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Sulfate-induced degradation is one of the most important factors influencing the durability of concrete. The paper aims to clarify the transport-deterioration process of sulfates in concrete and thus to explain the mechanism and the deterioration of concrete by sulfates.

This paper presents an experimental study into the evolution of the transport-deterioration process of sulfate ions in concrete in a pure soaking environment.

The microscopic morphology of individual concrete layers at different depths and the change law of the sulfate ion concentration at the corresponding depths were investigated for different exposure times. Furthermore, the relationship between the changes in microstructure and the transport characteristics of the sulfate ions was studied.

A method to calculate the cracking level sulfate ion concentration was proposed.

This paper aims to study the corrosion behavior of molybdate conversion coatings on AZ31 magnesium alloy in NaCl solution.

The open circuit potential curves, anodic polarization curves, electrochemical impedance spectroscopy and immersion tests were used to study the corrosion behavior of molybdate conversion coatings on AZ31 magnesium alloy in NaCl solution.

The molybdate conversion coatings were homogeneous and uniform. The corrosion resistance of AZ31 magnesium alloy had been improved evidently through the molybdate conversion treatment.

The molybdate conversion coatings possess favorable feasibility in practice for the corrosion protection of AZ31 magnesium alloys in NaCl solution.

This paper aims to improve the corrosion resistance performance and stability of PbO₂ electrodes in chloride wastewater.

The morphology of PbO₂-ZrO₂ nanocomposite electrodes was observed by scanning electron microscopy (SEM). The open circuit potential (OCP) curves, anodic polarization curves, electrochemical impedance spectra, accelerated life tests, weight-loss tests and reusability tests were used to study the corrosion resistance properties and stability of PbO₂-ZrO₂ nanocomposite electrodes in NaCl solution.

SEM showed that the surface morphology of PbO₂-ZrO₂ nanocomposite electrodes became compacted and smooth. Electrochemical tests showed that ZrO₂ nanoparticles could increase the OCP, corrosion potential and charge transfer resistance, and decrease the corrosion current density in 3.5 Wt. per cent NaCl electrolyte solution. Besides, PbO₂-ZrO₂ nanocomposite electrodes showed high reusability for acetamiprid degradation, the accelerated service life could reach 146 h, which was almost 3.3 times longer than that of PbO₂ electrodes (44 h), weight-loss tests showed that the corrosion resistance for PbO₂-ZrO₂ nanocomposite electrodes was 2.3 times as compared to PbO₂ electrodes.

By the codeposition of ZrO₂ nanoparticles, the corrosion resistance performance and stability of PbO₂ electrodes in NaCl electrolyte were improved.

This paper aims to study the effect of SiO₂ nano‐particulates on the corrosion behaviour of Ni‐W/SiO₂ nanocomposite coatings.

Weight loss measurements, electrochemical measurements and scanning electron microscope were used to study the corrosion behaviour of Ni‐W/SiO₂ nanocomposite coatings in NaCl solution.

The incorporation of SiO₂ nano‐particulates into the Ni‐W alloy matrix significantly increased the corrosion resistance. The improvement in corrosion resistance was due to the SiO₂ nano‐particulates acting as physical barriers to the corrosion process by filling in crevices, gaps and microscopic holes on the surface of the Ni‐W alloy.

This study highlights the use of nano‐particulates for the control of Ni‐W alloy coating corrosion and opens a new route for industry in the anti‐corrosion field.