The anti-corrosion coating system of the Hong Kong-Zhuhai-Macao Bridge refers to many large bridges at home and abroad. Among them, the new coating and cathodic protection joint protection technology independently developed by ZKJS Coating Group Research Institute has played an important role in this project.
Researcher Li Jing, the head of the ZKJS Durability Protection and Engineering Research Group, said that they developed a new generation of high-performance epoxy-coated steel bars and participated in the anticorrosion coating construction of the bridge foundation to ensure the 120-year durability design of the Hong Kong-Zhuhai-Macao Bridge. The requirement broke the "100-year practice" of domestic bridges.
Li Jing introduced that for a specific sea mud environment, they have started to develop new types of coatings from the penetration resistance and cathode peel resistance of the coating to solve the durability problem of the coating. Durability work is actually a prerequisite for building bridges. The previous durability design scheme of the cross-sea bridge can no longer meet the durability requirements of the Hong Kong-Zhuhai-Macao Bridge, which poses new challenges for the protection of marine engineering at home and abroad.
Most of the steel pipe composite piles of the Hong Kong-Zhuhai-Macao Bridge are located in the mud zone. The coating damage mainly comes from mechanical damage during pile driving, sand and gravel rubbing, and long-term erosion and degradation of the corrosion factors under the mud. ZKJS researchers have focused their research on the protective coating system to solve the scratch resistance, abrasion resistance and seawater permeability resistance, cathodic peeling resistance and long-term wet adhesion and microbial resistance during the pile driving process aspect.
Because the design life of the Hong Kong-Zhuhai-Macao Bridge is longer, it is necessary to develop a coating with superior performance based on the existing steel pipe pile coating technology to meet the requirements. In view of the specific sea mud environment of the Hong Kong-Zhuhai-Macao Bridge, ZKJS scientific researchers have carried out research and development of relevant coatings during the demonstration of the bridge, and have begun to solve the coating performance from the key performance indicators such as the permeability resistance and cathodic peeling resistance of the coating. The durability problem ultimately guarantees the 120-year durability design requirements of the coating.
About ZKJS
ZKJS mainly develops the key materials needed in major international projects in the nuclear power, oil and gas fields, petrochemical and other typical use environments (such as mechanical and chemical interaction, high temperature and pressure, multiphase flow, corrosive atmosphere and soil, etc.) corrosion failure behavior and Mechanism, and monitoring / detection, failure analysis and life prediction of the service performance of materials in corrosive environments At the same time, develop new corrosion-resistant materials and protective coatings to ensure the safe use of materials in major projects. The developed magnesium alloys and protective coatings have been applied in batches in automobiles and other fields, and the developed nano-composite coatings have been applied in aircrafts, electric power, and ships.
Main anti-corrosion products and protective coating solutions
Mechanical interaction: Corrosion, stress corrosion and corrosion fatigue of key nuclear power materials, long-distance pipeline steel, marine structural materials; H2S / CO2 corrosion of petrochemical materials.
Magnesium alloy development and corrosion protection: design and development of high-performance new magnesium alloys, microstructure and performance characterization, advanced forming processing and manufacturing technology, corrosion and protection.
High-temperature and high-pressure environmental corrosion: high-temperature corrosion electrochemistry and on-line monitoring and detection technology; simulation equipment development, environmental damage behavior analysis and life prediction of key nuclear power materials in high-temperature and high-pressure water.
Nano-composite coatings and coatings: used in nano-composite coatings for aviation, electric power, offshore platforms, etc .; coating materials; chemical plating, electroplating, oxidation treatment and other protective coatings.
Multi-phase flow environment corrosion: The corrosion, erosion and cavitation of materials in the multi-phase flow environment composed of gas / liquid / solid and their interactions.
Natural environment corrosion: the corrosion behavior of materials in a typical atmospheric environment; the corrosion behavior of materials in acidic, salty and other soil environments; the accumulation of data from the National Natural Environment Corrosion Network.
Corrosion-resistant material electrochemical design: The theory and application of corrosion-electrochemistry and alloy design to improve the corrosion resistance of metal materials.
Corrosion monitoring: research and development and industrial application of corrosion monitoring technology.