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An Integrated Study of Tribocorrosion in a Duplex Stainless Steel
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Tribocorrosion is one of the most dangerous threats to material systems due to the accelerated and uncontrollable damage. The interaction of mechanical rubbing and chemical corrosion causes material failure in a quite short time. Tribocorrosion widely exists in different industries, such as mining, oil and gas production, biomedical implants and chemical-mechanical planarization. This thesis studies the tribocorrosion in mild rubbing conditions. A new experimental approach was developed to study the effects of applied loads on passivation and surface defects. Results showed that properties of the passivation layer in duplex stainless steels were affected under different loads and surface defects elongated in the rubbing direction. This new experimental approach was proven to be an effective method to evaluate tribocorrosion in duplex stainless steels in mild wear conditions. Primary experimental approaches were utilized in this study. A new methodology was developed by configuring an integrated triboelectrochemical tester. A flat-on-flat configuration was developed that contained a pair of flat rubbing parts, a tribometer and an electrochemical workstation. A duplex stainless steel 2205 was used due to the wide applications in corrosive environments. The tribocorrosion experiments were conducted in a 3.5wt% NaCl solution. The applied loads ranged from 1N to 3N at a fixed surface speed of 1.5cm/s. Analysis was carried out in evaluating the effects of mechanical rubbing on corrosion and passivation. Results showed that mechanical rubbing promoted corrosion. Meanwhile, a passivation layer was generated due to the interaction of mechanical rubbing and corrosion. When the load was increased, the passivation current density increased first then decreased. The shapes and the sizes of surface defects were affected by different loads. The surface defects elongated in the rubbing direction. Detailed mechanisms were also discussed in this thesis. This thesis includes six sections. After a brief introduction of tribocorrosion, the motivation and objectives of this study are discussed. A new integrated triboelectrochemical approach for studying tribocorrosion is discussed in section 3 along with materials and characterization. Section 4 discusses about the synergy of wear and passivation while the section 5 studies pitting during tribocorrosion. The dissertation ends with conclusion and recommended future work.
Huang, Zhihao (2015). An Integrated Study of Tribocorrosion in a Duplex Stainless Steel. Master's thesis, Texas A & M University. Available electronically from