Abstract
Fabrication of dense ceramic coating on steels is one of the most efficient methods to prevent hydrogen ingress into the structural materials. In this study, a dense graphene oxide (GO)-reinforced AlPO4 composite layer on a Cr2O3 coating was successfully fabricated by the dip coating method. The effects of GO content on the microstructure, phase compositions, mechanical and hydrogen isotope barrier properties were investigated. The results show that GO can effectively improve the mechanical properties of the double-coated specimens and the GO-reinforced AlPO4 composite layer has a positive effect on the improvement of deuterium permeation resistance. The 0.050 GO-AlPO4/Cr2O3 sample with a dense and uniform double-coating structure demonstrates the best overall performance. The microhardness, bonding strength, corrosion voltage, and corrosion current can reach 317.3 HV, 21.5 MPa, −77 mV, and 3.92 × 10−9 A·cm−2, respectively. In addition, the deuterium permeability reduction factor (PRF) in the temperature range of 450–550 °C is greatly improved. This enhancement can be attributed to the chemical inertness and barrier effect of GO and the synergy effects of GO-reinforced AlPO4 layer and Cr2O3 layer. As the test temperature rises to 600 °C, the phase transition of Cr2O3 is observed, and the phase transition process is revealed by thermodynamic method.
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