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RE co-permeating surface anticorrosion treatment process of high-speed railway track fastener

A high-speed railway and surface treatment technology, applied in the direction of solid-state diffusion coating, metal material coating process, coating, etc., can solve the problems that other mechanical properties are difficult to meet the requirements, the comprehensive performance cannot meet the requirements, and the hardness of the surface anti-corrosion layer is low, etc. problems, to achieve the effect of high anti-atmospheric rainwater corrosion performance, increased compactness, and good anti-corrosion performance

Inactive Publication Date: 2007-01-03
哈尔滨市东方刃具厂有限公司
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

But there are still the following problems: a. The anti-corrosion ability of the product is poor, and the effective anti-corrosion period is short; b. The hardness of the surface anti-corrosion layer is low, the mechanical properties are poor, and the wear resistance is poor, resulting in defects such as low comprehensive performance of the product.
For this reason, Q235A high-quality low-carbon steel with high toughness is used for fasteners. Although the anti-corrosion performance of this low-carbon steel can meet the requirements after conventional nitriding surface treatment, the surface hardness is low, and other mechanical properties are difficult to meet the requirements. The performance is not up to the requirement

Method used

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specific Embodiment approach 1

[0015] Specific Embodiment 1: The surface treatment method of rare earth co-infiltration and anticorrosion of high-speed railway rail fasteners in this embodiment is as follows: raise the temperature of the low-temperature gas nitriding furnace to 570-680 ° C, and then place the Q235A low-carbon steel workpiece in the low-temperature gas In the nitriding furnace, after the temperature of the workpiece reaches the temperature in the furnace, methanol is introduced to exhaust the air in the furnace. After 30 to 60 minutes, the methanol or ethanol solution containing the rare earth infiltrating agent and ammonia gas are simultaneously passed into the nitriding furnace for rare earth co-production. Infiltration, control the gas volume ratio of ammonia gas to methanol or ethanol to be 1-2:1, the treatment time is 2-6 hours, and finally come out of the furnace and cool.

[0016] In this embodiment, the rare earth penetration agent accounts for 1 to 5% of the volume of the alcohol sol...

specific Embodiment approach 2

[0019] Specific implementation mode two: In this implementation mode, the rare earth penetration agent is composed of 3wt.% rare earth, 40wt.% ethylenediamine or formamide, 17%wt.% urea, 20%wt.% dihydroamine, 20wt.% composed of methanol or ethanol.

specific Embodiment approach 3

[0020] Specific embodiment three: In this embodiment, the rare earth penetrating agent is composed of 1wt.% rare earth, 30wt.% ethylenediamine or formamide, 20%wt.% urea, 19%wt.% dihydroamine, 30wt.% composed of methanol or ethanol.

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Abstract

The RE co-permeating surface anticorrosion treatment process of high-speed railway track fastener makes the fastener possess high comprehensive performance and service life over 10 years. The RE co-permeating surface anticorrosion treatment process includes the first raising the temperature of low temperature gas nitriding furnace to 570-680 deg.c, the subsequent setting the workpiece of Q235A low carbon steel inside the furnace, introducing methanol to eliminate air from the furnace, introducing methanol or ethanol solution of RE co-permeating agent and ammonia gas to co-permeate RE for 2-6 hr, and final discharging from the furnace and cooling.

Description

technical field [0001] The invention relates to a method for surface treatment of railway rail fasteners, in particular to a method for carrying out surface anticorrosion treatment on railway rail fasteners by using a rare earth co-infiltration process. Background technique [0002] There are as many as 20,000 pieces of high-speed and ordinary railway rails and gauge baffles per kilometer, and 8,800 pieces of road stud bolts. They are often corroded due to atmospheric and rainwater corrosion, leading to early failure and hidden dangers to driving safety. Therefore, the amount of daily maintenance is large. Therefore, high-quality surface anti-corrosion treatment is urgently needed to prevent corrosion, improve strength, prolong service life, and improve driving safety factor. [0003] There are many surface anti-corrosion treatment methods, and the surface nitriding treatment is more reliable after the evaluation by the railway department. The nitriding treatment has been su...

Claims

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Application Information

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IPC IPC(8): C23C8/28C23C8/80
Inventor 刘志儒闫牧夫
Owner 哈尔滨市东方刃具厂有限公司
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