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Materials 2017, 10(6), 632; doi:10.3390/ma10060632

Stability of an Electrodeposited Nanocrystalline Ni-Based Alloy Coating in Oil and Gas Wells with the Coexistence of H2S and CO2

1
School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
2
School of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, China
3
Shengli Oilfield Shengxin Antisepsis Co., Ltd., Dongying 257091, China
*
Author to whom correspondence should be addressed.
Received: 25 April 2017 / Revised: 7 June 2017 / Accepted: 7 June 2017 / Published: 9 June 2017
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Abstract

The stability of an electrodeposited nanocrystalline Ni-based alloy coating in a H2S/CO2 environment was investigated by electrochemical measurements, weight loss method, and surface characterization. The results showed that both the cathodic and anodic processes of the Ni-based alloy coating were simultaneously suppressed, displaying a dramatic decrease of the corrosion current density. The corrosion of the Ni-based alloy coating was controlled by H2S corrosion and showed general corrosion morphology under the test temperatures. The corrosion products, mainly consisting of Ni3S2, NiS, or Ni3S4, had excellent stability in acid solution. The corrosion rate decreased with the rise of temperature, while the adhesive force of the corrosion scale increased. With the rise of temperature, the deposited morphology and composition of corrosion products changed, the NiS content in the corrosion scale increased, and the stability and adhesive strength of the corrosion scale improved. The corrosion scale of the Ni-based alloy coating was stable, compact, had strong adhesion, and caused low weight loss, so the corrosion rates calculated by the weight loss method cannot reveal the actual oxidation rate of the coating. As the corrosion time was prolonged, the Ni-based coating was thinned while the corrosion scale thickened. The corrosion scale was closely combined with the coating, but cannot fully prevent the corrosive reactants from reaching the substrate. View Full-Text
Keywords: Ni-based alloy; nanocrystalline coating; electrodeposition; H2S/CO2 corrosion; corrosion scale Ni-based alloy; nanocrystalline coating; electrodeposition; H2S/CO2 corrosion; corrosion scale
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sui, Y.; Sun, C.; Sun, J.; Pu, B.; Ren, W.; Zhao, W. Stability of an Electrodeposited Nanocrystalline Ni-Based Alloy Coating in Oil and Gas Wells with the Coexistence of H2S and CO2. Materials 2017, 10, 632.

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