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Complex alloy permeation agent and method for preparing permeation layer

A technology of multi-component alloy co-infiltration and co-infiltration agent, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of insufficient corrosion resistance, poor corrosion resistance, hot-dip galvanizing pollution, etc. Achieve the effect of high production efficiency, long corrosion life and low corrosion rate

Inactive Publication Date: 2011-07-20
安徽天通达克罗涂复科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these methods, the corrosion resistance of the paint is poor, the coating is not well bonded, and it is easy to peel off; the corrosion resistance of Dacromet is very good, but the coating is thin and soft, not wear-resistant, and easy to peel off; the nitriding hardness is high and wear-resistant , the combination is good, but the corrosion resistance is not enough; hot-dip galvanizing can obtain a thick coating, but the surface quality is not high, and it is easy to nodulate, especially the groove of the threaded part is easy to be filled and cannot be used
At the same time, the pollution of hot-dip galvanizing is serious, the temperature is high and the energy consumption is high, and some parts such as spring bars are not suitable for use; the corrosion resistance of the hot-dip galvanizing layer cannot meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Zinc-aluminum-iron-lanthanum multi-alloy co-infiltration layer was prepared on Q235 round steel with thread (M16×860mm).

[0022] 1. Preparation of co-infiltration agent powder: 100kg

[0023] Take the following raw materials: zinc powder 12.5kg (12.5%), aluminum powder 4.8kg (4.8%), alumina powder 76.6 kg (76.6%),

[0024] Lanthanum hydroxide powder 6kg (6%), ammonium chloride 100g (0.1%);

[0025] Use an ordinary mixer to mix for 5-8 minutes in the atmosphere and at room temperature, put it in an oven at 140-180°C, and dry it for 15-20 minutes to obtain a co-penetration agent.

[0026] 2. Preparation process of zinc-aluminum-iron-lanthanum multi-alloy co-infiltration layer

[0027] Process route: workpiece pretreatment→workpiece loading into furnace, adding co-infiltration agent→converter heating and heat preservation for co-infiltration→cooling to temperature and workpiece out of furnace;

[0028] a. Workpiece pretreatment: The pretreatment process before heat inf...

Embodiment 2

[0038] Zinc-aluminum-iron-lanthanum multi-alloy co-infiltration layer was prepared on Q235 round steel with thread (M16×860mm).

[0039] 1. Preparation of co-infiltration agent powder: 100kg

[0040] The formula of co-infiltration agent is as follows: zinc powder 18kg (18%), aluminum powder 5.8kg (5.8%), alumina powder balance 68.5 kg (68.5%), lanthanum hydroxide powder 7.5kg (7.5%), ammonium chloride 200g (0.2%).

[0041] The preparation method of co-penetration agent is the same as that in Example 1.

[0042] 2. Preparation process of zinc-aluminum-iron-lanthanum multi-alloy co-infiltration layer

[0043] Thermal infiltration process conditions: converter speed 4r / min, temperature 390±20°C, holding time 3h after reaching temperature.

[0044] Others are with embodiment 1.

[0045] 3. Verification result:

[0046] The thickness of the zinc-aluminum-iron-lanthanum multi-alloy co-infiltration layer on the surface of the Q235 round steel thread (M16×860mm) is about 60±5μm, ...

Embodiment 3

[0051] Zinc-aluminum-iron-lanthanum multi-alloy co-infiltration layer was prepared on Q235 round steel with thread (M16×860mm).

[0052] 1. Preparation of co-infiltration agent powder: 100kg

[0053] The formula of co-infiltration agent is as follows: zinc powder 27.5kg (27.5%), aluminum powder 6.8kg (6.8%), alumina powder 56.8 (56.8%), lanthanum hydroxide powder 8.5kg (8.5%), ammonium chloride 400g (0.4 %).

[0054] The preparation method of co-penetration agent is the same as that in Example 1.

[0055] 2. Preparation process of zinc-aluminum-iron-lanthanum multi-alloy co-infiltration layer

[0056] The thermal infiltration process conditions are as follows: the rotating speed of the converter is 6r / min, the temperature is 430±20°C, and the holding time after reaching the temperature is 4h.

[0057] Others are with embodiment 1.

[0058] 3. Verification result:

[0059] The thickness of the zinc-aluminum-iron-lanthanum multi-alloy co-infiltration layer on the surface of t...

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Abstract

The invention relates to a complex alloy permeation agent and a method for preparing a permeation layer, designed aiming at the surface antisepsis of common steel spare parts, such as railway track fasteners, bolts, elastic bars, concrete preembedded parts, and the like. The complex alloy permeation agent comprises zinc powder, aluminum powder, alumina powder, lanthanum hydroxide powder and ammonium chloride. The process line for preparing the permeation layer comprises the following steps of: pretreating a working piece; loading the working piece into a furnace and adding the permeation agent; heating a converter and keeping the temperature for permeation; and cooling the working piece when reaching a temperature and discharging the working piece. Heat penetration is carried out under confirmed process specifications so as to form corrosion-resistant and wearable complex alloy permeation layer with a certain thickness and a compact structure on the surface of the working piece. The invention has simple process and is easy to implement. A Zn-Al-Fe-La complex alloy permeation layer obtained by adopting the conventional process has the thickness about 100 micros, the hardness up to 240-320 HV and the salt-air corrosion up to 680 h.

Description

technical field [0001] The invention belongs to the technical field of multi-element alloy co-infiltration, that is to use the permeation and interdiffusion effect of metal atoms in a heated state to infiltrate zinc, aluminum and lanthanum elements into iron and steel parts under the condition that the temperature is lower than the phase transition temperature of the matrix metal and the melting temperature of zinc On the surface, a multi-component composite alloy protective layer is formed to greatly improve and enhance the corrosion resistance, oxidation resistance and wear resistance of the surface of steel parts. In particular, it relates to a multi-component alloy co-infiltration agent and a method for preparing a co-infiltration layer. Background technique [0002] Railway track equipment, bolts, spikes, track fasteners and catenary fittings are installed in the open air, exposed to wind, sun, rain, severe cold, high temperature, rain, sandstorms, severe air pollution,...

Claims

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Application Information

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IPC IPC(8): C23C10/52
Inventor 谭育学
Owner 安徽天通达克罗涂复科技有限公司
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