Abstract
Due to its accelerated, uncontrollable, and unpredictable nature, pitting is one of the most common failure modes in pipelines used for oil and gas exploration. A comprehensive understanding of the mechanisms of pitting under conditions involving both abrasion and corrosion is currently lacking. This research investigated the effects of mechanical rubbing on the development of pitting of a widely used Type 2205 duplex stainless steel. Tribocorrosion experiments were conducted under mildly abrasive conditions where there is pitting but no significant material loss. Results showed that passivation was accelerated by rubbing, even though pitting was simultaneously formed. The length-to-width aspect ratio of the pits increased exponentially when the normal load during corrosive wear tests was increased. This phenomenon could lead to catastrophic failure in industrial applications such as underground and deep ocean pipes in the oil and gas industry.
Highlights
A report conducted in 1987 showed the oil and gas industry accounted for at least half of the total costs of corrosion in the United States [1]
Experimental rub the contact surface. This eliminated visible abrasion so that the focus could be on surTo study the initiation of tribochemical wear, a flat-on-flat configuration was used to facethe oxidation rather than
Several images were taken of each analysis by interferometer and multiple scans were performed for each load
Summary
A report conducted in 1987 showed the oil and gas industry accounted for at least half of the total costs of corrosion in the United States [1]. There is competition between chemical reaction, mechanical wear, and this passive tribo-film formation [13,14,15,16,17,18,19,20,21,22,23] All these studies reveal the nature of corrosive wear’s complexity. Lubricants 2021, 9, 52 the combination of corrosion and wear have focused on aggressive wear conditions where plastic deformation took place under a high contact pressure. This research aims to obtain a fundamental understanding of the formation of surface failure in corrosive environtook place under a high contact pressure. The unique corrosive wear behavior found in this paper differs from that of corrosion wear on their own
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