Application of Zinc and Aluminum Spraying for Corrosion Protection of Metal Structures such as Hydroelectric Power Station Gate Valves

For metal structures such as sluice gates in hydropower stations, including steel gates, trash racks, and embedded components of gate slots, which are exposed for long periods to alternating dry and wet conditions, submersion underwater, and continuous scouring by flowing water, these structures are subject to erosion from atmospheric factors, sunlight, temperature fluctuations, aquatic organisms, as well as impacts and abrasion caused by sediment and other floating debris. As a result, the steel surfaces are highly susceptible to corrosion. Once corrosion sets in, the load-bearing capacity of the steel structure gradually declines, seriously compromising the safe operation of the project. To effectively control steel corrosion and extend the service life of sluice gates, it is essential to adopt effective anti-corrosion measures. In hydropower station projects, all metal structures (except for the back sides of hoisting mechanisms and embedded components) shall be protected with hot-sprayed zinc coatings that offer long-term corrosion resistance. The process involves applying zinc spray followed by sealing with coatings and subsequent topcoating. For the back sides of gate slot embedded components, after sandblasting to remove rust, a cement-sand mortar containing a caustic soda solution shall be applied. To facilitate quality control during construction and ensure the effectiveness of the anti-corrosion treatment, the key technical requirements for hot-spraying zinc coatings in hydropower station projects have been formulated, drawing upon current national standards and relevant guidelines such as the "Code for Corrosion Protection of Metal Structures in Hydraulic Structures."

Category:

Hydropower and Water Resources

Key words :

防腐

金属结构

施工

水电站

闸门

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Product Description

Metal structures such as hydroelectric power station sluice gates Zinc and aluminum spray for corrosion protection Construction

Steel gates, trash racks, and gate slot embedded parts in hydraulic metal structures are exposed for long periods to alternating dry and wet conditions, submersion underwater, and the erosive effects of flowing water. They are also subjected to corrosion caused by atmospheric factors, sunlight, temperature fluctuations, aquatic organisms, as well as impact and abrasion from sediment and other floating debris, making the steel surfaces highly susceptible to corrosion. Once corrosion sets in, the load-bearing strength of the steel structure gradually declines, seriously compromising the safe operation of the project. To effectively control steel corrosion and extend the service life of the gates, it is essential to adopt effective anti-corrosion measures. In hydropower station projects, all metal structures (except for the back sides of hoisting mechanisms and embedded parts) are protected with a long-term anti-corrosion coating consisting of thermally sprayed zinc metal, supplemented by zinc spraying followed by sealing with coatings and topcoating with finish paints. For the back sides of gate slot embedded parts, after sandblasting to remove rust, a cement-sand mortar containing a caustic soda solution is applied. To facilitate quality control during construction and ensure the effectiveness of the anti-corrosion treatment, the key technical requirements for thermal-sprayed zinc metal application in hydropower station projects have been formulated, drawing upon current national standards and relevant documents such as the "Code for Corrosion Protection of Metal Structures in Hydraulic Structures."