CN103757585B - Pure magnesium or Mg alloy surface diffusion coating kirsite method - Google Patents
Pure magnesium or Mg alloy surface diffusion coating kirsite method Download PDFInfo
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- CN103757585B CN103757585B CN201410025270.8A CN201410025270A CN103757585B CN 103757585 B CN103757585 B CN 103757585B CN 201410025270 A CN201410025270 A CN 201410025270A CN 103757585 B CN103757585 B CN 103757585B
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Abstract
The invention discloses a kind of pure magnesium or Mg alloy surface diffusion coating kirsite method, surface treated pure magnesium or magnesium alloy workpiece imbedded ram-jolt in the iron flask filling pure zinc powder, heats in then iron flask is put into heating furnace,.The pure magnesium of the present invention or Mg alloy surface diffusion coating kirsite method; ram-jolt in the iron flask of pure zinc powder is filled by the most surface treated pure magnesium or magnesium alloy workpiece embedment; guarantee that workpiece contacts with zinc powder closely; the thermal diffusion zincizing to pure magnesium or magnesium alloy work-piece surface is realized under air; break away from and carried out in vacuum or under the conditions of inert gas shielding; and shorten expansion and ooze time and temperature, it is to avoid matrix is grown up, the mechanical property of matrix reduces, surface occurs spot corrosion or the phenomenon of scaling loss；And the present invention is low for equipment requirements, processing ease, low cost, it is advantageously applied to commercial production.
Description
Technical field
The invention belongs to magnesium or Mg alloy surface corrosion and protection technical field, relate to a kind of pure magnesium or magnesium closes
Gold surface diffusion coating kirsite method.
Background technology
Magnesium and alloy thereof have good damping performance, can bear bigger impact shock load, have
Excellent machining and polishing performance, it is easy to casting.It addition, magnesium and alloy conductive thereof and heat conductivity
Good, shielding properties is excellent.In recent years, along with people are to resource and more concerns of environmental problem, magnesium and
Its alloy has become a kind of highly important modern industry structural material applications in automobile, machinery, aviation boat
My god, communication, the field such as optical instrument and computer.But, magnesium is one of active metal, magnesium and conjunction thereof
The natural oxide film of gold is the finest and close, it is impossible to adapts to most use environment, even if at room temperature, also can
Aoxidizing in atmosphere, oxide-film pH value is about 10.5, is unfavorable for application.Therefore magnesium and conjunction thereof
Gold is before use, it is necessary to carry out surface process.Owing to magnesium and alloy Performance comparision thereof are active, surface
The most oxidized, thus the surfacecti proteon of magnesium alloy is one of hot issue of Chinese scholars research.
Magnesium and alloy surface modifying technology thereof mainly have thermo-chemical treatment, gas phase deposition technology, ion implanting
Technology, hot-dip technology, laser melting coating and laser surface alloying technology etc..Wherein, thermo-chemical treatment
It is by penetrating into different elements at magnesium and alloy surface thereof, effectively changing the chemical composition of surface of the work
And tissue, to obtain various different surface property；Alloying layer thickness typically can be according to the technology requirement of workpiece
Regulate, and the composition of infiltration layer, tissue and performance from outward appearance to inner essence gradually change, infiltration layer and matrix
Belonging to metallurgical binding, top layer is difficult to peel off；The method is not limited by workpiece geometries, and
There is workpiece and deform the features such as little, precision is high, good stability of the dimension.It addition, the method is improving surface
While mechanical property, moreover it is possible to improve surface of the work hardness and decay resistance.
Chinese invention patent " induction heating method for alloying surface of Mg alloy " (application number:
02114635.7, publication number: 1397664, publication date: 2003-02-19) disclose a kind of sensing heating
Method for alloying surface of Mg alloy；" in stove, heat solid-state diffusion magnesium or magnesium alloy article surfaces alloy
Change method " (application number: 02114651.9, publication number: 1396298, publication date: 2003-02-12)
Disclose heating solid-state diffusion magnesium or magnesium alloy article surfaces alloyage process in a kind of stove.These patent tables
Modified or alloyage process the heating-up temperature in face is high (500～600 DEG C), and make magnesium and magnesium alloy workpiece 6～
42h is in the condition of high temperature for a long time, matrix not only can be promoted to grow up, the mechanical property of matrix reduces,
And there is a possibility that Mg alloy surface generation spot corrosion or scaling loss or make some alloy that burn-off phenomenon to occur.Separately
Outward, these methods generally use vacuum or carry out, the most not only to heating under the conditions of inert gas shielding
Equipment requirements is high and cost is high, energy consumption is big, is unfavorable for the actual application of industry.
Summary of the invention
It is an object of the invention to provide a kind of pure magnesium or Mg alloy surface diffusion coating kirsite method, solve
The heating-up temperature of existing alloyage process of having determined is high, time length causes matrix to be grown up, matrix mechanical property
The problem that can reduce.
The technical solution adopted in the present invention is, pure magnesium or Mg alloy surface diffusion coating kirsite side
Method, imbeds ram-jolt in the iron flask filling pure zinc powder, so by surface treated pure magnesium or magnesium alloy workpiece
After iron flask put into heating furnace in heat,.
The feature of the present invention also resides in,
Heating-up temperature is 400～470 DEG C, and heat time heating time is 4～20h.
Pure magnesium or Mg alloy surface processing procedure be: initially with 160～1200# abrasive paper for metallograph to pure magnesium or
Magnesium alloy workpiece polishing or polishing, remove spot and the plaque on surface so that it is surfacing, without substantially drawing
Trace, then cleans 3～8min in ultrasound wave ethanol, removes surface smut, subsequently at ultrasound wave acetone
Middle cleaning 3～8min, removes the Organic substance on surface, finally cleans with the deionized water of flowing and use heat
Wind dries pure magnesium or magnesium alloy workpiece.
The granularity of pure zinc powder is 10～100 μm, before using dries pure zinc powder.
The invention has the beneficial effects as follows,
The pure magnesium of the present invention or Mg alloy surface diffusion coating kirsite method, by surface treated pure
Magnesium or magnesium alloy workpiece imbed ram-jolt in the iron flask filling pure zinc powder, it is ensured that workpiece contacts tightly with zinc powder
Close, under air, realize the thermal diffusion zincizing to pure magnesium or magnesium alloy work-piece surface, broken away from only very
Problem that is empty or that carry out under the conditions of inert gas shielding, and shorten expansion and ooze the time, reduce temperature,
Avoid that matrix is grown up, the mechanical property of workpiece reduces and surface of the work spot corrosion or the phenomenon of scaling loss；
The present invention is low for equipment requirements, processing ease, and low cost is advantageously applied to commercial production.
The pure magnesium of the present invention or Mg alloy surface diffusion coating kirsite method, gained diffusion layer organization uniformly causes
Close, infiltration layer is metallurgical binding with pure magnesium or magnesium alloy workpiece, and surface-brightening has preferable decorative effect；
Its alloying layer thickness is 10～200 μm, and microhardness reaches 80～150HV0.2, relatively pure magnesium can improve 2～
4 times；Infiltration layer corrosion potential is-1.1～-1.4V, hence it is evident that higher than pure magnesium and the corrosion potential-1.5 of magnesium alloy～
-1.6V, pure magnesium and magnesium alloy can be played the effect of protection by infiltration layer.
Accompanying drawing explanation
Fig. 1 is the light microscopic micro-organization chart of the embodiment of the present invention 1 pure magnesium surface thermal diffusion zincizing infiltration layer；
Fig. 2 is the microhardness impression figure of the embodiment of the present invention 1 pure magnesium surface thermal diffusion zincizing infiltration layer；
Fig. 3 is that the embodiment of the present invention 1 pure magnesium surface thermal diffusion zincizing infiltration layer is in 3.5%NaCl solution
Potential polarization curve；
Fig. 4 is the X ray diffracting spectrum of the embodiment of the present invention 1 pure magnesium surface thermal diffusion zincizing infiltration layer.
Detailed description of the invention
The present invention is described in detail with detailed description of the invention below in conjunction with the accompanying drawings.
The pure magnesium of the present invention or Mg alloy surface diffusion coating kirsite method, specifically comprise the following steps that
Step 1, by granularity be 10～100 the pure zinc powders of μm dry, with remove the steam in zinc powder or its
Its organic impurities, then loads pure zinc powder in iron flask；
Step 2, uses 160～1200# abrasive paper for metallograph polish pure magnesium or magnesium alloy workpiece or polish,
Remove spot and the plaque on surface so that it is surfacing, without obvious cut, then in ultrasound wave ethanol
Clean 3～8min, to remove surface smut, in ultrasound wave acetone, clean 3～8min subsequently, to go
Except the Organic substance on surface, finally clean with the deionized water of flowing and use hot-air seasoning workpiece；
Step 3, imbeds the ferrum filling pure zinc powder by the pure magnesium processed through step 2 surface or magnesium alloy workpiece
Also ram-jolt in tank, to guarantee that workpiece contacts closely with zinc powder；
Step 4, inserts iron flask in heating furnace together with workpiece and heats, and heating-up temperature is 400～470 DEG C,
Heat time heating time is 4～20h,.
The pure magnesium of the present invention or Mg alloy surface diffusion coating kirsite method, by surface treated pure
Magnesium or magnesium alloy workpiece imbed ram-jolt in the iron flask filling pure zinc powder, it is ensured that workpiece contacts with zinc powder closely,
Under air, realize the thermal diffusion zincizing to pure magnesium or magnesium alloy work-piece surface, broken away from only in vacuum or
The problem carried out under the conditions of inert gas shielding, and shorten expansion and ooze the time, reduce temperature, keep away
Exempt from that matrix is grown up, the mechanical property of workpiece reduces and the showing of surface of the work generation spot corrosion or scaling loss
As；And the present invention is low for equipment requirements, processing ease, low cost, it is advantageously applied to commercial production.
The pure magnesium of the present invention or Mg alloy surface diffusion coating kirsite method, gained infiltration layer even compact,
Infiltration layer is metallurgical binding with pure magnesium or magnesium alloy workpiece, and surface-brightening has preferable decorative effect, and it oozes
Layer thickness is 10～200 μm, and microhardness reaches 80～150HV0.2, relatively pure magnesium can improve 3～4
Times, infiltration layer corrosion potential is-1.1～-1.4V, hence it is evident that higher than pure magnesium and the corrosion potential-1.5 of magnesium alloy～
-1.6V, pure magnesium and magnesium alloy can be played the effect of protection by infiltration layer.
Embodiment 1
Step 1, is that the 25 pure zinc powders of μm are dried by granularity, has removing the water vapour in zinc powder or other
Machine impurity, then loads pure zinc powder in iron flask；
Step 2, uses 160#, 280#, 400#, 800#, 1200# abrasive paper for metallograph to pure magnesium work successively
Part is polished or polishes, and removes spot and the plaque on surface so that it is surfacing, without obvious cut,
Then in ultrasound wave ethanol, clean 5min, to remove surface smut, clear in ultrasound wave acetone subsequently
Wash 5min, to remove the Organic substance on surface, finally clean with the deionized water of flowing and use hot blast to dry
Dry workpiece；
Step 3, fills in the iron flask of pure zinc powder also by the pure magnesium workpiece embedment after step 2 surface processes
Ram-jolt, to guarantee that workpiece contacts closely with zinc powder；
Step 4, inserts iron flask in heating furnace together with workpiece and heats, and heating-up temperature is 430 DEG C, heating
Time is 8h,.
The infiltration layer dense uniform of the pure magnesium workpiece that embodiment 1 obtains, shiny appearance, excellent anti-corrosion performance,
The corrosion potential of infiltration layer is-1.3754V, and hardness is 134HV0.2。
Expand and ooze the light microscopic metallographic structure photo of rear infiltration layer as it is shown in figure 1, as shown in Figure 1, infiltration layer and pure magnesium
Or magnesium alloy workpiece combines preferably, without hole.Fig. 2 is embodiment 1 pure magnesium surface thermal diffusion zincizing infiltration layer
Microhardness figure, learn that impression size is little, nitrided layer hardness is high.Embodiment 1 pure magnesium surface diffusion coating
Zinc infiltration layer potential polarization curve in 3.5%NaCl solution is as it is shown on figure 3, corrosion electrokinetic potential is
-1.3754V, than pure magnesium from corrosion electrokinetic potential 205.4mV(pure magnesium corrosion potential of having shuffled be
-1.5808V), and corresponding corrosion current density icorrFrom-9.508A/cm2(matrix) falls below
-16.409A/cm2(infiltration layer).Fig. 4 is the XRD figure of embodiment 1 pure magnesium surface thermal diffusion zincizing infiltration layer
Spectrum, shows there is the infiltration of Zn element in matrix and defines Mg7Zn3Phase, i.e. at pure magnesium sample table
Face defines intermetallic compound.The corrosion potential expanding the pure magnesium workpiece after oozing improves, corrosion current
Density reduces, and occurs the tendency of galvanic corrosion to reduce, and this shows the pure magnesium layer surface after expanding and oozing
Decay resistance strengthens.
Embodiment 2
Step 1, is that the 10 pure zinc powders of μm are dried by granularity, has removing the water vapour in zinc powder or other
Machine impurity, then loads pure zinc powder in iron flask；
Step 2, uses 160#, 280#, 400#, 800#, 1200# abrasive paper for metallograph to magnesium alloy successively
Workpiece is polished or polishes, and removes spot and the plaque on surface so that it is surfacing, without obvious cut,
Then in ultrasound wave ethanol, clean 3min, to remove surface smut, clear in ultrasound wave acetone subsequently
Wash 5min, to remove the Organic substance on surface, finally clean with the deionized water of flowing and use hot blast to dry
Dry workpiece；
Step 3, fills the magnesium alloy workpiece embedment after step 2 surface processes in the iron flask of pure zinc powder
And ram-jolt, to guarantee that workpiece contacts closely with zinc powder；
Step 4, inserts iron flask in heating furnace together with workpiece and heats, and heating-up temperature is 400 DEG C, heating
Time is 20h,.
Embodiment 3
Step 1, is that the 100 pure zinc powders of μm are dried by granularity, has removing the water vapour in zinc powder or other
Machine impurity, then loads pure zinc powder in iron flask；
Step 2, uses 160#, 280#, 400#, 800#, 1200# abrasive paper for metallograph to pure magnesium work successively
Part is polished or polishes, and removes spot and the plaque on surface so that it is surfacing, without obvious cut,
Then in ultrasound wave ethanol, clean 8min, to remove surface smut, clear in ultrasound wave acetone subsequently
Wash 3min, to remove the Organic substance on surface, finally clean with the deionized water of flowing and use hot blast to dry
Dry workpiece；
Step 3, fills in the iron flask of pure zinc powder also by the pure magnesium workpiece embedment after step 2 surface processes
Ram-jolt, to guarantee that workpiece contacts closely with zinc powder；
Step 4, inserts iron flask in heating furnace together with workpiece and heats, and heating-up temperature is 450 DEG C, heating
Time is 15h,.
Embodiment 4
Step 1, is that the 75 pure zinc powders of μm are dried by granularity, has removing the water vapour in zinc powder or other
Machine impurity, then loads pure zinc powder in iron flask；
Step 2, uses 160#, 280#, 400#, 800#, 1200# abrasive paper for metallograph to magnesium alloy successively
Workpiece is polished or polishes, and removes spot and the plaque on surface so that it is surfacing, without obvious cut,
Then in ultrasound wave ethanol, clean 6min, to remove surface smut, clear in ultrasound wave acetone subsequently
Wash 8min, to remove the Organic substance on surface, finally clean with the deionized water of flowing and use hot blast to dry
Dry workpiece；
Step 3, fills the magnesium alloy workpiece embedment after step 2 surface processes in the iron flask of pure zinc powder
And ram-jolt, to guarantee that workpiece contacts closely with zinc powder；
Step 4, inserts iron flask in heating furnace together with workpiece and heats, and heating-up temperature is 470 DEG C, heating
Time is 4h,.
Claims (2)
- The purest magnesium or Mg alloy surface diffusion coating kirsite method, it is characterised in that will be through surface The pure magnesium processed or magnesium alloy workpiece imbed ram-jolt in the iron flask filling pure zinc powder, are then put into by iron flask and add Heat in hot stove,；Described pure magnesium or Mg alloy surface processing procedure be: initially with 160～1200# abrasive paper for metallograph to pure Magnesium or magnesium alloy workpiece are polished or polishing, remove spot and the plaque on surface so that it is surfacing, without bright Aobvious cut, then cleans 3～8min in ultrasound wave ethanol, removes surface smut, subsequently at ultrasound wave Acetone cleans 3～8min, removes the Organic substance on surface, finally clean with the deionized water of flowing and adopt With the pure magnesium of hot-air seasoning or magnesium alloy workpiece；The granularity of described pure zinc powder is 10～25 μm, before using dries pure zinc powder.
- Pure magnesium the most according to claim 1 or Mg alloy surface diffusion coating kirsite method, its Being characterised by, in heating furnace, heating-up temperature is 400～470 DEG C, and heat time heating time is 4～20h.
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| CN105252138B (en) * | 2015-09-25 | 2017-07-28 | 哈尔滨工业大学 | A kind of surface of pure aluminum processing method for aluminium/nickel diffusion connection |
| CN107858638A (en) * | 2017-11-30 | 2018-03-30 | 西安理工大学 | A kind of foam magnesium or foam aluminum alloy surface heat diffusion-alloying method |
| CN110184635B (en) * | 2019-07-02 | 2020-10-09 | 四川轻化工大学 | Method for electroplating copper on surface of magnesium alloy |
| CN114000098B (en) * | 2020-07-28 | 2024-01-30 | 南通中国科学院海洋研究所海洋科学与技术研究发展中心 | Magnesium alloy surface zincating method with reusable penetrating agent and penetrating agent used by same |
| CN111962017B (en) * | 2020-08-25 | 2022-11-22 | 四川轻化工大学 | Method for preparing high-hardness metal layer on surface of magnesium alloy |
| CN112494725B (en) * | 2020-10-16 | 2023-01-31 | 珠海中科先进技术研究院有限公司 | Biodegradable composite material and preparation method and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1396298A (en) * | 2002-07-01 | 2003-02-12 | 西安建筑科技大学 | Surface alloying process of Mg or Mg-alloy product by heating and solid diffusion in furnace |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1396298A (en) * | 2002-07-01 | 2003-02-12 | 西安建筑科技大学 | Surface alloying process of Mg or Mg-alloy product by heating and solid diffusion in furnace |
Non-Patent Citations (1)
| Title |
|---|
| 镁及镁合金表面扩渗合金化的机理研究;张远芬;《中国优秀硕士学位论文全文数据库 工程科技I辑》;20050915(第5期);正文第15页第2-3段、第16页倒数第1段至第17页第2段、第17页倒数第1段至第18页第7段、53页倒数第1段 * |
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