CN103451656A - Chemical milling method of K423A cast superalloy without intergranular corrosion - Google Patents

Chemical milling method of K423A cast superalloy without intergranular corrosion Download PDF

Info

Publication number
CN103451656A
CN103451656A CN2013103876060A CN201310387606A CN103451656A CN 103451656 A CN103451656 A CN 103451656A CN 2013103876060 A CN2013103876060 A CN 2013103876060A CN 201310387606 A CN201310387606 A CN 201310387606A CN 103451656 A CN103451656 A CN 103451656A
Authority
CN
China
Prior art keywords
chemical milling
milling
intergranular corrosion
alloy
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2013103876060A
Other languages
Chinese (zh)
Inventor
赵晴
陈四兵
杜楠
林翠
刘刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanchang Hangkong University
Original Assignee
Nanchang Hangkong University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanchang Hangkong University filed Critical Nanchang Hangkong University
Priority to CN2013103876060A priority Critical patent/CN103451656A/en
Publication of CN103451656A publication Critical patent/CN103451656A/en
Pending legal-status Critical Current

Links

Landscapes

  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The invention provides a chemical milling method of K423A cast superalloy without intergranular corrosion. The chemical milling method is characterized in that a composite addition agent is added to a chemical milling working fluid, so that after being subjected to chemical milling machining, the K423A alloy has a smooth and sound surface without intergranular corrosion. The chemical milling method comprises the following steps of (1) removing oil by using ultrasonic waves; (2) activating; (3) carrying out chemical milling machining; and (4) carrying out aftertreatment. The chemical milling method has the advantage that after the K423A alloy is subjected to chemical milling machining, the metal surface with small surface roughness, good surface evenness and accurate size and without allowance and intergranular corrosion can be obtained.

Description

A kind of K423A cast superalloy is without the chemistry milling method of intergranular corrosion
Technical field
The present invention relates to a kind of chemistry milling method, relate in particular to the chemistry milling method of a kind of K423A cast superalloy without intergranular corrosion.
Background technology
The K423A superalloy is the nickel-base cast superalloy that China develops voluntarily, there are the characteristics such as intensity is high and anti-oxidant, anti-fatigue performance is good, tissue is stable, is applicable to be produced on hollow (or solid) turning vane of gas turbine or the block cast guider that use below 1000 ℃.Adopt milling processing can remove the unnecessary material of turning vane or block cast guider specific region, remove to greatest extent part useless heavy, alleviate the oeverall quality of aircraft and guarantee the precision of accessory size, expose and eliminate the mo(u)lded piece cosmetic bug.Yet, the K423A alloy in strong acidic environment during milling Susceptibility To Intergranular Corrosion very high, there will be intergranular corrosion in conventional nickel base superalloy milling corrosive fluid carries out the process of milling processing, had a strong impact on high temperature tensile strength, creep strength and the creep rupture strength of K423A alloy.
Add combined additive and eliminate K423A superalloy milling processing intergranular corrosion in the milling corrosive fluid, make corrosion more even.The present invention utilizes combined additive to make crystal boundary suitable with the crystal grain dissolution rate, thereby eliminates intergranular corrosion, obtains the metallic surface that surfaceness is little, surface finish good, occur without intergranular corrosion.The K423A superalloy has well overcome the technical barrier of precision casting and mechanical workout without intergranular corrosion milling processing as a kind of special working method.
Summary of the invention
The object of the present invention is to provide the chemistry milling method of a kind of K423A cast superalloy without intergranular corrosion, adopt the method can access that surfaceness is little, surface finish good, size is accurate, without surplus, without the metallic surface of intergranular corrosion.
The present invention is achieved in that its method steps is:
(1) ultrasonic wave oil removing: Sodium dodecylbenzene sulfonate 8～10 g/L, sodium lauryl sulphate 2～4g/L, alcohol 40ml/L are mixed with degreasing fluid, temperature 50 C, vibration of ultrasonic wave power: 1.2kw, each 10min of vibration of ultrasonic wave time, this degreasing fluid is removed to the test piece surface and oil contaminant, till eliminating.After oil removing, test piece is thoroughly cleaned through water, then carries out surperficial moisture film continuity check, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.By after 9.7mol/L hydrochloric acid and the mixing of 16.8mol/L hydrofluoric acid, room temperature, erosion time 120～150 s, carry out milling processing immediately after activation;
(3) milling processing: 40% hydrofluoric acid 250～350ml/L, Fe(NO3)39H2O 200～250g/L, 85% phosphoric acid 200～300ml/L, straight alkylbenzene sulfonate 1～3 g/L, thiocyanate-1～3 g/L are mixed with the milling working fluid, 60 ± 2 ℃ of temperature, stirring velocity 160～200r/min, then by K423A alloy vertical hanging in this milling working fluid.
(4) aftertreatment: after milling processing, sample moves to immediately in hot water and soaks 3～5min, and cold water flush 2 times, dry up.
Advantage of the present invention is: can access surfaceness by milling processing after adding combined additive at chemical milling solution little, surface finish is good, and size is accurate, without surplus, and the K423A alloy surface particularly occurred without intergranular corrosion.Intergranular corrosion detects to be carried out with reference to the requirement of ASTM G28 A standard code.Observe under 350 times, KH-7700 3 D video microscope on crystal boundary and separate out mutually without harmful according to the K423A alloy after milling of the present invention, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact.
Embodiment
Embodiment mono-: (1) ultrasonic wave oil removing: the ultrasonic wave of removing the test piece surface and oil contaminant is removed oil formula:
Sodium dodecylbenzene sulfonate (C 18h 29naO 3s) 8 g/L
Sodium lauryl sulphate (C 12h 25sO 4na) 2g/L
Alcohol (C 2h 5oH) 40ml/L
Temperature 50 C
Vibration of ultrasonic wave power: 1.2kw
Till the vibration of ultrasonic wave time eliminates
The part oil removing is thoroughly cleaned by water, then carries out the continuity check of piece surface moisture film, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.The parameter of activating process is, hydrochloric acid 9.7mol/L, and hydrofluoric acid 16.8mol/L, room temperature, erosion time 135s, carry out milling processing immediately after activation;
(3) milling processing: the parameter of milling complete processing is, 60 ± 2 ℃ of 40% hydrofluoric acid 250ml/L, Fe(NO3)39H2O 200g/L, 85% phosphoric acid 200ml/L, straight alkylbenzene sulfonate 1 g/L, thiocyanate-1 g/L temperature, stirring velocity 160～200r/min, then overturn K423A alloy vertical hanging 100 min(in this milling working fluid once in every 20 minutes).
(4) aftertreatment: after milling processing, sample is transferred to hot-water soak 3～5min immediately, and cold water flush 2 times, dry up, and guarantees that alloy surface is residual without the milling working fluid, affects the alloy surface quality.
Adopting the JB-6C surface coarseness profiling instrument to record the alloy sample surface roughness Ra is 1.3 μ m, the 35DL ultrasonic thickness indicator records the chemistry milling degree of depth 313 μ m, milling speed 3.13 μ m/min, observe on crystal boundary and separate out mutually without harmful under 350 times, KH-7700 3 D video microscope with reference to the requirement of ASTM G28 A method standard code, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact, meets processing request.
Embodiment bis-: (1) ultrasonic wave oil removing: the ultrasonic wave of removing the test piece surface and oil contaminant is removed oil formula:
Sodium dodecylbenzene sulfonate (C 18h 29naO 3s) 10 g/L
Sodium lauryl sulphate (C 12h 25sO 4na) 4g/L
Alcohol (C 2h 5oH) 40ml/L
Temperature 50 C
Vibration of ultrasonic wave power: 1.2kw
Till the vibration of ultrasonic wave time eliminates
The part oil removing is thoroughly cleaned by water, then carries out the continuity check of piece surface moisture film, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.The parameter of activating process is, hydrochloric acid 9.7mol/L, and hydrofluoric acid 16.8mol/L, room temperature, erosion time 135s, carry out milling processing immediately after activation;
(3) milling processing: the parameter of milling complete processing is, 40% hydrofluoric acid 350ml/L, Fe(NO3)39H2O 250g/L, 85% phosphoric acid 300ml/L, straight alkylbenzene sulfonate 3 g/L, thiocyanate-3 g/L, 60 ± 2 ℃ of temperature, stirring velocity 160～200r/min, then overturn K423A alloy vertical hanging 100 min(in this milling working fluid once in every 20 minutes).
(4) aftertreatment: after milling processing, sample is transferred to hot-water soak 3～5min immediately, and cold water flush 2 times, dry up, and guarantees that alloy surface is residual without the milling working fluid, affects the alloy surface quality.
Adopting the JB-6C surface coarseness profiling instrument to record the alloy sample surface roughness Ra is 1.048 μ m, the 35DL ultrasonic thickness indicator records the chemistry milling degree of depth 280 μ m, milling speed 2.80 μ m/min, observe on crystal boundary and separate out mutually without harmful under 350 times, KH-7700 3 D video microscope with reference to the requirement of ASTM G28 A method standard code, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact, meets processing request.
Embodiment tri-:
(1) ultrasonic wave oil removing: the ultrasonic wave of removing the test piece surface and oil contaminant is removed oil formula:
Sodium dodecylbenzene sulfonate (C 18h 29naO 3s) 9 g/L
Sodium lauryl sulphate (C 12h 25sO 4na) 3g/L
Alcohol (C 2h 5oH) 40ml/L
Temperature 50 C
Vibration of ultrasonic wave power: 1.2kw
Till the vibration of ultrasonic wave time eliminates
The part oil removing is thoroughly cleaned by water, then carries out the continuity check of piece surface moisture film, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.The parameter of activating process is, hydrochloric acid 9.7mol/L, and hydrofluoric acid 16.8mol/L, room temperature, erosion time 135s, carry out milling processing immediately after activation;
(3) milling processing: the parameter of milling complete processing is, 40% hydrofluoric acid 300ml/L, Fe(NO3)39H2O 210g/L, 85% phosphoric acid 230ml/L, straight alkylbenzene sulfonate 2 g/L, thiocyanate-2 g/L, 60 ± 2 ℃ of temperature, stirring velocity 160～200r/min, then overturn K423A alloy vertical hanging 100 min(in this milling working fluid once in every 20 minutes).
(4) aftertreatment: after milling processing, sample is transferred to hot-water soak 3～5min immediately, and cold water flush 2 times, dry up, and guarantees that alloy surface is residual without the milling working fluid, affects the alloy surface quality.
Adopting the JB-6C surface coarseness profiling instrument to record the alloy sample surface roughness Ra is 1.397 μ m, the 35DL ultrasonic thickness indicator records the chemistry milling degree of depth 346 μ m, milling speed 3.46 μ m/min, surface finish is 20 μ m, observe on crystal boundary and separate out mutually without harmful under 350 times, KH-7700 3 D video microscope with reference to the requirement of ASTM G28 A method standard code, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact, meets processing request.
Embodiment tetra-:
(1) ultrasonic wave oil removing: the ultrasonic wave of removing the test piece surface and oil contaminant is removed oil formula:
Sodium dodecylbenzene sulfonate (C 18h 29naO 3s) 8 g/L
Sodium lauryl sulphate (C 12h 25sO 4na) 4g/L
Alcohol (C 2h 5oH) 40ml/L
Temperature 50 C
Vibration of ultrasonic wave power: 1.2kw
Till the vibration of ultrasonic wave time eliminates
The part oil removing is thoroughly cleaned by water, then carries out the continuity check of piece surface moisture film, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.The parameter of activating process is, hydrochloric acid 9.7mol/L, and hydrofluoric acid 16.8mol/L, room temperature, erosion time 120s, carry out milling processing immediately after activation;
(3) milling processing: the parameter of milling complete processing is, 40% hydrofluoric acid 310ml/L, Fe(NO3)39H2O 220g/L, 85% phosphoric acid 260ml/L, straight alkylbenzene sulfonate 2 g/L, thiocyanate-2 g/L, 60 ± 2 ℃ of temperature, stirring velocity 160～200r/min, then overturn K423A alloy vertical hanging 100 min(in this milling working fluid once in every 20 minutes).
(4) aftertreatment: after milling processing, sample is transferred to hot-water soak 3～5min immediately, and cold water flush 2 times, dry up, and guarantees that alloy surface is residual without the milling working fluid, affects the alloy surface quality.
Adopting the JB-6C surface coarseness profiling instrument to record the alloy sample surface roughness Ra is 1.212 μ m, the 35DL ultrasonic thickness indicator records the chemistry milling degree of depth 243 μ m, milling speed 2.43 μ m/min, observe on crystal boundary and separate out mutually without harmful under 350 times, KH-7700 3 D video microscope with reference to the requirement of ASTM G28 A method standard code, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact, meets processing request.
Embodiment five:
(1) ultrasonic wave oil removing: the ultrasonic wave of removing the test piece surface and oil contaminant is removed oil formula:
Sodium dodecylbenzene sulfonate (C 18h 29naO 3s) 10 g/L
Sodium lauryl sulphate (C 12h 25sO 4na) 2g/L
Alcohol (C 2h 5oH) 40ml/L
Temperature 50 C
Vibration of ultrasonic wave power: 1.2kw
Till the vibration of ultrasonic wave time eliminates
The part oil removing is thoroughly cleaned by water, then carries out the continuity check of piece surface moisture film, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.The parameter of activating process is, hydrochloric acid 9.7mol/L, and hydrofluoric acid 16.8mol/L, room temperature, erosion time 150s, carry out milling processing immediately after activation;
(3) milling processing: the parameter of milling complete processing is, 40% hydrofluoric acid 300ml/L, Fe(NO3)39H2O 240g/L, 85% phosphoric acid 280ml/L, straight alkylbenzene sulfonate 2 g/L, thiocyanate-2 g/L, then overturn K423A alloy vertical hanging 100 min(in this milling working fluid once in every 20 minutes).
(4) aftertreatment: after milling processing, sample is transferred to hot-water soak 3～5min immediately, and cold water flush 2 times, dry up, and guarantees that alloy surface is residual without the milling working fluid, affects the alloy surface quality.
Adopting the JB-6C surface coarseness profiling instrument to record the alloy sample surface roughness Ra is 1.170 μ m, the 35DL ultrasonic thickness indicator records the chemistry milling degree of depth 440 μ m, milling speed 4.40 μ m/min, observe on crystal boundary and separate out mutually without harmful under 350 times, KH-7700 3 D video microscope with reference to the requirement of ASTM G28 A method standard code, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact, meets processing request.

Claims (1)

1. 一种K423A铸造高温合金无晶间腐蚀的化学铣切方法，其特征是方法步骤为： 1. A chemical milling method for K423A cast superalloy without intergranular corrosion, characterized in that the method steps are: （1）超声波除油：十二烷基苯磺酸钠8～10 g/L、十二烷基硫酸钠2～4g/L、酒精40ml/L配制成除油液，温度50℃，超声波震动功率：1.2kw，超声波震动时间每次10min，将该除油液除去试片表面油污，除油后试片经水清洗，再进行表面水膜连续性检查，直至整个零件表面亲水，无水珠和不浸润处； (1) Ultrasonic degreasing: Sodium dodecylbenzenesulfonate 8-10 g/L, sodium dodecyl sulfate 2-4g/L, alcohol 40ml/L are prepared as a degreasing liquid, the temperature is 50°C, ultrasonic vibration Power: 1.2kw, ultrasonic vibration time 10min each time, remove the oil on the surface of the test piece with the degreasing solution, wash the test piece with water after degreasing, and then check the continuity of the surface water film until the surface of the entire part is hydrophilic and anhydrous Beads and non-wetting areas; （2）活化：除去K423A高温合金表面形成的氧化膜，使表面处于活化状态，为化铣加工提供良好的表面，将9.7mol/L盐酸和16.8mol/L氢氟酸混合后，室温，侵蚀时间 120～150 s，活化后立即进行化铣加工；  (2) Activation: Remove the oxide film formed on the surface of the K423A superalloy, make the surface in an activated state, and provide a good surface for chemical milling. After mixing 9.7mol/L hydrochloric acid and 16.8mol/L hydrofluoric acid, room temperature, erosion The time is 120-150 s, and the chemical milling process is carried out immediately after activation; （3）化铣加工：40%氢氟酸250～350ml/L、九水合硝酸铁200～250g/L、85%磷酸200～300ml/L、直烷基苯磺酸盐1～3 g/L、硫氰酸盐1～3 g/L，配制成化铣加工液，温度60±2℃，搅拌速度160～200r/min，然后将K423A合金垂直悬挂于该化铣加工液中； (3) Chemical milling: 40% hydrofluoric acid 250-350ml/L, iron nitrate nonahydrate 200-250g/L, 85% phosphoric acid 200-300ml/L, straight alkylbenzene sulfonate 1-3 g/L , Thiocyanate 1-3 g/L, prepared into chemical milling fluid, temperature 60±2℃, stirring speed 160-200r/min, then hang K423A alloy vertically in the chemical milling fluid; （4）后处理：化铣加工后试样立即移至热水中浸泡3～5min，冷水冲洗2次，吹干。 (4) Post-treatment: Immediately after chemical milling, move the sample to hot water for 3-5 minutes, rinse with cold water twice, and blow dry.
CN2013103876060A 2013-08-31 2013-08-31 Chemical milling method of K423A cast superalloy without intergranular corrosion Pending CN103451656A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013103876060A CN103451656A (en) 2013-08-31 2013-08-31 Chemical milling method of K423A cast superalloy without intergranular corrosion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2013103876060A CN103451656A (en) 2013-08-31 2013-08-31 Chemical milling method of K423A cast superalloy without intergranular corrosion

Publications (1)

Publication Number Publication Date
CN103451656A true CN103451656A (en) 2013-12-18

Family

ID=49734476

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2013103876060A Pending CN103451656A (en) 2013-08-31 2013-08-31 Chemical milling method of K423A cast superalloy without intergranular corrosion

Country Status (1)

Country Link
CN (1) CN103451656A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104746077A (en) * 2015-03-12 2015-07-01 南昌航空大学 A precision chemical milling method for Ti2AlNb alloy
CN107641807A (en) * 2017-09-25 2018-01-30 南昌航空大学 A kind of method of suitable nickel-base casting alloy chemical attack processing
CN108385108A (en) * 2018-04-19 2018-08-10 东北大学 A kind of single crystal super alloy precision castings milling cream and its preparation method and application

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101696501A (en) * 2009-10-29 2010-04-21 西安航空动力股份有限公司 Precision-forging chemical-milling solution for high-temperature alloy blades and chemical milling method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101696501A (en) * 2009-10-29 2010-04-21 西安航空动力股份有限公司 Precision-forging chemical-milling solution for high-temperature alloy blades and chemical milling method

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
付明等: "化学铣切工艺在15-5PH精密机械零件加工中的研究与应用", 《航空兵器》 *
李怀章: "用于磷酸和硝酸的腐蚀抑制剂", 《陕西化工》 *
袁亮: "GH4169高温合金腐蚀加工及其对基体性能影响研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104746077A (en) * 2015-03-12 2015-07-01 南昌航空大学 A precision chemical milling method for Ti2AlNb alloy
CN107641807A (en) * 2017-09-25 2018-01-30 南昌航空大学 A kind of method of suitable nickel-base casting alloy chemical attack processing
CN108385108A (en) * 2018-04-19 2018-08-10 东北大学 A kind of single crystal super alloy precision castings milling cream and its preparation method and application
CN108385108B (en) * 2018-04-19 2019-06-11 东北大学 A kind of single crystal superalloy precision casting milling paste and its preparation method and application

Similar Documents

Publication Publication Date Title
CN105372246B (en) For detecting the corrosive agent and its application method of austenitic stainless steel shot blasting on surface layer
CN104911577B (en) A kind of aluminium alloy non-chromium alkaline passivation liquid and aluminium alloy passivating method
CN103422092B (en) A kind of polishing fluid and finishing method thereof
CN103757633B (en) A kind of magnesium alloy nickel strip method
CN103451656A (en) Chemical milling method of K423A cast superalloy without intergranular corrosion
CN102847668B (en) Preparation method for super hydrophobic protective film on surface of high strength aluminum alloy
TW201443282A (en) Method for conversion treating surface of magnesium alloy workpiece
CN103805999A (en) Type 18-8 chromium-nickel austenite stainless steel metallographic phase etching liquid for power station boiler and etching method
CN104213132A (en) Chemical cleaning method of rust-proof aluminum alloy
CN103014710A (en) Metallographic corrosive agent for invar welded joint welded by using M93 welding wires and preparation method for metallographic corrosive agent
CN105063621B (en) A kind of magnesium alloy metallographic etching agent
CN102758198A (en) Super-molecular membranization surface treatment method
CN104451731A (en) Chemical pickling solution for removing surface oxide layer of high-temperature alloys containing elements Cr and Al and application of chemical pickling solution
CN104549036A (en) Foaming agent for sealing member pressure testing
CN104746077A (en) A precision chemical milling method for Ti2AlNb alloy
CN108754473A (en) A kind of magnesium alloy surface chromium-free passivator and its application
CN103913393B (en) The quick projectional technique of a kind of Marine Engineering Steel stress corrosion crack time
CN102936732B (en) Aluminum alloy die-cast surface cleaning agent and preparation method thereof
CN104359431A (en) Method for in-situ observation of three-dimensional shape of silicon phase in aluminum-silicon alloy
CN108760439B (en) Metallographic phase sample preparation method for CrMo steel
JP2012241215A (en) Liquid for forming fine structure film on metal surface
CN101864576A (en) Magnesium alloy surface treatment cleaning solution and treatment method
CN105442006A (en) Preparation method for micro-capsule-coated rare earth element self-repairing conversion coating on surface of magnesium-aluminum alloy
CN109385633A (en) The metallographic etchant and its caustic solution of one Albatra metal
CN104611692A (en) Filming solution of magnesium alloy black conversion film and preparation method of conversion film

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20131218