Electroless Amorphous NiP Coatings Over API X70 Steel: Resistance to Wear and Hydrogen Embrittlement

다국어 초록 (Multilingual Abstract)

The present work discusses very good resistance to hydrogen embrittlement as well as wear resistance of NiP coated API(American Petroleum Institute) X70 steel as compared to the bare steel and electrolytic crystalline Ni coated steel. The NiPcoatings with three compositions (hypo, hyper and near-eutectic compositions), prepared by an electroless technique, werepredominantly amorphous. The relative wear behavior of the coatings was studied using ball-on disc tests in air. The hydrogenembrittlement susceptibility (HES) was assessed using slow strain rate tensile (SSRT) tests after cathodic hydrogen chargingof the coated as well as bare steel. The superior wear resistance of the NiP coated steels showed abrasive wear, whereas theNi-coated steel showed adhesive wear. Hyper and hypo-eutectic NiP coated steels showed a comparatively lower H-inducedembrittlement than the uncoated and Ni-electroplated steels and these could be attributed to the excellent hydrogen barrierproperty of the NiP coatings.

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