Prof. ZHANG Haiyang | Publications & Academic Profile | SinoTechIntel

Research Publications & English Decoded Briefs

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Surface Technology (表面技术)•2026•DOI: 10.16490/j.cnki.issn.1001-3660.2026.08.001

Research Progress on Chromium-free Passivation Technology for Galvanized Steel Sheets

Galvanized steel sheets are widely used in construction, automotive, appliance, and power industries due to their corrosion resistance, which can be further enhanced by passivation. Traditional chromate passivation, while effective due to self-repairing ability and chemical stability, poses severe health and environmental risks from hexavalent chromium. This review systematically categorizes recent chromium-free passivation technologies into inorganic, organic, and organic/inorganic composite systems. Inorganic systems include molybdates, rare earth salts (e.g., cerium, lanthanum), titanium salts, and silicates; organic systems include silanes, tannic acid, and acrylic resins. Film formation mechanisms and anticorrosion properties are examined. Individual systems exhibit limitations: molybdate films have micro-defects and limited thickness uniformity; rare earth films crack upon drying; organic films offer flexibility and adhesion but insufficient barrier properties. Organic/inorganic composite passivation integrates inorganic barrier function with organic interfacial binding and functional regulation, significantly improving film integrity and durability. The review concludes with challenges and prospects for chromium-free passivation.

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International Journal of Mining Science and Technology•2026•DOI: 10.1016/j.ijmst.2025.10.009

Long-term creep of Beishan granite under uniaxial compression

Investigations into the long-term creep behavior of Beishan granite in uniaxial compression were conducted. Four levels of axial stress (60, 70, 87, and 95 MPa) were applied to rock specimens. Contrasting with earlier research, the long-term creep data in this work present a substantial advancement in the time dimension. Except for the sample subjected to 60 MPa axial loading, which did not fail after a loading duration of 1650 d, the specimens under the other three stresses all failed after sustained constant loading durations of 1204, 1023, and 839 d, respectively. A lower envelope of driving stress-ratio for crystalline rocks was obtained, tending towards approximately 0.45 over an infinite time scale. According to the experimental results, as axial stress increases, both the axial strain accumulated in the transient creep process and the strain rate associated with steady-state creep deformation increase exponentially; however, the share of steady-state creep strain remains nearly constant at about 82.53 %. A novel damage-based creep model was put forward. It provides an enhanced depiction of the comprehensive creep process in rocks, notably improving the accuracy in forecasting the accelerated creep phase, which significantly impacts the long-term stability of engineering structures.

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