A Preview of the “14th Five-Year Plan” for New Materials—Trends in China’s New Materials Development

A Preview of the “14th Five-Year Plan” for New Materials—Trends in China’s New Materials Development

Materials are the material foundation of all human production and daily life, and have always served as a hallmark of productive forces. The ability to understand and harness materials determines the form of society and the quality of people’s lives. New materials, in turn, constitute the cornerstone for the development of strategic emerging industries.

08

2020

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04

Rust-Resistant Categories and Their Characteristics

Rust-Resistant Categories and Their Characteristics

Effectively preventing rusting of metal parts and equipment, current anti-rust methods can broadly be categorized into four main types: 1. Modifying the corrosion resistance by altering the internal microstructure of the metal. This approach focuses on the metal material itself, transforming its internal microstructure into that of alloy steels, stainless steels, and the like. Typically, during steelmaking, alloying elements such as silicon, manganese, chromium, vanadium, titanium, boron, tungsten, molybdenum, or rare earth elements are added to iron, enabling these elements to bond with the iron and thereby enhancing its corrosion resistance. 2. Surface conversion coatings and “permanent” surface coatings. This method can be further divided into chemical and electrochemical conversion coatings, including oxidation, phosphating, chromate conversion, fluorination, and others.

21

2016

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06

Zinc-Nickel Diffusion Coating Metal Anti-Corrosion Technology Project

Zinc-Nickel Diffusion Coating Metal Anti-Corrosion Technology Project

The “Zinc-Nickel Diffusion Coating Metal Anti-Corrosion Technology,” independently developed by our company, has been adopted in large quantities for major national projects—including Chongqing Light Rail, the subways of Guangzhou, Shenzhen, Chongqing, and Chengdu, the Guangzhou–Wuhan High-Speed Railway, and the Yu-Sui Double-Track Railway—thanks to its unique superior performance in high corrosion resistance, high hardness, and excellent wear resistance, as well as its energy-saving, environmentally friendly, zinc-efficient, and cost-effective process advantages. At the 5th Urban Rail Transit Sustainable Development Forum held in Beijing in 2009, this technology attracted attention from relevant experts and was hailed as a significant breakthrough in anti-corrosion technology for rail transit metal components. We recommend that this technology be promoted nationwide. Urban rail transit metal components are exposed outdoors for long periods, enduring not only sun and rain but also—

21

2016

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06

Development of Anti-corrosion Coatings

Development of Anti-corrosion Coatings

Development of Anti-corrosion Coatings 1. Products Are Moving Toward Multi-functionality According to incomplete statistics, China boasts more than 1,000 varieties of anti-corrosion coatings. Traditionally, these coatings are classified by resin type, including epoxy, epoxy asphalt, asphalt, chlorinated rubber, chlorosulfonated polyethylene, polyvinyl chloride, polyvinyl chloride acetate, phenolic resin, ethyl silicate, highly chlorinated polyethylene, polyurethane, polyurethane asphalt, phenolic, and alkyd paints, among others. In recent years, numerous modified resin-based anti-corrosion coatings with excellent performance have also emerged—for instance, alkyd resin-modified polysulfide rubber-modified epoxy waterproof and anti-corrosion coatings, as well as acrylic-modified alkyd magnetic paints used for railway passenger car bodies. Meanwhile, ...

21

2016

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06

Method for applying rust-preventive oil for rust-proofing treatment

Method for applying rust-preventive oil for rust-proofing treatment

Methods for applying rust-preventive oil: 1) Immersion Method: For small items, the surface is immersed in rust-preventive oil to ensure a layer of oil adheres to it. The thickness of the oil film can be controlled by adjusting the temperature or viscosity of the rust-preventive oil. 2) Brushing Method: This method is used for outdoor construction equipment or products with special shapes that are not suitable for immersion or spraying. When brushing, care must be taken to avoid buildup as well as to prevent missed spots. 3) Spraying Method: Some large rust-preventive objects cannot be coated by immersion. Typically, this method involves spraying with filtered compressed air at a pressure of approximately 0.7 MPa in a clean-air environment. The spraying method is suitable for solvent-diluted rust-preventive oils or thin coatings.

21

2016

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06

Heavy-duty anti-corrosion paint and coatings

Heavy-duty anti-corrosion paint and coatings

Throughout the development of the paint and coating industry to date, additive thinking has been the conventional approach to product innovation—a process that every industry must go through from its early stages to maturity. However, clearly driven by an impatient desire for quick results and short-term gains, we’ve taken additive thinking a bit too far, leading to a widespread phenomenon of conceptualized, wordy, and superficially revamped products that fail to deliver real innovation. This purely additive approach to product innovation has dominated the industry for nearly a decade, not only stifling our creativity and causing us to take product innovation for granted, thereby veering off course and heading down the wrong path—but also indirectly harming the healthy growth of most companies and brands. Initially, product innovation thinking was based on...

21

2016

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06

Passivation principle for rust prevention treatment

Passivation principle for rust prevention treatment

The mechanism of passivation can be explained by the film theory, which posits that passivation occurs when a metal reacts with an oxidizing agent, forming an extremely thin, dense, highly protective, and firmly adherent passivation film on the metal’s surface. This film exists as a distinct phase and is typically composed of compounds formed by the oxidation of the metal. It effectively isolates the metal completely from the corrosive medium, preventing direct contact between the metal and the corrosive environment, thereby essentially halting the metal’s dissolution and achieving a passive state that provides corrosion protection. Worldwide, approximately 15% to 20% of steel production is lost annually due to rusting, resulting in enormous economic losses and wasteful use of resources. Chongqing Dayou

21

2016

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06

What factors cause metal to rust despite rust-preventive treatments?

What factors cause metal to rust despite rust-preventive treatments?

(1) Atmospheric Relative Humidity: At the same temperature, the relative humidity is defined as the percentage of the actual water vapor content in the atmosphere compared to its saturation vapor content. Below a certain relative humidity, the corrosion rate of metals is very low; however, once the relative humidity exceeds this threshold, the corrosion rate increases sharply. This relative humidity is referred to as the critical humidity. For many metals, the critical humidity ranges between 50% and 80%, with steel having a critical humidity of approximately 75%. The atmospheric relative humidity has the greatest impact on the corrosion of metals treated for rust prevention. When the atmospheric humidity exceeds the critical humidity, a thin film of water or water droplets will form on the metal surface. If harmful impurities present in the atmosphere dissolve into this water film or droplets, an electrochemical reaction will occur.

21

2016

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06

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