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Articles by J.K. Solberg
Total Records ( 2 ) for J.K. Solberg
  M. Williams , A.N. Nechaev , M.V. Lototsky , V.A. Yartys , J.K. Solberg , R.V. Denys , C. Pineda , Q. Li and V.M. Linkov
  A pre-treatment technique was developed to facilitate electroless deposition of palladium layers on the surface of metal hydride-forming alloys for increasing hydrogen absorption kinetics. The technique involved functionalization of the oxidized surface of the alloys by deposition of assembled layers derived from δ-aminopropyltriethoxysilane. This results in the formation of a surface assembly of adhesive functional groups for the immobilization of palladium as a unique catalyst for hydrogen sorption. The layers of δ-aminopropyltriethoxysilane aided immobilization of Pd nuclei, in the activation procedure of electroless deposition, by increasing the chemical adhesion. Pd electroless deposition on rare-earth metal hydride-forming alloys, without δ-aminopropyltriethoxysilane pre-treatment, facilitated the deposition of Pd agglomerates, whereas the use of δ-aminopropyltriethoxysilane pre-treatment facilitated the deposition of continuous Pd layers on the surface of the alloy resulting in dramatic improvements in hydrogen sorption performances, including faster kinetics of hydrogenation of the non-activated material under mild conditions, compared to that observed for non-activated unmodified starting materials and materials surface modified by Pd electroless deposition without the additional δ-aminopropyltriethoxysilane pre-treatment step. The attractiveness of aminosilane pre-treatment for improvement of hydrogen sorption properties of rare earth–nickel-based AB5 alloys, and the influence of the differences in surface structure between deposited Pd agglomerates and layers was demonstrated.
  D.C. Lou , J.K. Solberg , O.M. Akselsen and N. Dahl
  In the present work, pure nickel (99.5%) and a Ni-superalloy (Nimonic 90) have been boronized by a self-protective paste, and the effect of the boronizing parameters on the phase constituents (type and morphology) has been investigated. For the Nimonic 90 alloy, the experimental results showed that the employed temperature and time have no evident effect on the phase constituents of the boride layers, i.e., CrB and Ni2B. By contrast, the growth of CrB was substantially influenced by the temperature and time, as was also the microhardness of the boride layer. Based on these observations, optimum temperature and holding time were determined for boronizing of Nimonic 90. For both pure Ni and Nimonic 90, the surface microhardness of the two materials was significantly raised after boronizing, i.e., from 100 HV0.1 to 1100 HV0.1 and from 400 HV0.1 to 2500 HV0.1 for the two alloys, respectively. In addition, seawater corrosion tests indicated that the corrosion resistance of the boronized pure nickel was slightly improved, while the corrosion resistance of boronized Nimonic 90 was somewhat reduced.
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