Metal corrosion and the role of anti-corrosion coatings
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1 main application areas
Heavy-duty coatings are mainly used in harsh environments where corrosion problems are prominent and industrial sectors that are inconvenient for short-term maintenance. The application areas are as follows:
1 emerging marine projects: offshore facilities, coastal and bay structures, offshore oil drilling platforms;
2 modern transportation: highway guardrails, bridges, boats, containers, trains and railway facilities, automobiles, and airport facilities;
3 Energy industry: hydraulic equipment, water tanks, gas tanks, petroleum refining equipment, oil storage equipment (oil pipes, oil tanks), power transmission and transformation equipment, nuclear power, coal mines;
4 Large-scale industrial enterprises: papermaking equipment, medical equipment, food and chemical equipment, internal and external walls of metal containers, pipes of chemical industry, iron and steel plants, petrochemical plants, storage tanks, mine smelting, cement plant equipment, ground, walls and cement components with corrosive media.
5 Municipal facilities: gas pipelines and their facilities (such as gas cabinets), natural gas pipelines, drinking water facilities, garbage disposal equipment, etc.
1 The development of modern industry:
Created material conditions and a broad market for heavy anti-corrosion coatings, from land (such as heavy anti-corrosion coating has been extended to highways, urban rail transit, nuclear power plants, radio and television towers, etc.) to the ocean, from underground to space, from traditional industries to emerging Industry has provided a broad stage for heavy-duty coatings. For example, seawater desalination and seawater utilization projects have opened up a whole new field and market for heavy-duty coatings and applications. In the oil-producing Middle East, the sea is backed by the desert. It is a typical water-deficient region. To solve water sources, it mainly depends on desalination technology. Mining and oil-used industrial water also have to resort to water treatment projects for seawater use. According to statistics, in 1975, the world produced 2 million m3 of fresh water per day, and it reached 20 million m3 in 1994, which has increased 10 times in 20 years. The seawater desalination and seawater use facilities in the United States, Japan, and Israel must all face the corrosion of seawater. Due to the special nature of seawater corrosion, more stringent requirements have been put forward for heavy-duty coatings used in these facilities. As a result, water-repellent heavy-duty coatings for seawater desalination and seawater use emerged and will evolve. Due to the increasing application of heavy-duty coatings, heavy anti-corrosion coatings have been rapidly developed. In industrial advanced countries, heavy anti-corrosion coatings account for 5% to 7% of total coatings.
2 Promotion of environmental protection:
With the development of modern industry, the concentration of carbon dioxide and hydrocarbons in the atmosphere continues to increase. This not only leads to increased global temperatures, one-time pollution of the environment, but also some photochemical reactions between organic compounds and nitrogen oxides in the air. Produce toxic ozone, etc., causing secondary pollution poisoning more than one-off pollution. According to statistics, the world releases about 20 million tons of hydrocarbons into the atmosphere each year, most of which is paint coating. The amount of organic solvent discharged into the atmosphere for paint manufacturing is 2% of the coating amount, and the organic solvent that evaporates into the atmosphere during the coating process is 50% to 80% of the coating amount. In order to eliminate atmospheric pollution from paint coating, heavy-duty coatings are developing toward high solids content (currently, high solids solvent-based heavy-duty coatings, most of which are epoxy types), solvent-free, and water-based. Among them, high solids content and water-based properties are the key to the development and application of heavy-duty coatings. (The chlorinated rubber heavy-duty coating used in the Sydney Harbour Bridge has a solvent content of 500 g/L. Its solvent is volatilized into the atmosphere, causing serious pollution to the environment.)
Comprehensive performance of the varieties will be more widely used
Excellent overall performance includes:
1 excellent anti-corrosion performance: good adhesion, excellent anti-corrosion performance, long life. According to this requirement, Xianghe Paint Company developed and produced a new type of heavy-duty anti-corrosion coating that combines an epoxy-based heavy-duty coating and a chlorosulfonated polyethylene-based heavy-duty anti-corrosion coating to provide excellent resistance to acids, salt, and seawater. Anti-aging and other properties to meet the needs of the market.
2 Excellent construction performance: It can be cured at room temperature like a conventional anti-corrosion coating. The construction is simple and the unskilled can also operate. (The reason why chlorinated rubber heavy anti-corrosion coating can be applied in large quantities is mainly because of this). The construction of the heavy-duty anti-corrosion coating with the integration of epoxy and rubber by Xianghe Brand is basically the same as the construction of ordinary two-component epoxy anti-corrosive coating, and it is cured at room temperature so that the ordinary constructor can also grasp.
3 excellent environmental performance: the traditional solvent-based anti-corrosion coating solid content can only reach 50 ~ 60%, while the high solids heavy anti-corrosion coating solid content can be as high as 70% to 80%, or even 90% to 100%, solvent reduction Half, showing good environmental performance. The heavy-duty coating produced by Xianghe Company has a solid content of more than 75%, and some even as high as 90%. This not only reduces solvent pollution, but also reduces the cost of use.
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