} and Rajan Ambat",

year = "2020",

doi = "10.1016/j.corsci.2019.108244",

language = "English",

volume = "163",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Pergamon Press",

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TY - JOUR

T1 - On the microstructural and electrochemical nature of hydrothermally treated Al-Zr and Al-Ti surfaces

AU - Tan, Juan

AU - Crosio, Marco

AU - Vinkel, Nadja Maria

AU - Jensen, Peter

AU - Abrahami, Shoshan Tamar

AU - Gudla, Visweswara Chakravarthy

AU - Ambat, Rajan

PY - 2020

Y1 - 2020

N2 - Hydrothermal treatment of sputtered Al-Zr and Al-Ti coatings was performed in an autoclave. Electron microscopy of generated conversion layers revealed dual layered boehmite films. Needle morphology at top, and thin compact oxide at interface with metal substrate was observed. X-ray energy dispersive, and photoelectron spectroscopy revealed enrichment of Zr or Ti in compact oxide, and oxidation of Zr, Ti and Al. Potentiodynamic polarization showed decrease in passive current densities due to treatment. Treated Zr containing surfaces showed lower corrosion current density when compared to those containing Ti. The observed electrochemical properties are correlated with microstructure and composition of conversion layers.

AB - Hydrothermal treatment of sputtered Al-Zr and Al-Ti coatings was performed in an autoclave. Electron microscopy of generated conversion layers revealed dual layered boehmite films. Needle morphology at top, and thin compact oxide at interface with metal substrate was observed. X-ray energy dispersive, and photoelectron spectroscopy revealed enrichment of Zr or Ti in compact oxide, and oxidation of Zr, Ti and Al. Potentiodynamic polarization showed decrease in passive current densities due to treatment. Treated Zr containing surfaces showed lower corrosion current density when compared to those containing Ti. The observed electrochemical properties are correlated with microstructure and composition of conversion layers.

KW - A. Aluminium

KW - A. Sputtered films

KW - B. Polarization

KW - B. TEM

KW - C. Passive films

KW - C. Interfaces

U2 - 10.1016/j.corsci.2019.108244

DO - 10.1016/j.corsci.2019.108244

M3 - Journal article

SN - 0010-938X

VL - 163

JO - Corrosion Science

JF - Corrosion Science

M1 - 108244

ER -

On the microstructural and electrochemical nature of hydrothermally treated Al-Zr and Al-Ti surfaces

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