Research Progress on the Corrosion Resistance of High-Entropy Alloy Coatings

Research Progress on the Corrosion Resistance of High-Entropy Alloy Coatings

This paper summarizes recent research on the corrosion resistance of high-entropy alloy coatings. The study primarily explores the effects of preparation processes, alloy compositions, and process parameters on the corrosion resistance of high-entropy alloys. It also offers suggestions regarding existing issues and key research directions for high-entropy alloy coatings with enhanced corrosion resistance. The authors of this work are Jia Chuntang, Sha Minghong, and others from the School of Materials and Metallurgy at Liaoning University of Science and Technology.

18

2020

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03

The six major defects in welding—along with their causes, hazards, and preventive measures—are all here.

The six major defects in welding—along with their causes, hazards, and preventive measures—are all here.

Surface defects (appearance defects) refer to imperfections that can be detected on the surface of a workpiece without the aid of instruments. Common surface defects include undercut, weld bumps, depressions, and welding distortion; sometimes, surface porosity and surface cracks may also be present. Additionally, incomplete root penetration in single-sided welds is another example of such defects.

17

2020

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03

Public Notice of the Completion Environmental Protection Acceptance Report for the Expansion Project of the Demonstration Base for Industrialization of Coating Materials and Anti-Corrosion Treatment Processing Services at Dayou Surface Technology Co., Ltd., Rongchang District, Chongqing Municipality

Public Notice of the Completion Environmental Protection Acceptance Report for the Expansion Project of the Demonstration Base for Industrialization of Coating Materials and Anti-Corrosion Treatment Processing Services at Dayou Surface Technology Co., Ltd., Rongchang District, Chongqing Municipality

On May 15, 2018, Dayou Surface Technology Co., Ltd. of Rongchang District, Chongqing Municipality, organized relevant units and experts to hold a completion acceptance meeting for the environmental protection aspects of the expansion project of the demonstration base for the industrialization of case-hardening materials and anti-corrosion treatment processing services at Dayou Surface Technology Co., Ltd. in Rongchang District, Chongqing Municipality. Participating units included the Rongchang District Environmental Protection Bureau of Chongqing Municipality and Chongqing Huankeyuan Boda Environmental Technology Co., Ltd. (the entity responsible for preparing the acceptance monitoring report). The acceptance team conducted on-site inspections and listened to presentations by the construction unit regarding the implementation of the environmental impact assessment and the “three simultaneous” system during the project’s construction. Chongqing Huankeyuan Boda Environmental Technology Co., Ltd.

18

2018

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05

Zinc-nickel plating anti-corrosion technology makes its debut at the 14th China International Modern Railway Technology and Equipment Exhibition in Shanghai.

Zinc-nickel plating anti-corrosion technology makes its debut at the 14th China International Modern Railway Technology and Equipment Exhibition in Shanghai.

From October 26 to October 29, 2017, the 14th China International Modern Railway Technology and Equipment Exhibition, hosted by the China Academy of Railway Sciences and China International Trade Center Co., Ltd., opened at the Shanghai Exhibition Center. Over 240 enterprises and organizations from 12 countries and regions participated in the exhibition. This year’s expo focused on themes such as “Smart Railways” and “New Railway Technologies,” contributing to the joint development of railway infrastructure under the Belt and Road Initiative. Chongqing Dayou Surface Technology Co., Ltd. was the sole invited exhibitor from the Guangzhou Railway (Group) Company’s Engineering Department.

13

2017

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11

The 2017 Science and Technology Conference of Chongqing Dayou Surface Technology Co., Ltd. was successfully held.

The 2017 Science and Technology Conference of Chongqing Dayou Surface Technology Co., Ltd. was successfully held.

At exactly 10:00 a.m. on February 18, 2017, Chongqing Dayou Surface Technology Co., Ltd. held its 2017 Science and Technology Work Conference in the company’s conference hall. All company leaders, heads of various departments, and all members of the technical department attended the meeting. The conference provided a comprehensive review of the company’s R&D activities, technical management, production upgrades, technical testing, and technical support work carried out in 2016, and set higher goals and requirements for the company’s science and technology efforts in 2017. (Group photo from the 2017 Science and Technology Work Conference) In his speech, Liu Xingzhi, Executive Deputy Director of the Technology Center, emphasized that the company’s science and technology work should be tailored to its own unique characteristics.

28

2017

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02

Hand in hand, with one heart—A Reflection on the 2017 New Year Gala

Hand in hand, with one heart—A Reflection on the 2017 New Year Gala

The new year is brimming with fresh goals and aspirations. The hopeful year 2017 is already striding confidently toward us. Looking back at the just-concluded year 2016, we see struggle, perseverance, joy, and achievements—most importantly, the hard work and dedication of each and every one of you. At 3 p.m. on January 25, 2017, the friendly football match between Chongqing Dayou and Rongchang Dayou kicked off in full swing. Amidst the enthusiastic cheers and shouts from the cheering squad on the sidelines, players from both teams battled fiercely on the green field. This wasn't just a passionate and energetic match; it was also a testament to the unwavering courage and tenacity displayed by many players, as well as a vivid demonstration of our collective unity and relentless determination to move forward together. Excitement!

08

2017

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02

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

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