公开(公告)号：US20240175111A1

公开(公告)日：2024-05-30

申请号：US18179362

申请日：2023-03-07

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Chaofang DONG ,  Li WANG ,  Decheng KONG ,  Shiyuan ZHANG ,  Yucheng JI ,  Xiaogang LI

IPC: C22C33/02 ,  B22F10/28 ,  B22F10/64 ,  B33Y10/00 ,  B33Y40/20 ,  B33Y70/00 ,  B33Y80/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/48

CPC classification number: C22C33/0207 ,  B22F10/28 ,  B22F10/64 ,  B33Y10/00 ,  B33Y40/20 ,  B33Y70/00 ,  B33Y80/00 ,  C22C33/0285 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/48 ,  B22F2201/02 ,  B22F2301/35 ,  B22F2998/10 ,  B22F2999/00

Abstract: An additively manufactured high-strength and high-ductility stainless steel is characterized in that the composition, by weight percentage, C≤0.05 wt %, Si≤1 wt %, Mn≤1 wt %, Cr 14.5-15.5 wt %, Ni 5.0-5.5 wt %, Cu 4-4.5 wt %, Nb 0.35-0.45 wt %, and the balance of Fe and unavoidable impurities. And Cr equivalent of Creq=% Cr+% Mo+2.2% Ti+0.7% Nb+2.48% Al. Ni equivalent of Nieq=% Ni+35% C+20% N+0.25% Cu. The yield strength of the high-strength and high-ductility stainless steel ≥1270 MPa, the tensile strength ≥1380 MPa, and the elongation after fracture ≥15%.

公开(公告)号：US20220178007A1

公开(公告)日：2022-06-09

申请号：US17498779

申请日：2021-10-12

Applicant: University of Science and Technology Beijing

Inventor： Zhiyong LIU ,  Xiaogang LI ,  Wei WU

IPC: C22C38/50 ,  C22C38/42 ,  C22C38/48 ,  C22C38/00 ,  C21D8/00

Abstract: A binary alloy design method for a marine high-strength low-alloy (HSLA) stress corrosion-resistant steel is provided. The binary alloy design method permits synergistic inhibition of anodic dissolution and hydrogen embrittlement by binary alloying to prepare the marine HSLA stress corrosion-resistant steel, the marine HSLA stress corrosion-resistant steel has an increase of more than 50% in stress corrosion resistance in a simulated SO2 polluted marine atmospheric environment. Microalloying of one element is carried out to improve properties of a rust layer on a surface of a HSLA steel in a marine environment and reduce a electrochemical activity in a local microenvironment to inhibit the anodic dissolution. Microalloying of another element is carried out to reduce a cathodic hydrogen evolution, to increase a hydrogen trap density and to decrease a multiplicative hydrogen diffusion channel density as well as enhance a hydrogen resistance of a structure to inhibit the hydrogen embrittlement.

公开(公告)号：US20170058391A1

公开(公告)日：2017-03-02

申请号：US15070287

申请日：2016-03-15

Applicant: University of Science and Technology Beijing

Inventor： Xiaogang LI ,  Xuequn CHENG ,  Chaofang DONG ,  Cuiwei DU ,  Dawei ZHANG

IPC: C23C10/40 ,  C22C38/02 ,  C22C38/20 ,  C22C38/04 ,  C22C38/28 ,  C22C38/22

CPC classification number: C23C10/40 ,  C22C38/02 ,  C22C38/04 ,  C22C38/20 ,  C22C38/22 ,  C22C38/28 ,  C23C10/60

Abstract: This present invention provides a method for preparing a stainless reinforcing steel bar resistant to corrosion of chloride ions, and belongs to the technical field of corrosion-resistant materials. This method particularly comprises the steps of: selecting a reinforcing steel bar blank, and performing oil removing, rust removing, water washing, and drying treatments on the surface of the reinforcing steel bar blank to be treated, or directly performing sand blasting or shot blasting on a reinforcing steel bar blank whose surface is only slightly rusted; placing the reinforcing steel bar blank in a chromium-containing environment, and keeping at a certain temperature for a certain time such that chromium in the environment is capable of diffusing into the surface of the reinforcing steel bar blank to form a chromium-containing diffusion layer, wherein an area in the diffusion layer where the weight content of Cr exceeds 12% meets the basic component requirements for a stainless steel, and this area is the effective diffusion layer described in this invention; and performing cooling treatment on the heat diffusion treated reinforcing steel bar. In this invention, a reinforcing steel bar blank is pre-formed, a heat diffusion technique is optimized, and the corrosion resistance to chloride ions of the stainless reinforcing steel bar of this invention is superior to that of the 316L stainless reinforcing steel bar.

Abstract translation: 本发明提供一种耐氯离子腐蚀的不锈钢钢筋的制备方法，属于耐腐蚀材料的技术领域。 该方法特别包括以下步骤：选择加强钢筋坯料，并在待处理的钢筋坯料的表面进行除油除锈，水洗和干燥处理，或直接进行喷砂或喷丸处理 在表面仅生锈的钢筋坯料上; 将加强钢筋坯料放置在含铬环境中，并在一定温度下保持一定时间，使得环境中的铬能够扩散到钢筋坯料的表面，形成含铬扩散层 其中，Cr的重量含量超过12％的扩散层的面积满足不锈钢的基本成分要求，该面积是本发明中描述的有效扩散层; 对热扩散处理的钢筋进行冷却处理。 在本发明中，预先形成钢筋坯料，优化热扩散技术，本发明的不锈钢钢筋对氯离子的耐腐蚀性优于316L不锈钢钢筋。

公开(公告)号：US20230408398A1

公开(公告)日：2023-12-21

申请号：US17936946

申请日：2022-09-30

Applicant: University of Science and Technology Beijing

Inventor： Dawei Zhang ,  Lingwei Ma ,  Chenhao Ren ,  Jinke Wang ,  Xiaogang LI

IPC: G01N17/00

CPC classification number: G01N17/006

Abstract: The present disclosure discloses a process for evaluating a corrosion inhibitor based on a high-throughput corrosion chip. In the present disclosure, a high-throughput corrosion chip is first prepared by using a chip spotter, and only a corrosion inhibitor and a corrosive substance need to be spotted on a metal sample to quickly, efficiently, and accurately evaluate performance of a corrosion inhibitor formulation, to meet corrosion test conditions such as different substances, different concentrations, and different corrosion duration; and then a corrosion degree of each measurement point in the high-throughput corrosion chip is identified and quantified by using a laser scanning confocal microscope. The high-throughput corrosion chip prepared by using the foregoing method can bear 10-1000 measurement points, and these measurement points can reflect corrosion effects of different inhibitor formulations in different corrosion duration.

公开(公告)号：US20220118563A1

公开(公告)日：2022-04-21

申请号：US17268638

申请日：2020-09-29

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Zhiyong LIU ,  Baozhuang SUN ,  Xiaogang LI ,  Yedong HE

IPC: B23P6/00 ,  G01N17/00 ,  B23K15/00

Abstract: A repair method for self-detecting and self-healing of corrosion defects in metals can achieve self-detecting and self-healing repair of an initial corrosion defect and be used to repair a micron-level corrosion defect. Furthermore, the self-detecting and self-healing repair method can be used to effectively repair an initial corrosion defect in a large-sized high-precision structural component, thus effectively improving the service safety of the high-precision metal structural component and prolonging the service life of the same.

公开(公告)号：US20220315772A1

公开(公告)日：2022-10-06

申请号：US17519188

申请日：2021-11-04

Applicant: University of Science and Technology Beijing

Inventor： Dawei ZHANG ,  Lingwei MA ,  Fan ZHANG ,  Di XU ,  Jinke WANG ,  Yao HUANG ,  Xiaogang LI

IPC: C09D5/16 ,  C09D7/61 ,  C09D7/40 ,  C09D7/80 ,  C01B32/168 ,  C01B33/12

Abstract: Disclosed are a superhydrophobic coating with abrasion resistance and a preparation method thereof. The coating has a composite structure formed by a nanohybrid composed of nano-SiO2 and multi-wallet carbon nanotubes, and a resin as a matrix.