Sheradizing method and anti-corrosion metal part

A metal parts, anti-corrosion technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of high reaction activation energy, difficult reaction, slow reaction, etc., to achieve high economic benefits, A wide range of applications, the effect of improving the penetration speed

Active Publication Date: 2020-11-03
YANCHENG KEAO MECHAICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesium is an element with a large atomic diameter, and it is almost impossible to have a substitution reaction with iron. A substitution reaction with zinc requires a higher reaction activation energy, and the reaction is more difficult or the reaction is slower.

Method used

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  • Sheradizing method and anti-corrosion metal part
  • Sheradizing method and anti-corrosion metal part
  • Sheradizing method and anti-corrosion metal part

Examples

Experimental program
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Effect test

Embodiment 1

[0055] This embodiment provides a method for sherardizing, including steps S1 to S3.

[0056] S1. Carry out degreasing and derusting treatment on the metal parts to be galvanized, and place the treated metal parts together with the zinc-seeding agent in a closed seepage tank, and the zinc-seeding agent includes the following components in parts by mass: metal powder 20-100 parts, 40-80 parts of dispersant, and 0.2-5 parts of decomposing agent, wherein the metal powder includes 60-97 parts of zinc powder and 3-40 parts of magnesium powder.

[0057] On the one hand, the atomic radius of zinc is 0.1332 nanometers, and the atomic half-valence of magnesium is 0.1598 nanometers. The difference between the atomic radii of the two is less than 15%. At the same time, both magnesium and zinc have a close-packed hexagonal structure, so the two can work together to form a seepage layer. Although magnesium itself is not resistant to corrosion, it can occupy some positions of zinc atoms in ...

Embodiment 2

[0087] On the basis of Example 1, this embodiment provides a zinc sherardizing method, the zinc sherardizing agent used in step S1 may also include 0.5-3 parts of an active agent capable of promoting magnesium infiltration into the infiltration layer, such as 0.5 part, 1 part , 1.5 copies, 2 copies, 2.5 copies, 3 copies, etc., this application does not limit this.

[0088] Specifically, the active agent is preferably a magnesium halide, and the magnesium halide includes at least one of magnesium chloride, magnesium fluoride, magnesium iodide, and magnesium bromide.

[0089] Since the magnesium halide is always in the solid state during the powder zinc sherardizing process, it can fully contact and react with the surface of the iron and steel parts and the seepage layer, so that the infiltration of magnesium is easier to achieve, and adding magnesium halide as an activator can promote the rapid and effective infiltration of magnesium. In the infiltrated layer, the interaction b...

Embodiment 3

[0092] On the basis of embodiment 1 or 2, this embodiment provides a kind of sherardizing method, and the sherardizing agent adopted in its step S1 can also include manganese dioxide, and the mass fraction of manganese dioxide is not greater than the mass fraction of decomposer Number, specifically, the mass fraction of manganese dioxide can be 0-3 parts, such as 0.01 part, 0.05 part, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 1 part, 1.5 part, 2 parts, 2.5 copies, 3 copies, etc., depending on the specific circumstances, this application does not limit this.

[0093] In practical applications, adding manganese dioxide to the zinc sherardizing agent can act as a catalyst for the infiltration reaction of magnesium, which promotes the diffusion of magnesium into the seepage layer by reacting with the ammonia halide as a decomposing agent. First, the ammonia halide is decomposed at high temperature to obtain ammonia and hydrogen halide gas, and then the hydrogen halide gas ...

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Abstract

The invention provides a sheradizing method and an anti-corrosion metal part. The sheradizing method comprises the steps that S1, oil and rust removal treatment is carried on a metal piece to be subjected to sheradizing, the treated metal piece and a sheradizing agent are jointly placed in a closed sheradizing tank, wherein the sheradizing agent comprises the following components of, in parts by mass, 20-100 parts of metal powder, 40-80 parts of a dispersing agent and 0.2-5 part of a decomposing agent, and the metal powder comprises 60-97 parts of zinc powder and 3-40 parts of magnesium powder; S2, air in the closed sheradizing tank is expelled, and a valve of the closed sheradizing tank is turned off; And S3, the closed sheradizing tank is heated to preset temperature, then hydrogen is introduced for pressurization until a preset hydrogen pressure condition is reached, heat preservation is carried out for 1-10 h, a sheradizing layer is formed on the surface of the metal piece, and sheradizing is completed. The sheradizing method is simple to operate, convenient to use, low in cost, high in economic benefit and wide in application range.

Description

technical field [0001] The present application relates to the technical field of chemical heat treatment on the surface of metal materials, in particular to a zinc shedding method and anti-corrosion metal parts. Background technique [0002] Zinc sherardizing is a chemical heat treatment process that infiltrates the surface of metal materials with zinc. Zinc treatment on the surface of metal materials can significantly improve its ability to resist atmospheric corrosion. Among them, powder zinc sherardizing is widely used in the surface anticorrosion treatment of metal parts because of its advantages of no hydrogen embrittlement, high bonding strength, and good corrosion resistance. At present, most of the global railway fasteners and high-strength fasteners are protected by powder sherardizing and anti-corrosion treatment. [0003] The existing powder zinc sherardizing technology still has the problem of low corrosion resistance. After zinc sherardizing agent is used to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/52
CPCC23C10/52Y02P10/20
Inventor 乐林江沈伟乐政
Owner YANCHENG KEAO MECHAICAL
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