Video: Effect of Hydrogen Bake-Out on Copper Plated Alloy 718
- Deepak Kumar (Baker Hughes Incorporated) | Zhiyue Xu (Baker Hughes Incorporated) | Paul Agosta (Baker Hughes Incorporated) | Bill Bailey (Baker Hughes Incorporated)
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- Offshore Technology Conference
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- 2017. Copyright is retained by the author. This presentation is distributed with the permission of the author. Contact the author for permission to use material from this video.
- 4.2.3 Materials and Corrosion, 4 Facilities Design, Construction and Operation, 4.1.2 Separation and Treating, 4.1 Processing Systems and Design
- Nickel-base alloy, Hydrogen Embrittlement, Copper electroplating
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Copper electroplating is often used as an anti-galling surface treatment in the oil and gas industry, particularly on metal-to-metal sealing threads made from corrosion resistant alloys. It has been reported that during the plating process, hydrogen atoms may be generated in sufficient amount to embrittle the substrate. For high strength steels, a post-plating hydrogen bake out is recommended by the industry to drive out the hydrogen and restore ductility. A literature search on the efficacy of a bake out for precipitation-hardened (PH) nickel alloys produced no results. Therefore, a laboratory study was conducted to determine if a post-plating bake out on nickel alloy 718 is effective in removing hydrogen from the sample.
The study simulated a worst case hydrogen ingress scenario during commercial plating of alloy 718. Intentionally bad electroplating parameters (high cathode current density, low pH, and addition of sulfur and chloride ions impurities in the plating bath) were used to introduce hydrogen into the sample. Before plating, the samples were cathodically charged to simulate hydrogen ingress during the pre-cleaning or pickling step. After copper plating, the bake out parameters used were: 200°C or 400°C for 4 hours in air. The hydrogen depth profile in the samples was measured before and after the bake out by glow discharge optical emission spectroscope (GDOES). The results suggest that the hydrogen bake out did not remove the hydrogen from the alloy. Rather, a tighter control of the electro-plating solution and parameters is recommended to prevent the ingress of hydrogen in the first place.