NL2030933B1 - Method for laser deposition composite strengthening of surface of magnesium alloy - Google Patents

Method for laser deposition composite strengthening of surface of magnesium alloy Download PDF

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Publication number
NL2030933B1
NL2030933B1 NL2030933A NL2030933A NL2030933B1 NL 2030933 B1 NL2030933 B1 NL 2030933B1 NL 2030933 A NL2030933 A NL 2030933A NL 2030933 A NL2030933 A NL 2030933A NL 2030933 B1 NL2030933 B1 NL 2030933B1
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Netherlands
Prior art keywords
substrate
powder
sic
magnesium alloy
laser
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NL2030933A
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Dutch (nl)
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NL2030933A (en
Inventor
Cheng Ziwei
Jiao Haitao
Hu Yong
Tang Yanchuan
Yu Meng
Liu Dejia
Jiang Xiang
Zhao Mingjuan
Zhao Longzhi
Cao Ziyun
Guan Yumeng
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Univ East China Jiaotong
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Priority to NL2030933A priority Critical patent/NL2030933B1/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/02—Coating starting from inorganic powder by application of pressure only
    • C23C24/04—Impact or kinetic deposition of particles
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

U I T T R E K S E L A method for laser deposition composite strengthening of the surface of a Inagnesiunl alloy comprises the following steps: 1) pretreating the surface of a substrate, and roughening the substrate to remove oxides and, rust stains on the surface and 5 enable the substrate to be firmly bound with a coating easily; 2) cleaning the surface of the roughened substrate with an organic solvent such as acetone, and then blow—drying the surface through an air blower or naturally air—drying the surface; and 3) putting sic and 3l6L powder with certain granularity in a mixer at a 10 certain ratio to be fully mixed, and scanning and irradiating the mixed SiC—3l6L powder under protection of argon or helium through a laser device under proper technological parameters to enable the powder to enter lasers close to a focus and the substrate to be away from the focus. l5

Description

P1116/NLpd
METHOD FOR LASER DEPOSITION COMPOSITE STRENGTHENING OF SURFACE OF
MAGNESIUM ALLOY
TECHNICAL FIELD
The disclosure relates to a method for laser deposition com- posite strengthening of the surface of a magnesium alloy.
BACKGROUND ART
The magnesium alloy is lowest in density in all structural alloys, has the advantages of high specific strength and specific stiffness, good heat conductivity, good damping vibration absorp- tion performance, high anti-electromagnetic interference capacity, excellent cutting machinability, recycling, etc. compared with other alloys, and is honored as a green engineering material in the twenty-first century. At present, the magnesium alloy has been widely applied to electronic equipment, transportation means, aer- ospace, military, etc. However, exertion of potential of materials of magnesium is seriously restrained for a long time due to low chemical stability and low electrode potential of magnesium and poor abrasion resistance and corrosion resistance of the magnesium alloy. Stainless steel has good corrosion resistance, and is usu- ally used as a coating of a corrosive material, but its abrasion resistance is poor, hard ceramic particles have the characteris- tics of high strength, high hardness, high melting point, etc., a stainless steel coating can simultaneously have good corrosion re- sistance, good abrasion resistance and other excellent performance when the hard ceramic particles are added, and very broad applica- tion prospects are achieved. A laser surface strengthening tech- nology is one of main laser surface modification treatment tech- nologies of the magnesium alloy, and has the characteristics of high laser energy density, small heat affected zone, weak heat ef- fect and heat deformation, etc. By applying the laser strengthen- ing technology, the hardness, abrasion resistance, heat re- sistance, corrosion resistance, fatigue resistance, etc. of the surface of the material can be improved, so that the service life of a workpiece is prolonged. By the adoption of the ceramic rein-
forced particles and the laser strengthening composite technology, the corrosion resistance, hardness and abrasion resistance of the magnesium alloy can be improved to a larger degree.
SUMMARY
The disclosure aims at providing a method for laser deposi- tion composite strengthening of the surface of a magnesium alloy, which has the advantages of improving the corrosion resistance, hardness and abrasion resistance of the magnesium alloy.
The disclosure is achieved as follows: a method for laser deposition composite strengthening of the surface of a magnesium alloy, characterized in that the method comprises the following steps: 1) pretreating the surface of a substrate, wherein pre- treatment mainly comprises roughening the substrate to remove ox- ides and rust stains on the surface and enable the substrate to be firmly bound with a coating easily; 2) cleaning the surface of the roughened substrate with an organic solvent, and then blow-drying the surface through an air blower or naturally air-drying the sur- face; and 3) putting SiC and 316L powder with certain granularity in a mixer at a certain ratio to be fully mixed, then scanning and irradiating the mixed SiC-316L powder under protection of argon or helium through a laser device under proper technological parame- ters to enable the powder to enter lasers close to a focus and the substrate to be away from the focus, and forming a 3iC-316L compo- site coating; wherein the granularity of the SiC particles is 400- 800 meshes, the granularity of the 316L stainless steel powder is 200-500 meshes, the mass ratio of the SiC to the 316L is 1 :1 -1 : 10, the powder enters the lasers close to the focus, the substrate is away from the focus, and the defocusing amount of the substrate is 5-60 mm; argon or helium protection is used, the laser power of the laser device is 1500 W-3000 W, the scanning speed is 400 mm/min-1500 mm/min, the spot diameter is 2 mm-4 mm, and the defo- cusing amount of the substrate is 5-60 mm; and the organic solvent is acetone or alcohol.
The disclosure has the technical effects: 1, the coating pre- pared through the technology is metallurgically bound with a ma- trix firmly, and the coating is not prone to peeling; 2, the la- sers are clean energy and are free of pollution to the environ-
ment, the laser energy and the scanning speed can be precisely controlled, and the preparation process is simple, green, clean and environmentally friendly, and beneficial to achieving indus- trial production automation; and 3, the corrosion resistance of the surface of the magnesium alloy strengthened through the tech- nology is improved, its hardness is improved by 2 times, and its abrasion resistance is doubled.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a structure morphology diagram of a laser deposi- tion composite coating of an example 1 of the disclosure.
FIG. 2 is a structure morphology diagram of a laser deposi- tion composite coating of an example 2 of the disclosure.
FIG. 3 is a structure morphology diagram of a laser deposi- tion composite coating of an example 3 of the disclosure.
FIG. 4 is an XRD analysis map of a coating of an example 1 of the disclosure.
FIG. 5 is a hardness linear diagram of composite coatings prepared by an example 1, an example 2, an example 3 and an exam- ple 4 of the disclosure.
FIG. 6 is a relative abrasion resistance linear diagram of composite coatings prepared by an example 1, an example 2, an ex- ample 3 and an example 4 of the disclosure.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The disclosure is further illustrated with reference to em- bodiments and accompanying drawings below.
Embodiment 1
Firstly, the surface of a substrate AZ31 magnesium alloy is subjected to sand blasting through a sand blasting machine to re- move rust layers and oxides on the surface to obtain the surface with high surface roughness; the roughened AZ31 magnesium alloy is cleaned with an acetone solution till no oil dirt, etc. exists on the surface; then the surface is naturally air-dried for use; SiC powder of 600 meshes and 316L stainless steel powder of 300 meshes are mixed in a mixer at a ratio of 1 : 9 to be mixed for 3 h, the
Sic powder and the 316L stainless steel powder are fully mixed uniformly to be prepared into 5iC-316L composite powder, the AZ31 magnesium alloy is put on a workbench of a laser device, and the powder and the substrate are irradiated through lasers, wherein the technological parameters of the lasers are as follows: the la- ser power is 2200 W, the scanning speed is 1200 mm/min, the spot diameter is 2 mm, and the defocusing amount of the substrate is 5 mm; and a SiC-316L composite coating is formed, wherein its struc- ture morphology and relevant parameters are seen in FIG. 1, FIG. 4, FIG. 5 and FIG .6.
Embodiment 2
Firstly, the surface of a substrate AZ31 magnesium alloy is subjected to sand blasting through a sand blasting machine to re- move rust layers and oxides on the surface to obtain the surface with high surface roughness; the roughened AZ31 magnesium alloy is cleaned with an acetone solution till no oil dirt, etc. exists on the surface; and then the surface is naturally air-dried for use.
SiC powder of 600 meshes and 316L stainless steel powder of 300 meshes are mixed in a mixer at a ratio of 1 : 9 to be mixed for 3 h, and the SiC powder and the 316L stainless steel powder are ful- ly mixed uniformly to be prepared into SiC-316L composite powder.
The AZ31 magnesium alloy is put on a workbench of a laser device, and the powder and the substrate are irradiated through lasers, wherein the technological parameters of the lasers are as follows: the laser power is 1900 W, the scanning speed is 1200 mm/min, the spot diameter is 2 mm, and the defocusing amount of the substrate is 5 mm.
A SiC-316L composite coating is formed, wherein its structure morphology and relevant parameters are seen in FIG. 2, FIG. 5 and
FIG. 6.
Embodiment 3
Firstly, the surface of a substrate AZ31 magnesium alloy is subjected to sand blasting through a sand blasting machine to re- move rust layers and oxides on the surface to obtain the surface with high surface roughness; the roughened AZ31 magnesium alloy is cleaned with an acetone solution till no oil dirt, etc. exists on the surface; and then the surface is naturally air-dried for use.
SiC powder of 600 meshes and 316L stainless steel powder of 300 meshes are mixed in a mixer at a ratio of 1 : ¢ to be mixed for 3 h, and the SiC powder and the 316L stainless steel powder are ful-
ly mixed uniformly to be prepared into SiC-316L composite powder.
The AZ31 magnesium alloy is put on a workbench of a laser device, and the powder and the substrate are irradiated through lasers, wherein the technological parameters of the lasers are as follows: 5 the laser power is 2500 W, the scanning speed is 1200 mm/min, the spot diameter is 2 mm, and the defocusing amount of the substrate is 5 mm; and a SiC-316L composite coating is formed, wherein its structure morphology and relevant parameters are seen in FIG. 3,
FIG. 5 and FIG. 6.
Embodiment 4
Firstly, the surface of a substrate AZ31 magnesium alloy is subjected to sand blasting through a sand blasting machine to re- move rust layers and oxides on the surface to obtain the surface with high surface roughness; the roughened AZ31 magnesium alloy is cleaned with an acetone solution till no oil dirt, etc. exists on the surface; and then the surface is naturally air-dried for use.
SiC powder of 600 meshes and 316L stainless steel powder of 300 meshes are mixed in a mixer at a ratio of 1 : 9 to be mixed for 3 h, and the SiC powder and the 316L stainless steel powder are ful- ly mixed uniformly to be prepared into SiC-316L composite powder.
The AZ31 magnesium alloy is put on a workbench of a laser device, and the powder and the substrate are irradiated through lasers, wherein the technological parameters of the lasers are as follows: the laser power is 2800 W, the scanning speed is 1200 mm/min, the spot diameter is 2 mm, and the defocusing amount of the substrate is 5 mm; and a SiC-316L composite coating is formed, wherein its structure morphology and relevant parameters are seen in FIG. 5 and FIG. 6.
Based on the above, FIG. 1, FIG. 2 and FIG. 3 are micro- structures of composite coatings prepared by an example 1, an ex- ample 2 and an example 3 respectively, and it can be seen from the figures that the coatings are smooth in surface and free of macro- crack and air hole defects, coating grains are uniform and fine, and excellent coating features are compounded.
FIG. 4 is an XRD component diagram of the composite coating prepared by the example 1, and mainly raw phases Mg, Fe, Sic, etc., and oxides MgO and SiO; without reactions exist in the coat-
ing. Rapid melting and rapid set are main features of laser melt injection, the 316L stainless steel powder and the SiC powder in the coating rapidly pass through a laser zone, the autoreaction probability of the melt injection powder is small, and Mg in a magnesium alloy matrix diffuses above a molten pool due to convec- tion generated by laser irradiation to be mixed with the coating powder. Thus, more Mg, Fe and SiC phases exist in the coating.
FIG. 5 is a hardness curve diagram of the composite coatings obtained by the example 1, the example 2, the example 3 and the example 4, and it can be seen from the figures that the hardness of the prepared coatings is greatly improved, and the hardness maximum value of the coatings reaches 150 HV, and is about 4 times that of a substrate material.
FIG. 6 is a relative abrasion resistance curve diagram of the composite coatings obtained by the example 1, the example 2, the example 3 and the example 4, and it can be seen from the figures that the relative abrasion resistance of the prepared coatings is correspondingly improved, and the maximum hardness is about 2 times that of the substrate material.
In conclusion, in the magnesium alloy strengthened through the method, the stainless steel powder and the ceramic phase par- ticles are added on the basis of common laser surface strengthen- ing, and meanwhile the corrosion resistance, hardness and abrasion resistance of the surface of the material are improved. The tech- nological production process is simple, green, clean and environ- mentally friendly, and beneficial to achieving industrial produc- tion automation, and the prepared alloy is excellent in perfor- mance and long in service life, and has good economic prospects.

Claims (4)

CONCLUSIESCONCLUSIONS 1. Werkwijze voor het met afzetting van een laserdepositie compo- siet versterken van het oppervlak van een magnesiumlegering, met het kenmerk, dat de werkwijze de volgende stappen omvat: 1) het voorbehandelen van het oppervlak van een substraat, waarbij de voorbehandeling hoofdzakelijk omvat het opruwen van het substraat om oxiden en roestvlekken op het oppervlak te verwijderen en het substraat gemakkelijk met een coating vast te kunnen binden; 2) het oppervlak van het opgeruwde substraat reinigen met een orga- nisch oplosmiddel en vervolgens het oppervlak met een luchtblazer droog blazen of het oppervlak natuurlijk aan de lucht laten dro- gen; en 3) SiC- en 316L-poeder met een bepaalde granulariteit in een menger in een bepaalde verhouding doen om volledig te worden gemengd, het gemengde SiC-316L-poeder te scannen en te bestralen onder bescherming van argon of helium via een laserapparaat onder de juiste technologische parameters om het poeder de lasers binnen te laten gaan dichtbij een brandpunt van de lasers terwijl het substraat op afstand van het brandpunt blijft, en het vormen van een SiC-316L composietcoating.A method for strengthening the surface of a magnesium alloy with a laser deposition composite, characterized in that the method comprises the following steps: 1) pre-treating the surface of a substrate, the pre-treatment mainly comprising roughening of the substrate to remove oxides and rust stains on the surface and to easily bond the substrate with a coating; 2) cleaning the surface of the roughened substrate with an organic solvent and then blowing the surface dry with an air blower or allowing the surface to air dry naturally; and 3) put SiC and 316L powder with a certain granularity into a mixer in a certain ratio to be completely mixed, scan and irradiate the mixed SiC-316L powder under the protection of argon or helium through a laser device under the proper technological parameters to allow the powder to enter the lasers close to a focal point of the lasers while keeping the substrate away from the focal point, and forming a SiC-316L composite coating. 2. Werkwijze voor het met afzetting van een laserdepositie compo- siet versterken van het oppervlak van een magnesiumlegering vol- gens conclusie 1, met het kenmerk, dat de korreligheid van de SiC- deeltjes 400 tot 800 mesh is, de granulariteit van het 316L roest- vrij staalpoeder 200 tot 500 mesh is, de massaverhouding van de SiC tot de 316L is 1: 1 tot 1: 10, het poeder de lasers dicht bij de focus binnenkomt , het substraat op afstand is gelegen van de focus en de hoeveelheid defocussering van het substraat 5 tot 60 mm is.The method for strengthening the surface of a magnesium alloy by laser deposition composite according to claim 1, characterized in that the granularity of the SiC particles is 400 to 800 mesh, the granularity of the 316L rust - free steel powder is 200 to 500 mesh, the mass ratio of the SiC to the 316L is 1:1 to 1:10, the powder enters the lasers close to the focus, the substrate is remote from the focus, and the amount of defocusing of the substrate is 5 to 60 mm. 3. Werkwijze voor het met afzetting van een laserdepositie compo- siet versterken van het oppervlak van een magnesiumlegering vol- gens conclusie 1, met het kenmerk, dat argon- of heliumbescherming wordt gebruikt, het laservermogen van het laserapparaat 1500 W tot 3000 W is, de scansnelheid 400 mm/ min tot 1500 mm/min, de vlek-A method of strengthening the surface of a magnesium alloy with a laser deposition composite according to claim 1, characterized in that argon or helium protection is used, the laser power of the laser device is 1500 W to 3000 W, the scanning speed 400mm/min to 1500mm/min, the spot- diameter is 2 mm tot 4 mm en de mate van onscherpte van het sub- straat is 5 tot 60 mm.diameter is 2 mm to 4 mm and the degree of defocus of the substrate is 5 to 60 mm. 4. Werkwijze voor het met afzetting van een laserdepositie compo- siet versterken van het oppervlak van een magnesiumlegering vol- gens conclusie 1, met het kenmerk, dat het organische oplosmiddel aceton of alcohol is.The method of strengthening the surface of a magnesium alloy by laser deposition composite according to claim 1, characterized in that the organic solvent is acetone or alcohol.
NL2030933A 2022-02-14 2022-02-14 Method for laser deposition composite strengthening of surface of magnesium alloy NL2030933B1 (en)

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