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    Home > Coatings News > Paints and Coatings Market > Industry | The global cost of corrosion is about 4 trillion US dollars How to deal with the challenge of ocean corrosion?

    Industry | The global cost of corrosion is about 4 trillion US dollars How to deal with the challenge of ocean corrosion?

    • Last Update: 2021-04-30
    • Source: Internet
    • Author: User
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    In 2018, global natural disaster losses totaled 160 billion U.
    S.
    dollars, but the cost of corrosion in the same year was much higher than this value, about 3-4 trillion U.
    S.
    dollars.
    Under the action of external factors, all materials have corrosion problems, making the cost very high.
    China’s corrosion costs "According to the World Corrosion Organization statistics, global corrosion costs account for 3%-5% of GDP per year, and engineering equipment must be used for corrosion protection.
    " In the recently held "Marine Area Protection High-end Seminar", the National Metal Corrosion Control Project Center Director Han Enhou introduced the corrosion control technology of marine equipment.
    Han Enhou, director of the National Metal Corrosion Control Engineering Center , is the "culprit" causing corrosion "The culprit" causing corrosion The "culprit" causing corrosion The corrosion of marine equipment is closely related to the marine environment.
    The corrosion of marine equipment is closely related to the marine environment.
    The corrosion of marine equipment is closely related to the marine environment.
    Marine environment includes atmospheric environment, sea water environment, sea mud area, marine life, etc.
    Among them, the atmospheric environment is susceptible to corrosion of equipment due to the evaporation of seawater, which is filled with chlorine and magnesium plasma, and is also affected by sunlight and sea breeze.
    Regarding the sea mud area, some of the oil exploration and offshore wind power installations are exposed to the sea mud environment, and they are also subject to microbial corrosion.
    The temperature, oxygen content, PH value, and salt concentration of the seawater in the middle area will all change with the depth of the ocean.
    Therefore, the marine environment is very complicated.
    In addition, the growth of marine organisms will reduce the speed of ships, increase the load-bearing capacity of ocean platforms, and accelerate corrosion.
    Corrosion is the interaction of materials, mechanics and environment.
    "Marine material corrosion is the interaction between the marine environment and the material.
    " Han Enhou said that the corrosion rate of materials is different under different conditions.
    Therefore, it is necessary to grasp the corrosion rate of materials under different conditions.
    .
           The main factor affecting the safety of offshore engineering structures comes from corrosion.
    From the perspective of corrosion of marine engineering equipment, one type is uniform corrosion, and the other type is localized corrosion.
    Local corrosion includes pitting corrosion, stress corrosion, corrosion fatigue, corrosion wear, microbial corrosion, carbon dioxide corrosion, etc.
    Different from uniform corrosion, local corrosion prediction is very difficult, so it cannot be responded to in time after damage is caused.
    Local corrosion greatly affects the service safety of marine engineering equipment.
    "It is necessary to master various local corrosion laws, and then build models for prediction after mastering the laws.
    " Han Enhou believes that it is necessary to understand the stress and local corrosion conditions of materials and engineering equipment, and grasp the damage laws caused by the interaction of materials, mechanics and environment.
    , So as to predict possible risks in advance.

    75em; text-indent: 2em; font-family: ; font-size: 16px; box-sizing: border-box; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);">Anti-corrosion measures should consider cost and convenience

    75em; text-indent: 2em; font-family: ; font-size: 16px; box-sizing: border-box; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);">Anti-corrosion measures should consider cost and convenience

    75em; text-indent: 2em; font-family: ; font-size: 16px; box-sizing: border-box; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);">Anti-corrosion measures should consider cost and convenience

    75em; text-indent: 2em; font-family: ; font-size: 16px; box-sizing: border-box; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);">Anti-corrosion measures should consider cost and convenience

    Anti-corrosion measures should consider cost and convenience.
    Anti-corrosion measures should consider cost and convenience.
    The main countermeasures for equipment failure due to corrosion are various, including coating /plating, corrosion-resistant materials , surface treatment and modification, cathodic protection, corrosion inhibitors, Structural health monitoring and testing, safety evaluation and reliability analysis, and life assessment, etc.
    Coating anti-corrosion materials "The measures adopted depend on the cost and the service conditions during actual use.
    " Han Enhou introduced the protective effects of different measures.
    Coating treatment is the mainstream.
    Academician Ke Wei’s survey results show that it accounts for 75.
    6% of corrosion control measures in my country.
    Most of the corrosion that people see is electrochemical corrosion, and the occurrence of electrochemical corrosion requires conductors of water, ions and electrons, and the coating can block the diffusion of water, oxygen and corrosive ions into the protected material to achieve With the effects of anti-corrosion, anti-fouling, and drag reduction, marine steel structures such as ships, containers, bridges, docks, and offshore platforms all adopt this protective measure.
    Corrosion-resistant materials account for 12.
    5% ​​of corrosion control measures.
    Passive metals such as stainless steel and titanium alloys are corrosion-resistant materials.
    In the marine environment, because there is a passivation film layer of several nanometers thick, it can protect the base metal well; non-passive metals can form a stable rust layer , Based on uniform corrosion, life can be monitored.
    In terms of surface modification, chemical and physical methods are used to change the chemical composition or structure of the surface of the material or workpiece to improve the corrosion resistance of the component.
    Surface modification generally includes chemical heat treatment, laser remelting composite, ion implantation, nanometerization and so on.
    In terms of cathodic protection, it is pursued to reduce the corrosion current.
    "From the corrosion thermodynamic curve, once it enters the non-corrosive zone, no corrosion will occur.
    " But Han Enhou also said that too low a control potential will also cause hydrogen to enter and make the material brittle, so the cathodic protection potential should be appropriate.
    In terms of corrosion inhibitors, chemical substances with surface activity are first physically adsorbed on the metal surface, and then converted into chemical adsorption, occupying the active points on the metal surface, thereby achieving the effect of inhibiting corrosion.
    Life expectancy is the most difficult in the entire corrosion control process.
    Only by mastering the corrosion kinetics process, especially the process of local corrosion development kinetics, finding out the law and establishing a model, can accurate prediction be made.
    Han Enhou said, “Accelerating material performance tests under simulated service environment conditions in the laboratory is the key to understanding the law and obtaining predictive models.
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