A Study of Micro-Arc Oxidation Coatings on Aluminum Alloy Drill Pipe for Offshore Platform

Abstract

In order to enhance the corrosion resistance of a drill pipe for an offshore platform, micro-arc oxidation (MAO) coatings were deposited on the surface of an aluminum alloy drill pipe by MAO technology. The microstructure and anticorrosion performance of the MAO coatings were investigated experimentally. This paper mainly focuses on the experimental work to determine the influence of cathode voltage on the structural characteristics and corrosion resistance of MAO coatings. The results show that the cathode voltage has a significant effect on the preparation of MAO coating during the process. The surface of the coating becomes more compact and smooth with the increase of the cathode voltage. Furthermore, the anticorrosion performance of MAO coatings can effectively be improved with the increase of cathode voltage.

The influence of the conditions of microplasma processing (microarc oxidation in anode­cathode regime) of aluminum alloys on their phase composition

“…The electrolytes used are alkaline [20], so they are environmentally safer than chromium or sulfuric acid, which are commonly used in the anodizing process [21]. Microarc oxidation allows obtaining multifunctional ceramic-like modified layers with a wide range of properties, including wear-resistant [22], corrosion-resistant [23], heat-resistant [24], electrical insulating, and decorative [25].…”

Corrosion and Wear Behavior of WC–10Co4Cr Coating under Saturated Salt Drilling Fluid

“…Hence, a hard coating could be applied to the surface of the drill pipe or joint to improve its anti-corrosion and anti-wear [ 8 , 13 , 14 , 15 , 16 ]. There are several major coating methods to prepare hard coatings, such as high-velocity oxygen–fuel spraying [ 1 , 17 ], cold spraying [ 15 , 18 ], plasma spraying [ 19 ], micro-arc oxidation [ 20 , 21 ], high-speed laser cladding [ 22 ], high-power impulse magnetron sputtering [ 16 ], plasma electrolytic oxidation [ 23 ], and so on [ 13 , 24 ]. WC-based cemented carbide possesses high hardness, outstanding strength, and excellent toughness, so is widely used as anti-wear material [ 1 , 8 , 17 ].…”

Atmospheric and Marine Corrosion of PEO and Composite Coatings Obtained on Al-Cu-Mg Aluminum Alloy

“…The protection of structures in the marine environment is one of the major challenges in corrosion science. Aluminum alloys can be used in applications where weight efficiency is critical, such as high-speed boats, for offshore drilling pipes [1] or as a coating for protection of steel structures. Nowadays, Thermally Sprayed Aluminum (TSA) coatings are widely employed to protect steel components from corrosion in the marine environment [1][2][3][4].…”

“…Aluminum alloys can be used in applications where weight efficiency is critical, such as high-speed boats, for offshore drilling pipes [1] or as a coating for protection of steel structures. Nowadays, Thermally Sprayed Aluminum (TSA) coatings are widely employed to protect steel components from corrosion in the marine environment [1][2][3][4]. However, 45% of the damage in coatings by mechanical stresses is mainly generated during transport and erection operations [5] due to poor tribological properties of bare aluminum alloys: low load-bearing capacity and low abrasion resistance [6].…”