Corrosion Behavior of B4C/6061Al Neutron Absorber Composite in Different H3BO3 Concentration Solutions

Abstract

Abstract:

In this study, electrochemical corrosion tests, full-soak corrosion tests and associated microstructure analysis were conducted to investigate the corrosion behaviors of B₄C/6061Al neutron absorber composites (NACs) manufactured by powder metallurgy method in solutions having different boric acid (H₃BO₃) concentrations (500, 2500 and 10,000 ppm). In electrochemical corrosion tests, B₄C/6061Al NACs demonstrate the highest (short-term) corrosion resistance in the 2500 ppm H₃BO₃ solution. While for full-soak corrosion tests, the B₄C/6061Al NACs show the highest (long-term) corrosion resistance in the 500 ppm H₃BO₃ solution. This difference is found to be mainly due to the formation of different surface morphologies during these two different corrosion tests. As noticed, a layer of Al(OH)₃ was formed on the composite surface during full-soak corrosion tests, but it cannot be found in the electrochemical corrosion tests. The full-soak corrosion mechanism of the B₄C/6061Al NACs in the H₃BO₃ solution is found to be primarily determined by the dynamic balance between the formation and dissolution rates of the oxide film, which is mainly controlled by the density of H+ ions in the solution.

Key words: B₄C/6061Al, NACsPowder, metallurgyElectrochemical, corrosionFull-soak, corrosion

Yu-Li Li,Wen-Xian Wang,Hong-Sheng Chen,Jun Zhou,Qiao-Chu Wu. Corrosion Behavior of B₄C/6061Al Neutron Absorber Composite in Different H₃BO₃ Concentration Solutions[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(11): 1037-1046.

Figures/Tables 17

Fig. 1 Parameters of the B4C/6061Al NACs fabrication

Fig. 2 Triplanar optical micrograph illustrating the B4C particles distribution in the B4C/6061Al NACs

Fig. 3 SEM image and EDS line scan across the B4C/6061Al NACs

Fig. 4 a EDS analysis of the Si-rich precipitates; b SEM image of B4C/6061Al NACs after polarization test at 2500 ppm; c EDS analysis of B4C particles

Fig. 5 Corrosion morphology images: a particle of isolation and interfacial corrosion; b intergranular corrosion of Al alloy

Fig. 6 EDS spectrum of white sedimentation

Fig. 7 XRD spectra of white sedimentation

Fig. 8 Electrochemical corrosion tests results of B4C/6061Al NACs at different H3BO3 concentrations: a Tafel plot; b Nyquist plot

Fig. 9 Equivalent circuit diagram for the neutron absorber materials under electrochemical corrosion, Rs solution resistance, Q1 constant phase element (CPE) of the film, R1 resistance of the film, L low-frequency inductance and R2 resistance due to inductance

Fig. 10 Dry weight changes in the samples in three different corrosion tests at 40 °C

Fig. 11 SEM micrographs of corrosion surfaces of a 500 ppm; b 2500 ppm; c 10,000 ppm H3BO3 concentrations; d the galvanic coupling between Al/B4C

Fig. 12 Corrosion process schematic diagram of B4C/6061Al NACs

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Corrosion Behavior of B₄C/6061Al Neutron Absorber Composite in Different H₃BO₃ Concentration Solutions

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