Coating knowledge: R & D and product performance introduction of marine anticorrosive coating

It is pointed out that marine corrosion prevention is one of the key technologies of marine engineering SCC, he, CF and IC caused by metal corrosion in the sea will lead to the sudden fracture of marine steel structure, resulting in the ecological disaster of marine environment and huge losses In addition, the early failure of anticorrosive coating of marine products and the shutdown loss caused by coating maintenance are also considerable Therefore, appropriate anti-corrosion technology must be adopted to solve the problem In recent years, more and more attention has been paid to marine corrosion and protection at home and abroad Although a variety of seawater corrosion-resistant materials are constantly introduced, various corrosion-resistant construction technologies are also greatly developed Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Coating House News: marine corrosion prevention is one of the key technologies of marine engineering SCC, he, CF and IC caused by metal corrosion in the sea will cause sudden fracture of marine steel structure, resulting in marine environmental ecological disaster and huge loss In addition, the early failure of anticorrosive coating of marine products and the shutdown loss caused by coating maintenance are also considerable Therefore, appropriate anti-corrosion technology must be adopted to solve the problem In recent years, more and more attention has been paid to marine corrosion and protection at home and abroad Although a variety of seawater corrosion-resistant materials are constantly introduced and various corrosion-resistant construction technologies are greatly developed, they are still far from meeting the actual needs There is an obvious gap between the research of anti-corrosion of marine engineering structures and facilities in China and the developed countries in the world Some key technologies have not been solved yet There is no technology with independent intellectual property rights in China, and there is a lack of corresponding anti-corrosion specifications and standards, which seriously affect the design, construction and safe operation of marine engineering structures Therefore, in view of the common and key anti-corrosion problems faced by China's key sea areas and major marine projects, the research on the long-term anti-corrosion key technology of marine engineering structures and facilities can not only prevent the occurrence of corrosion, avoid or reduce the maintenance and maintenance costs in later service and economic losses caused by maintenance, reduce the occurrence of major malignant accidents, but also enable the marine engineering to The safety of the construction is greatly improved, which is of great significance 1 Requirements for marine anticorrosive coating marine anticorrosive coating refers to the anticorrosive coating used in the marine environment As the marine environment is very harsh and highly corrosive, marine anti-corrosion is an urgent research topic in the development of marine engineering in China According to the material and corrosion mechanism of the anti-corrosion object, the marine anti-corrosion coating can be divided into marine steel structure anti-corrosion coating and non steel structure anti-corrosion coating Marine steel structure anticorrosive coating mainly refers to the anticorrosive coating for large facilities such as transportation ships, containers, offshore bridges, port machinery, oil pipelines, offshore oil production platforms, etc., while non steel structure anticorrosive coating mainly refers to the anticorrosive coating for marine concrete structures Global coatings network has learned that marine anti-corrosion coatings mainly include inorganic zinc rich, organic zinc rich, organic silicon rich, epoxy, acrylic acid, polyurethane, fluorocarbon, polysiloxane coatings Different coatings and coating systems can be selected according to the corrosion characteristics and anti-corrosion life of different marine environment Marine anticorrosive coatings generally require the following properties: ① good physical properties Good impermeability to corrosive medium, good adhesion to steel surface; ② good mechanical properties It is resistant to sea water erosion, sea ice collision and abrasion of ship berthing; ③ it has excellent chemical properties It is resistant to seawater, salt fog, oil, chemicals and UV ④ it has good compatibility with electrochemical protection system The coating in splash zone and full immersion zone shall be resistant to cathodic stripping; ⑤ it shall have good construction performance It can carry out high-quality coating construction for different structures under various environmental conditions; ⑥ it meets the requirements of health, environmental protection and safety It is required that the solid content of the coating is high, and the VOC content meets the requirements of national or international standards; ⑦ other special requirements For example: the fresh water tank coating shall be non-toxic and meet the requirements of national health certification; the content of chlorine in the coating used for stainless steel surface shall not exceed 200mg / kg, and the coating shall not contain zinc; the ship ballast tank coating shall meet the requirements of the International Maritime Administration (IMO) standards for the performance of ship ballast tank protective coating; the coating below the ship waterline shall prevent the attachment of marine organisms, etc The main international standards of marine heavy anti-corrosion coating are: ① the corrosion protection of iso12944 protective coating system for steel structure; ② the surface treatment and protective coating of norsokm501; ③ the performance requirements of iso20340 offshore and related structure protective coating system; ④ the corrosion control of nacespo108 protective coating for offshore structure; ⑤ the performance standard of IMO ship ballast tank protective coating (PSPC) Marine anticorrosive coating and its coating matching usually meet the requirements of relevant anticorrosive standards of iso12944, norsokm501, nacespo108 and iso20340 Generally, it is required to pass strict corrosion test and certification in advance, and the test items mainly include: ① salt fog (salt water) resistance test 4000H; ② cathode stripping resistance test; ③ humidity heat resistance test 4000H; ④ cyclic corrosion test 4200h [1-4] 2 The research and development of key marine anticorrosive coatings are characterized by high technology content, long development cycle, large investment, high technical difficulty and high risk Overseas research and development of marine anticorrosive coatings are mainly concentrated in powerful large companies or departments supported by the government For example, IP in the United Kingdom, PPG in the United States, hemple in Denmark, Jotun in Norway and Kansai Paint in Japan all have hundreds of years of relevant paint development history They have formed a set of very strict and strict system in the aspects of paint production and supply, quality supervision, painting specification and painting site management At present, the products of these companies occupy the proportion of marine anticorrosive coatings in China Major markets [5] The production of marine anticorrosive coatings in China is mainly concentrated in Qingdao, Shanghai, Dalian, Tianjin, Changzhou, Guangzhou, Xiamen and other coating enterprises, and the research work is mainly concentrated in the Institute of marine research, the Institute of metal corrosion, the Research Institute of marine chemical industry, the Research Institute of Changzhou coatings of CNOOC, and the Research Institute of China Shipbuilding 725 In recent years, although the quality management and supervision organizations such as "Xiamen inspection station for marine coatings of China shipbuilding industry" and "Quality Supervision Center for marine coatings products" have been established, the overall technical level still lags behind the advanced countries At present, the research and development of marine heavy-duty anticorrosive coating abroad mainly focuses on the following aspects 2.1 long life due to more and more super large section steel The structure and the characteristics of the sea area do not have the conditions for direct repainting or returning to shore construction, so it is required to develop the marine anti-corrosion coating with an ultra long service life The most ideal service life of the coating, including the continuous service life after on-site direct coating maintenance, is equal to the service life of the steel structure equipment, that is, the coating and the equipment are designed with the same service life, and only a small amount of maintenance is required in use, no heavy Smear The coating zinc plating in Belgium belongs to the organic high zinc rich coating, and the metal zinc content in the dry film reaches 96% In the coastal marine atmospheric environment of Oslo, Norway, the average loss of coating is only 1 μ m every year after coating a single zinc coating with 120 μ m film thickness on the steel bridge for 15 years The most typical successful case of the application of inorganic zinc rich coating is the 250km long oil pipe project in Morgan wyala, Australia The single-layer water-borne inorganic zinc rich coating is used for its anticorrosion After more than 50 years, the coating is still in good condition without corrosion Exxon oil refinery built in sulfur globe Island adopts single-layer zinc silicate anticorrosive coating After 15 years, only a small part of the coating needs to be repaired, and after 4 years, it is intact without rust At present, the developed fluorocarbon coating and polysiloxane coating have achieved weather resistance of more than 15 years, such as the FEVE fluorocarbon paint produced by Asahi company, Japan, the FEVE fluorocarbon paint produced by Daikin company, the acrylic polysiloxane paint interfine979 produced by international paint company, and the epoxy polysiloxane paint psx700 produced by Ameron company, etc 2.2 low surface treatment coating has become one of the important research directions of anti-corrosion coating because the cost of pretreatment will account for 60% of the total coating cost Over the years, China's flooring industry has achieved remarkable development, and made outstanding contributions in economic development, improving people's livelihood, increasing employment, expanding exports and social welfare However, in recent years, some disadvantageous factors, such as inflation, human cost, real estate control and so on, make the survival of some small and medium-sized floor enterprises face great pressure How to further show the great vitality and competitiveness of flooring? 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