阅读说明：本技术 一种高硬度耐腐蚀的压铸锌合金 (High-hardness corrosion-resistant die-casting zinc alloy ) 是由 邓荣辉 李勇 于 2019-11-29 设计创作，主要内容包括：本发明提供了一种高硬度耐腐蚀的压铸锌合金,其特征在于,所述高硬度耐腐蚀的压铸锌合金的制备步骤如下：加入硅相重新熔炼、均匀化退火、清洗打磨、第一激光处理、第一碱腐蚀处理、第二激光处理、第二碱腐蚀处理、降温保存。本申请在制备好的Zn-xAl-yCu-zMg合金熔体中加入固态Al-12.6Si共晶铝硅后重新熔炼并均匀化退火,保证了压铸锌合金的韧性的同时又明显提高了锌合金的硬度,成分均匀,通过两次碱腐蚀处理和两次激光处理,并优化工艺参数,从而大幅度提高了压铸锌铝合金的表面硬度和耐腐蚀性,并且大幅度降低了腐蚀处理的总时间,提高了生产效率。(The invention provides a high-hardness corrosion-resistant die-casting zinc alloy which is characterized by comprising the following preparation steps: adding a silicon phase for remelting, carrying out homogenization annealing, cleaning and polishing, carrying out first laser treatment, carrying out first alkali corrosion treatment, carrying out second laser treatment, carrying out second alkali corrosion treatment, and cooling and storing. According to the method, solid Al-12.6Si eutectic aluminum silicon is added into a prepared Zn-xAl-yCu-zMg alloy melt, then the mixture is smelted again and annealed uniformly, the toughness of the die-casting zinc alloy is guaranteed, meanwhile, the hardness of the zinc alloy is obviously improved, the components are uniform, the surface hardness and the corrosion resistance of the die-casting zinc-aluminum alloy are greatly improved through two times of alkali corrosion treatment and two times of laser treatment, and the process parameters are optimized, so that the total time of the corrosion treatment is greatly reduced, and the production efficiency is improved.)

1. The die-casting zinc alloy with high hardness and corrosion resistance is characterized by comprising the following preparation steps:

firstly, adding a silicon phase to smelt again, firstly preparing a Zn-xAl-yCu-zMg alloy melt, then uniformly mixing the Zn-xAl-yCu-zMg alloy melt with an Al-12.6Si intermediate alloy at a smelting temperature, pouring the mixture into a room-temperature metal casting mold, and preparing a Zn-11Al-1.0Cu-0.05Mg-mSi die-casting zinc alloy;

step two, homogenizing annealing, namely homogenizing annealing is carried out on the die-casting zinc alloy obtained in the step one to obtain the die-casting zinc alloy after homogenizing annealing;

cleaning and polishing, namely cleaning the surface of the die-casting zinc alloy subjected to homogenizing annealing obtained in the step two, and polishing the surface of the die-casting zinc alloy subjected to homogenizing annealing to obtain the die-casting zinc alloy subjected to surface treatment;

step four, performing first laser treatment, namely performing first laser treatment on the die-casting zinc alloy obtained in the step three to obtain a die-casting zinc alloy after the first treatment;

fifthly, performing first alkali corrosion treatment, namely performing first alkali corrosion treatment on the die-casting zinc alloy obtained in the fourth step to obtain a die-casting zinc alloy after the first treatment;

step six, second laser processing, namely performing second laser processing on the die-casting zinc alloy obtained in the step five to obtain a die-casting zinc alloy after the second processing;

step seven, performing second alkali corrosion treatment, namely performing second alkali corrosion treatment on the die-casting zinc alloy obtained in the step six to obtain a die-casting zinc alloy after the second treatment;

and step eight, cooling and storing, namely washing the die-casting zinc alloy obtained in the step six, drying, packaging and warehousing.

2. The high-hardness corrosion-resistant die-cast zinc alloy according to claim 1, wherein: the smelting temperature in the first step is 600-700 ℃.

3. The high-hardness corrosion-resistant die-cast zinc alloy according to claim 1, wherein: m in the first step is 0.5-1.1.

4. The high-hardness corrosion-resistant die-cast zinc alloy according to claim 1, wherein: the homogenizing annealing process in the second step comprises the steps of annealing at the temperature of 400-450 ℃ under the pressure of 0.01-0.03Pa for 15-20 h.

5. The high-hardness corrosion-resistant die-cast zinc alloy according to claim 1, wherein: and in the third step, polishing and grinding the surface of the die-casting zinc alloy by using a shot blasting machine.

6. The high-hardness corrosion-resistant die-cast zinc alloy according to claim 1, wherein: the specific process of the first laser treatment in the fourth step is that the laser power is 50-60kW, the current is 300-500A, the pulse width is 3-5mm, and the defocusing amount is 100-120 mm.

7. The high-hardness corrosion-resistant die-cast zinc alloy according to claim 1, wherein: the concrete process of the first alkali corrosion treatment in the fifth step is that the alkali solution is a mixed solution of sodium hydroxide and potassium hydroxide, the corrosion treatment temperature is 70-90 ℃, and the corrosion treatment time is 5-8 hours.

8. The high-hardness corrosion-resistant die-cast zinc alloy according to claim 1, wherein: the specific process of the second laser treatment in the sixth step is that the laser power is 30-40kW, the current is 100-200A, the pulse width is 1-2mm, and the defocusing amount is 50-60 mm.

9. The high-hardness corrosion-resistant die-cast zinc alloy according to claim 1, wherein: the second alkali corrosion treatment in the seventh step is carried out by taking the alkali solution as a mixed solution of sodium hydroxide and potassium hydroxide, carrying out corrosion treatment at 70-90 ℃ for 3-4 h.

10. The high-hardness corrosion-resistant die-cast zinc alloy according to claim 1, wherein: and in the step eight, the drying temperature is 70-90 ℃, and the drying time is 1 h.

Technical Field

The invention relates to the technical field of nonferrous metal processing, in particular to a high-hardness corrosion-resistant die-casting zinc alloy.

Background

The zinc-based alloy is called magic alloy because of the advantages of simple smelting process, excellent mechanical property, casting property and processing property, outstanding wear resistance and the like, and becomes a new material with low price, energy conservation and high quality which is increasingly widely applied at home and abroad in recent decades. Zinc can be alloyed with various nonferrous metals, the most important of which is brass composed of zinc and copper, tin, lead, etc., and can also be die-cast with aluminum, magnesium, copper, etc. Zinc is mainly used in the fields of steel, metallurgy, machinery, electricity, chemical industry, light industry, military, medicine and the like.

The development of zinc alloy is mainly attributed to the invention of die-casting machine at the end of nineteenth century, the essence of die-casting is that under the action of high pressure, the liquid or semi-liquid metal is filled into die-casting mould cavity at higher speed, and is formed and solidified under pressure to obtain casting, compared with other casting methods, the die-casting has the advantages of good ① product quality, high size precision, good surface smoothness, high strength and hardness, stable size, good interchangeability, capability of die-casting thin-wall complex casting, high production efficiency of ②, high machine productivity, long service life of die-casting mould, one die-casting mould, high hardness and corrosion resistance, service life of die-casting zinc alloy which can reach dozens of thousands of times or even millions of times, easy realization of mechanization and automation, good economic effect of ③, because of the advantages of accurate size, smooth surface and the like of die-casting, direct use without mechanical processing or small processing amount, thereby not only improving metal utilization rate, but also reducing a large amount of processing equipment and man-hour, die-casting, and saving the cost by adopting combination of other metal materials and saving assembly man-hours.

The earliest zinc-based die casting alloys consisted of: zn-6% Sn-3% Cu-0.5% A1, mainly used to replace part of Sn-based products. The method is characterized in that: low strength, brittle nature, but good dimensional stability. Later research shows that the aluminum content is increased, the alloy has various improved properties, and the zinc-aluminum alloy series is produced. With the development and research of economy, the high-hardness corrosion-resistant die-casting zinc alloy produces a series of product brands, and until the twenty years, the development of the zinc-aluminum die-casting alloy reaches the full-holding period of the high-hardness corrosion-resistant die-casting zinc alloy, and the zinc-aluminum die-casting alloy is completely standardized.

With the continuous improvement of the scientific and technical level of China, the research on the zinc-aluminum alloy is more and more deep in China. Nevertheless, the research level and the production quality of the zinc-aluminum alloy in China have certain gaps compared with developed countries abroad, and the research on the zinc-based alloy in China has a long way.

At present, the main problems of the high-hardness corrosion-resistant die-casting zinc alloy are low hardness and poor corrosion resistance, and the industrial requirements are difficult to meet. Therefore, aiming at the problems of the die-casting zinc alloy with high hardness and corrosion resistance, the invention provides a die-casting zinc alloy with high hardness and corrosion resistance and high hardness and corrosion resistance.

Disclosure of Invention

In order to overcome the problem of poor hardness and corrosion resistance in the prior art, the invention provides the die-casting zinc alloy with high hardness and corrosion resistance.

The die-casting zinc alloy with high hardness and corrosion resistance is characterized by comprising the following preparation steps:

firstly, adding a silicon phase to smelt again, firstly preparing a Zn-xAl-yCu-zMg alloy melt, then uniformly mixing the Zn-xAl-yCu-zMg alloy melt with an Al-12.6Si intermediate alloy at a smelting temperature, pouring the mixture into a room-temperature metal casting mold, and preparing a Zn-11Al-1.0Cu-0.05Mg-mSi die-casting zinc alloy;

step two, homogenizing annealing, namely homogenizing annealing is carried out on the die-casting zinc alloy obtained in the step one to obtain the die-casting zinc alloy after homogenizing annealing;

cleaning and polishing, namely cleaning the surface of the die-casting zinc alloy subjected to homogenizing annealing obtained in the step two, and polishing the surface of the die-casting zinc alloy subjected to homogenizing annealing to obtain the die-casting zinc alloy subjected to surface treatment;

step four, performing first laser treatment, namely performing first laser treatment on the die-casting zinc alloy obtained in the step three to obtain a die-casting zinc alloy after the first treatment;

fifthly, performing first alkali corrosion treatment, namely performing first alkali corrosion treatment on the die-casting zinc alloy obtained in the fourth step to obtain a die-casting zinc alloy after the first treatment;

step six, second laser processing, namely performing second laser processing on the die-casting zinc alloy obtained in the step five to obtain a die-casting zinc alloy after the second processing;

step seven, performing second alkali corrosion treatment, namely performing second alkali corrosion treatment on the die-casting zinc alloy obtained in the step six to obtain a die-casting zinc alloy after the second treatment;

and step eight, cooling and storing, namely washing the die-casting zinc alloy obtained in the step six, drying, packaging and warehousing.

In a preferred embodiment of the present invention, the melting temperature in the first step is 600 to 700 ℃.

In a preferred embodiment of the present invention, m in the first step is 0.5 to 1.1.

In a preferred embodiment of the present invention, the homogenizing annealing process in the second step comprises annealing at 400-450 deg.C under 0.01-0.03Pa for 15-20 h.

In a preferred embodiment of the invention, in the third step, a shot blasting machine is used for polishing and grinding the surface of the die-casting zinc alloy.

In a preferred embodiment of the present invention, the specific process of the first laser treatment in the fourth step is that the laser power is 50-60kW, the current is 500A-.

In a preferred embodiment of the present invention, the first alkali etching treatment in the fifth step is performed by using a mixed solution of sodium hydroxide and potassium hydroxide as the alkali solution, wherein the etching treatment temperature is 70-90 ℃, and the etching treatment time is 5-8 hours.

In a preferred embodiment of the present invention, the specific process of the second laser processing in the sixth step is that the laser power is 30-40kW, the current is 100-.

In a preferred embodiment of the present invention, the second alkali etching treatment in the seventh step is performed by using a mixed solution of sodium hydroxide and potassium hydroxide as the alkali solution, wherein the etching treatment temperature is 70-90 ℃, and the etching treatment time is 3-4 hours.

In a preferred embodiment of the present invention, in the step eight, the drying temperature is 70-90 ℃, and the drying time is 1 h.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the method, solid Al-12.6Si eutectic aluminum silicon and fine silicon phases are added into a prepared Zn-xAl-yCu-zMg alloy melt, so that the hardness is improved, the alloy is remelted and annealed uniformly, the components of the die-casting zinc alloy are uniform, and the surface hardness and the corrosion resistance of the die-casting zinc-aluminum alloy are greatly improved through two times of alkali corrosion treatment and two times of laser treatment and process parameters are optimized, so that the total time of the corrosion treatment is greatly reduced, and the production efficiency is improved;

(2) a large amount of fine silicon phases are introduced into the zinc alloy by adopting solid Al-12.6Si eutectic aluminum silicon, so that the toughness is ensured, and the alloy hardness is obviously improved.

Drawings

Fig. 1 is a schematic flow diagram of a preferred embodiment of the high hardness corrosion resistant die cast zinc alloy of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a schematic flow chart of a preferred embodiment of the high-hardness corrosion-resistant die-casting zinc alloy of the present invention is shown, and the high-hardness corrosion-resistant die-casting zinc alloy is characterized in that the preparation steps of the high-hardness corrosion-resistant die-casting zinc alloy are as follows:

firstly, adding a silicon phase to smelt again, firstly preparing a Zn-xAl-yCu-zMg alloy melt, then uniformly mixing the Zn-xAl-yCu-zMg alloy melt with an Al-12.6Si intermediate alloy at a smelting temperature, pouring the mixture into a room-temperature metal casting mold, and preparing a Zn-11Al-1.0Cu-0.05Mg-mSi die-casting zinc alloy;

step two, homogenizing annealing, namely homogenizing annealing is carried out on the die-casting zinc alloy obtained in the step one to obtain the die-casting zinc alloy after homogenizing annealing;

cleaning and polishing, namely cleaning the surface of the die-casting zinc alloy subjected to homogenizing annealing obtained in the step two, and polishing the surface of the die-casting zinc alloy subjected to homogenizing annealing to obtain the die-casting zinc alloy subjected to surface treatment;

step four, performing first laser treatment, namely performing first laser treatment on the die-casting zinc alloy obtained in the step three to obtain a die-casting zinc alloy after the first treatment;

fifthly, performing first alkali corrosion treatment, namely performing first alkali corrosion treatment on the die-casting zinc alloy obtained in the fourth step to obtain a die-casting zinc alloy after the first treatment;

step six, second laser processing, namely performing second laser processing on the die-casting zinc alloy obtained in the step five to obtain a die-casting zinc alloy after the second processing;

step seven, performing second alkali corrosion treatment, namely performing second alkali corrosion treatment on the die-casting zinc alloy obtained in the step six to obtain a die-casting zinc alloy after the second treatment;

and step eight, cooling and storing, namely washing the die-casting zinc alloy obtained in the step six, drying, packaging and warehousing.

In a preferred embodiment of the present invention, the melting temperature in the first step is 600 to 700 ℃.

In a preferred embodiment of the present invention, m in the first step is 0.5 to 1.1.

In a preferred embodiment of the present invention, the homogenizing annealing process in the second step comprises annealing at 400-450 deg.C under 0.01-0.03Pa for 15-20 h.

In a preferred embodiment of the invention, in the third step, a shot blasting machine is used for polishing and grinding the surface of the die-casting zinc alloy.

In a preferred embodiment of the present invention, the specific process of the first laser treatment in the fourth step is that the laser power is 50-60kW, the current is 500A-.

In a preferred embodiment of the present invention, the first alkali etching treatment in the fifth step is performed by using a mixed solution of sodium hydroxide and potassium hydroxide as the alkali solution, wherein the etching treatment temperature is 70-90 ℃, and the etching treatment time is 5-8 hours.

In a preferred embodiment of the present invention, the specific process of the second laser processing in the sixth step is that the laser power is 30-40kW, the current is 100-.

In a preferred embodiment of the present invention, the second alkali etching treatment in the seventh step is performed by using a mixed solution of sodium hydroxide and potassium hydroxide as the alkali solution, wherein the etching treatment temperature is 70-90 ℃, and the etching treatment time is 3-4 hours.

In a preferred embodiment of the present invention, in the step eight, the drying temperature is 70-90 ℃, and the drying time is 1 h.