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Research Papers: Friction and Wear

A New Asperity-Scale Mechanistic Model of Tribocorrosive Wear: Synergistic Effects of Mechanical Wear and Corrosion

[+] Author and Article Information
Ali Ghanbarzadeh

School of Mechanical Engineering,
Institute of Functional Surfaces,
University of Leeds,
Leeds LS29JT, UK
e-mail: a.ghanbarzadeh@leeds.ac.uk

Farnaz Motamen Salehi, Michael Bryant, Anne Neville

School of Mechanical Engineering,
Institute of Functional Surfaces,
University of Leeds,
Leeds LS29JT, UK

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 25, 2018; final manuscript received August 16, 2018; published online October 11, 2018. Assoc. Editor: Noel Brunetiere.

J. Tribol 141(2), 021601 (Oct 11, 2018) (12 pages) Paper No: TRIB-18-1037; doi: 10.1115/1.4041246 History: Received January 25, 2018; Revised August 16, 2018

A corrosive wear model is considered at the asperity-scale of a tribocorrosive wear system as well as the traditional Archard-type mechanical wear model. The geometry of the surface asperities is modified in a contact mechanics model with respect to both corrosive and mechanical wear calculations. This model was presented and validated for prediction of the electrochemistry in the first part of this work. The material used in the experimental part of this work was CoCrMo plate working electrode (WE) and Si3N4 ball as the counter body in a reciprocating configuration. Experiments were conducted at loads of 5, 7.5, and 10 N and the contributions of total mechanical wear and corrosion were measured. The model is then tuned to predict the chemical and mechanical components of the total wear of the system. The synergistic effect of corrosion on mechanical wear and mechanical wear on corrosion are modeled numerically in this work. The values are then used to explain different components of mechanistic tribocorrosive wear models present in the literature. This deterministic model, for the first time, calculates the corrosion-enhanced wear in a tribocorrosive wear environment and proposes that changes in the topography are responsible for this synergistic effect. The results show a linear dependence of the corrosion enhanced wear, wear-enhanced corrosion, and the pure mechanical wear on the applied load. Results also suggest that the wear enhanced corrosion has a significant contribution in the overall degradation of the material.

Copyright © 2019 by ASME
Topics: Wear , Corrosion , Stress
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Figures

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Fig. 1

Schematic of tribometer and the three-electrode cell used for electrochemical measurement

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Fig. 2

Evolution of the current density as a function of time for three applied loads of 5, 7.5, and 10 N

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Fig. 3

Two-dimensional microscopic images of the plate wear scars after reciprocating tribometer testing under various loads of (a) 5 N, (b) 7.5 N, and (c) 10 N

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Fig. 4

Wear scar depth for CoCrMo samples during reciprocating tribometer resting with varying load

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Fig. 5

Movement of the surfaces and exposure of the nascent surface asperities to the corrosive environment

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Fig. 6

Flowchart of the whole numerical approach for calculation of the electrochemistry in tribocorrosion conditions

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Fig. 7

Sensitivity of the corrosion model to the calibration parameter (igrowth0)

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Fig. 8

Sensitivity of the model to the non-dimensional coefficient of mechanical wear

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Fig. 9

Average mechanical wear depth evolution for applied loads of 5, 7.5, and 10 N from simulations in tribocorrosion condition

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Fig. 10

Average corrosive wear depth evolution for applied loads of 5, 7.5, and 10 N from simulation in tribocorrosion condition

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Fig. 11

Comparison between total mechanical and total corrosive wear for applied load of 10 N in tribocorrosion condition

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Fig. 12

Total average wear depth and the contributions of mechanical and corrosive wear components

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Fig. 13

Difference in the total mechanical wear in the presence of the corrosion and the pure mechanical wear in the absence of the corrosion (simulation)

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Fig. 14

Components of pure mechanical wear and the corrosion enhanced mechanical wear of the total mechanical wear (simulation)

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Fig. 15

Different components of the total tribocorrosive wear for applied loads of 5, 7.5, and 10 N (simulation)

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Fig. 16

The total mechanical and corrosive wear depth at different applied loads; simulations

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Fig. 17

Variations of the corrosive wear with the mechanical wear (simulations)

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Fig. 18

Comparison of the model proposed by Cao et al. [37] and the linear fit; total mechanical wear

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Fig. 19

Comparison of the model proposed by Cao et al. [37] and the linear fit; total electrochemical wear

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Fig. 20

Variation of the pure mechanical wear and the corrosion enhanced wear with the applied load; simulation results

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