The corrosive environment of sluice gate and its influencing factors

Nanyuan intelligent is specialized in the production and sales of various general valves and some non-standard valves, covering water treatment projects and some oil, gas and flue gas industries.

Since its establishment, Nanyuan Intelligent has begun to develop and produce various types and specifications of gates, including casting valves of various common specifications and steel gates of different specifications. Among them, cast iron gate has been used in many domestic projects, such as Tianjin Airport Phase II Central storm sewage Pumping station, Panjin No. 1 Sewage Treatment Plant renovation, Tianjin Drainage Management Project and MCC Tiangong Sewage Project, steel gate has Heze Hongyuan water supply project, Brunei sewage treatment project and Tangshan Happy Yugu project in 2016.

Steel sluice gates is hydropower stations and reservoirs, locks, lock to control the water level in the hydraulic structures such as important component, it will be submerged underwater for a long time, when opening and closing of dry-wet alternate frequently, to be washed by high speed water flow, especially in water by water, sunlight, and the function of aquatic organisms, but also by sea water, sediment, erosion and other debris of ice, it is easy to corrosion of steel, The bearing capacity of steel gate is significantly reduced and the safety of hydraulic engineering is seriously affected. Some use coating protection, generally use 3~5 years of failure, low efficiency, high maintenance costs.

Corrosion not only affects the safe operation of the structure, but also consumes a lot of manpower, material resources and financial resources to carry out corrosion prevention work. According to the statistics of some sluice projects, the annual expense for gate corrosion prevention accounts for about half of the annual maintenance cost, and at the same time, a large number of labor forces are mobilized to remove rust, paint or spraying. Therefore, in order to effectively control the corrosion of steel, prolong the service life of steel gate, and ensure the integrity and safety of water conservancy and hydropower projects, the long-term corrosion protection of steel gate has attracted extensive attention.

Corrosion environment and influencing factors of steel structure water gate:

Corrosion environment of steel sluice gate

Some steel sluice gates and steel structures in water conservancy and hydropower projects are immersed in various water quality (sea water, fresh water, industrial waste water, etc.) for a long time; Some due to the change of water level or the opening and closing of the gate is often in the alternate environment of dry and wet: some will be affected by the impact of high-speed water flow and silt, floating objects, ice friction; Located on the surface of the water or water parts are also subjected to the moisture atmosphere of water evaporation and splashing water fog; Structures working in the atmosphere are also affected by sunlight and air. Because the working environment of hydraulic gate is bad and there are many influencing factors, it is necessary to analyze the corrosion factors.

Corrosion factor

(1) Climate factors: the water part of the steel structure sluice gate is prone to corrosion due to the action of sun and rain, damp atmosphere, etc.

(2) The surface state of steel structure: roughness, mechanical damage, holes, welding defects, gaps and so on have a great impact on corrosion.

(3) Stress and deformation: the greater the stress and deformation, the more corrosion.

(4) Water quality: fresh water salt content is low, the gate corrosion depends on its chemical composition and pollution differences; Seawater has high salt content and good electrical conductivity. It contains a large number of chloride ions and is highly corrosive to steel and steel. The corrosion of steel gate is more serious in seawater than in fresh water.

NANYUAN Intelligent is integrated in the production and sales of various general valves and some non-standard valves. Its business scope mainly includes water treatment projects and some oil, gas and flue gas industries. Since its establishment, Nanyuan Intelligent has begun to develop and produce various types and specifications of gates, including casting valves of various common specifications and steel gates of different specifications. Among them, cast iron gate has been used in many domestic projects, such as Tianjin Airport Phase II Central storm sewage Pumping station, Panjin No. 1 Sewage Treatment Plant renovation, Tianjin Drainage Management Project and MCC Tiangong Sewage Project, steel gate has Heze Hongyuan water supply project, Brunei sewage treatment project and Tangshan Happy Yugu project in 2016. Steel sluice gates is hydropower stations and reservoirs, locks, lock to control the water level in the hydraulic structures such as important component, it will be submerged underwater for a long time, when opening and closing of dry-wet alternate frequently, to be washed by high speed water flow, especially in water by water, sunlight, and the function of aquatic organisms, but also by sea water, sediment, erosion and other debris of ice, it is easy to corrosion of steel, The bearing capacity of steel gate is significantly reduced and the safety of hydraulic engineering is seriously affected. Some use coating protection, generally use 3~5 years of failure, low efficiency, high maintenance costs. Corrosion not only affects the safe operation of the structure, but also consumes a lot of manpower, material resources and financial resources to carry out corrosion prevention work. According to the statistics of some sluice projects, the annual expense for gate corrosion prevention accounts for about half of the annual maintenance cost, and at the same time, a large number of labor forces are mobilized to remove rust, paint or spraying. Therefore, in order to effectively control the corrosion of steel, prolong the service life of steel gate, and ensure the integrity and safety of water conservancy and hydropower projects, the long-term corrosion protection of steel gate has attracted extensive attention. Corrosion environment of steel structure sluice gate and its influencing factors: Corrosion environment of steel structure sluice gate some steel structure sluice gate and steel structure in water conservancy and hydropower projects are immersed in various water quality (seawater, fresh water, industrial waste water, etc.) for a long time; Some due to the change of water level or the opening and closing of the gate is often in the alternate environment of dry and wet: some will be affected by the impact of high-speed water flow and silt, floating objects, ice friction; Located on the surface of the water or water parts are also subjected to the moisture atmosphere of water evaporation and splashing water fog; Structures working in the atmosphere are also affected by sunlight and air. Because the working environment of hydraulic gate is bad and there are many influencing factors, it is necessary to analyze the corrosion factors. Factors of corrosion: climate factors: steel structure water gate water parts susceptible to sun and rain, humid atmosphere, etc. The surface state of steel structure: roughness, mechanical damage, holes, welding defects, gaps and so on have a great impact on corrosion. ⑶ Stress and deformation: the greater the stress and deformation, the more corrosion. (4) Water quality: fresh water salt content is low, the gate corrosion depends on its chemical composition and pollution differences; Seawater has high salt content and good electrical conductivity. It contains a large number of chloride ions and is highly corrosive to steel and steel. The corrosion of steel gate is more serious in seawater than in fresh water.