Microindentation method for in situ stress measurements in precipitated iron sulfate films

N. I. Tymiak; J. C. Nelson; D. F. Bahr; William W Gerberich

doi:10.1016/S0010-938X(98)00117-6

Microindentation method for in situ stress measurements in precipitated iron sulfate films

N. I. Tymiak, J. C. Nelson, D. F. Bahr, William W Gerberich

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Active-passive potential steps have been applied during continuous microindentation into 300 μm thick Fe3%Si sheets exposed to 1 M H₂SO₄. First, samples were allowed to deflect in the indentation direction whereby the indenter penetration changed due to local metal dissolution and sample deflection resulting from passive film stress induced bending. Samples were then constrained to eliminate stress induced deflection. A distinct difference between the indentation curves for the above two types of tests allowed separation of the effects of film stress and local dissolution. Indenter tip displacement correlated with the current behavior and was consistent with the salt film evolution and resulting electrostrictive film stress. A theoretical model allows estimates of the time dependent film thickness (3.5 μm at maximum) and electrostrictive film stress (330 MPa at maximum).

Original language	English (US)
Pages (from-to)	1953-1975
Number of pages	23
Journal	Corrosion Science
Volume	40
Issue number	11
DOIs	https://doi.org/10.1016/S0010-938X(98)00117-6
State	Published - Nov 1 1998

Bibliographical note

Funding Information:
The authors wish to acknowledge the Office of Naval Research for support under MURI Grant Number N-N00014-95-10539. In addition, N.I.T. wishes to thank Prof. J.V.R. Heberlein and Prof. S.L. Girshick of the University of Minnesota for support under DOE⧹DE-FG02-85ER13433A011. Experimental assistance from Hysitron Inc., Minneapolis MN is gratefully acknowledged.

Copyright:
Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.

Keywords

Iron
Passive films
Potentiostatic

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title = "Microindentation method for in situ stress measurements in precipitated iron sulfate films",

abstract = "Active-passive potential steps have been applied during continuous microindentation into 300 μm thick Fe3%Si sheets exposed to 1 M H2SO4. First, samples were allowed to deflect in the indentation direction whereby the indenter penetration changed due to local metal dissolution and sample deflection resulting from passive film stress induced bending. Samples were then constrained to eliminate stress induced deflection. A distinct difference between the indentation curves for the above two types of tests allowed separation of the effects of film stress and local dissolution. Indenter tip displacement correlated with the current behavior and was consistent with the salt film evolution and resulting electrostrictive film stress. A theoretical model allows estimates of the time dependent film thickness (3.5 μm at maximum) and electrostrictive film stress (330 MPa at maximum).",

keywords = "Iron, Passive films, Potentiostatic",

author = "Tymiak, {N. I.} and Nelson, {J. C.} and Bahr, {D. F.} and Gerberich, {William W}",

note = "Funding Information: The authors wish to acknowledge the Office of Naval Research for support under MURI Grant Number N-N00014-95-10539. In addition, N.I.T. wishes to thank Prof. J.V.R. Heberlein and Prof. S.L. Girshick of the University of Minnesota for support under DOE⧹DE-FG02-85ER13433A011. Experimental assistance from Hysitron Inc., Minneapolis MN is gratefully acknowledged. Copyright: Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.",

year = "1998",

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doi = "10.1016/S0010-938X(98)00117-6",

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AU - Tymiak, N. I.

AU - Nelson, J. C.

AU - Bahr, D. F.

AU - Gerberich, William W

N1 - Funding Information: The authors wish to acknowledge the Office of Naval Research for support under MURI Grant Number N-N00014-95-10539. In addition, N.I.T. wishes to thank Prof. J.V.R. Heberlein and Prof. S.L. Girshick of the University of Minnesota for support under DOE⧹DE-FG02-85ER13433A011. Experimental assistance from Hysitron Inc., Minneapolis MN is gratefully acknowledged. Copyright: Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.

PY - 1998/11/1

Y1 - 1998/11/1

N2 - Active-passive potential steps have been applied during continuous microindentation into 300 μm thick Fe3%Si sheets exposed to 1 M H2SO4. First, samples were allowed to deflect in the indentation direction whereby the indenter penetration changed due to local metal dissolution and sample deflection resulting from passive film stress induced bending. Samples were then constrained to eliminate stress induced deflection. A distinct difference between the indentation curves for the above two types of tests allowed separation of the effects of film stress and local dissolution. Indenter tip displacement correlated with the current behavior and was consistent with the salt film evolution and resulting electrostrictive film stress. A theoretical model allows estimates of the time dependent film thickness (3.5 μm at maximum) and electrostrictive film stress (330 MPa at maximum).

AB - Active-passive potential steps have been applied during continuous microindentation into 300 μm thick Fe3%Si sheets exposed to 1 M H2SO4. First, samples were allowed to deflect in the indentation direction whereby the indenter penetration changed due to local metal dissolution and sample deflection resulting from passive film stress induced bending. Samples were then constrained to eliminate stress induced deflection. A distinct difference between the indentation curves for the above two types of tests allowed separation of the effects of film stress and local dissolution. Indenter tip displacement correlated with the current behavior and was consistent with the salt film evolution and resulting electrostrictive film stress. A theoretical model allows estimates of the time dependent film thickness (3.5 μm at maximum) and electrostrictive film stress (330 MPa at maximum).

KW - Iron

KW - Passive films

KW - Potentiostatic

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JF - Corrosion Science

SN - 0010-938X

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ER -

Microindentation method for in situ stress measurements in precipitated iron sulfate films

Abstract

Bibliographical note

Keywords

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