CN107641807A - A kind of method of suitable nickel-base casting alloy chemical attack processing - Google Patents
A kind of method of suitable nickel-base casting alloy chemical attack processing Download PDFInfo
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Abstract
A kind of method of suitable nickel-base casting alloy chemical attack processing, the compound additive for being led to X 100, paregal O, Dispersant MF and saccharin sodium composition using sodium n-alkylbenzenesulfonate, sodium sulfocyanate, Qula is used in nickel-base casting alloy chemical attack processing, and its method and step is：The greasy dirt of alloy surface is removed using the water base degreasing fluid of CLN711 film Special cleanings protective agent, neopelex, lauryl sodium sulfate composition；The Acidwash solution being made up of hydrochloric acid, hydrofluoric acid, phosphoric acid removes the oxidation film layer of alloy surface；The chemical attack working fluid corrosion treatment nickel-base casting alloy being made up of compound additive and hydrofluoric acid, nitric acid, ferric trichloride, phosphoric acid；Washing and drying process alloy.The present invention can obtain surfacing light, the finished surface that roughness is small, intercrystalline corrosion is few after nickel-base casting alloy chemical attack processing.
Description
Technical field
The present invention relates to a kind of method of suitable nickel-base casting alloy chemical attack processing, metal material surface is particularly belonged to
Processing technology field.
Background technology
Nickel-base casting alloy has the excellent characteristics such as high temperature resistant, intensity height, excellent thermal corrosion resistance, in Aero-Space, changes
The industrial circles such as the work energy, automobile shipbuilding are widely used, such as manufacture aero-engine, industry gas turbine turbo blade and
The turbine shaft etc. of guide vane, vehicle supercharger.Nickel-base casting alloy is there is also shortcoming, as plasticity is relatively low, anti-fatigue performance
It is slightly worse, permanent at high temperature to be fluctuated using structure stability larger, processed using machine cut and be also easy to produce stress, crackle, burr
The defects of, finished surface precision is not also high.It is common recognition to there is the complex shape part of inner chamber to carry out machining difficulty, and uses
Chemical attack processing method can preferably solve this problem.
Carrying out chemical attack process systems to nickel-base casting alloy at present has several major classes：First, bisgallic acid system is such as：Hydrochloric acid sulphur
Acid system, nitric acid hydrochloric acid system, nitric hydrofluoric acid system.It is another kind of be three acid systems such as：Nitric hydrofluoric acid hydrochloric acid system, nitric acid
Hydrofluoric acid sulfuric acid system, nitric hydrofluoric acid Phosphoric Acid, also it is exactly to add strong oxidizer in bisgallic acid or three acid systems.It is Ni-based
Casting alloy is strong to Susceptibility To Intergranular Corrosion, during using these corrosion processing systems to process nickel-base casting alloy, in processing table
Easily there is the etch pit of part or large area in face, and than more serious, surface obfuscation out-of-flatness, surface roughness are big for intercrystalline corrosion,
And the processing speed fluctuation of general chemical corrosion system is larger, process is difficult control.Therefore, nickel-base casting alloy chemistry is rotten
It is critically important to lose the selection of composition, content and the technological parameter of working fluid bulk composition etc., while add using some corrosion are added
Occur intercrystalline corrosion when agent is to avoid corrosion processing and seem to be even more important.
Nickel-base casting alloy in highly acid chemical attack working fluid, chemical attack process when to Susceptibility To Intergranular Corrosion compared with
Height, easily occur intercrystalline corrosion phenomenon when chemical attack is processed, cause the creep strength of nickel-base casting alloy, creep rupture strength and
High temperature tensile strength reduces.Therefore, the chemical attack process systems of nickel-base casting alloy are chosen, are added in corrosion processing liquid
The intercrystalline corrosion that occurs when some additives can preferably eliminate chemical attack processing, makes that corrosion processing speed is steady, processing table
Face smooth, precision are higher.The species of additive, mutual collocation and content all strong influence machined surface quality,
The stability of working fluid and life-span.And the reasonable combination of multiple additives mixes into compound additive can substantially stablize chemical attack
Processing speed, machined surface quality is improved, reduce intercrystalline corrosion.
The present invention is to carry out chemical attack processing technology and formula using suitable nickel-base casting alloy, and is added in formula
Compound additive can make nickel-base casting alloy, and when chemical attack is processed, crystal boundary is suitable with crystal grain chemistry corrosion processing speed, adds
Work rate stabilization, and surfacing light, the finished surface that surface roughness is small, machining accuracy is high, intercrystalline corrosion is few can be obtained.
The present invention nickel-base casting alloy chemical attack processing technology and be also easy to produce with can effectively overcome in hot investment casting and hot-working
Stress, crackle, burr are the technical barrier for the defects such as machining accuracy is low.
The content of the invention
It is an object of the invention to provide the technique and formula that a kind of suitable nickel-base casting alloy carries out chemical attack processing,
And addition compound additive makes the method that nickel-base casting alloy reduces intercrystalline corrosion when chemical attack is processed in formula, uses
This method can obtain surfacing light, the finished surface that roughness is small, intercrystalline corrosion is few.A kind of suitable Ni-based casting of the invention
Making the method for alloy corrosion processing includes electrochemical deoiling, pickling, chemical attack and post-processing step, is specially：
Step 1：Electrochemical deoiling
The greasy dirt on nickel-base casting alloy surface is removed using degreasing fluid, makes its clean surface, oil removing temperature control is 40~50
DEG C, oil removing time control is in 4~6 min.
Degreasing fluid forms：The protectant dosage of CLN711 film Special cleanings is 25~35 mL/L, neopelex
Dosage be 1~3 g/L, the dosage of lauryl sodium sulfate be 1~3 g/L, surplus is water.
Step 2：Pickling
Room temperature immersion is carried out to nickel-base casting alloy finished surface with mixed acid solution and handles 150~200 s, to remove its surface
Oxidation film layer.
The composition of Acidwash solution：38wt% hydrochloric acid 700~800 mL, 40wt% hydrofluoric acid 50~70 mL, 85wt%'s
The mL of phosphoric acid 25~35, surplus are water.
Step 3：Chemical attack is processed
The finished surface of nickel-base casting alloy is all immersed in the min of chemical corrosion liquid centre position 100, during which temperature control
At 55~62 DEG C, the speed of stirring chemical attack working fluid is 150~250 r/min.
Chemical attack working fluid is by 40wt% hydrofluoric acid, 69.2wt% nitric acid, ferric trichloride, 85wt% phosphoric acid, compound additive
Composition.
Described compound additive is by neopelex, sodium sulfocyanate, triton x-100, paregal O, scattered
Agent MF, saccharin sodium composition.
Chemical attack working fluid Ingredient Amount：
200~300 mL/L, 69.2wt% nitric acid of 40wt% hydrofluoric acid 150~200 mL/L, the g/L of ferric trichloride 350~450,
The mL/L of 85wt% phosphatase 11s 50~250, the g/L of neopelex 2~3, the g/L of sodium sulfocyanate 0.5~2, Qula lead to X-
100 mL/L of dosage 0.1~0.3, the g/L of dosage 1~3 of paregal O, the g/L of dosage 1~3, the saccharin sodium 0.2 of Dispersant MF
~0.5 mg/L.
Step 4：Post processing
Nickel-base casting alloy after chemical attack is processed soaks 2~3 min in the hot water, and pure water rinsing after-blow is used after taking-up
It is dry, obtain the nickel-base casting alloy that surface quality is high after chemical attack is processed.
Beneficial effect of the present invention：Nickel-base casting alloy chemical attack is processed by adding compound addition in chemical attack working fluid
It after agent, can substantially reduce the roughness value of chemical attack finished surface, any surface finish is smooth, and no intercrystalline corrosion occurs.Press
According to chemical attack processing method of the present invention processing nickel-base casting alloy finished surface in KH-7700 3 D videos microscope 1200
Observed under times, find finished surface smooth, zero defect, separated out on crystal boundary without harmful phase, intercrystalline corrosion depth is 0 μm.
Brief description of the drawings
Fig. 1 is nickel-base casting alloy with the surface topography after the technique milling of embodiment 1；
Fig. 2 is nickel-base casting alloy with the surface topography after the technique milling of embodiment 4.
Embodiment
Embodiment 1
（1）Electrochemical deoiling：Remove strip greasy dirt electrochemical deoiling liquid composition and process conditions be：
The mL/L of film scavenger specially CLN711 25~35
Neopelex（C18H29NaO3S）1~3 g/L
Lauryl sodium sulfate（C12H25SO4Na ）1~3 g/L
40~50 DEG C of temperature
The min of oil removing time 4~6
Test piece carries out surface moisture film continuity check after electrochemical deoiling cleaning, test piece finished surface is disposed vertically, if 10 s
Inner surface infiltrates place without the globule and not, then it is assumed that oil removing is qualified；
（2）Pickling：Activation process is carried out to finished surface with mixed acid solution, to remove the thin oxide-film in nickel-base casting alloy surface
Layer.The composition and process conditions of Acidwash solution be：750 mL/L hydrochloric acid（d=1.179 g/cm3）, 60 mL/L hydrofluoric acid（d=
0.888 g/cm3）, 30 mL/L phosphoric acid（d=1.874 g/cm3）, the s of room temperature immersion 175, chemical attack is carried out after pickling processes
Processing；
（3）Chemical attack is processed：The composition and process conditions of chemical attack working fluid be：250 mL/L hydrofluoric acid（d=0.888
g/cm3）, 175 mL/L nitric acid（d=1.42 g/cm3）, 400 g/L ferric chloride (FeCl36H2O)s, 230 mL/L phosphoric acid（d=1.874 g/
cm3）, 2.5 g/L neopelexes, 1.25 g/L sodium sulfocyanates, 0.2 mL/L triton x-100s, 2.0 g/L it is average
O, 2.0 g/L Dispersant MFs, 0.35 mg/L saccharin sodiums is added to be configured to chemical attack working fluid, 58.5 DEG C of temperature, mixing speed
200 r/min, nickel-base casting alloy test piece is soaked in chemical attack working fluid centre position vertical hanging when chemical attack is processed
The min of stain 100.
（4）Chemical attack post-process treatment：Test piece after chemical attack is processed impregnates 2~3 min in the hot water, takes out
With pure water rinsing 3 times and dry up afterwards, it is ensured that the chemical attack working fluid of strip noresidue, in order to avoid influence finished surface matter
Amount.
Test piece machined surface roughness is measured using JB-6C surface coarseness profiling instruments（Ra）For 1.120 μm, 35DLization
Learn calibrator and measure finished surface chemical attack depth as 325 μm, 3.25 μm/min of corrosion rate, the intergranular of finished surface is rotten
Erosion detection requires with reference to as defined in ASTM G28 A methods standards, observes, finds under 400 times of KH-7700 3 D videos microscope
Finished surface smooth, zero defect, separated out without harmful phase on crystal boundary, the intercrystalline corrosion depth of measurement is 0 μm（Such as Fig. 1）, it is full
Sufficient processing request.
Embodiment 2
（1）Electrochemical deoiling：Remove strip greasy dirt electrochemical deoiling liquid composition and process conditions be：
The mL/L of film scavenger specially CLN711 25~35
Neopelex（C18H29NaO3S）1~3 g/L
Lauryl sodium sulfate（C12H25SO4Na ）1~3 g/L
40~50 DEG C of temperature
The min of oil removing time 4~6
Test piece carries out surface moisture film continuity check after electrochemical deoiling cleaning, test piece finished surface is disposed vertically, if 10 s
Inner surface infiltrates place without the globule and not, then it is assumed that oil removing is qualified；
（2）Pickling：Activation process is carried out to finished surface with mixed acid solution, to remove the thin oxide-film in nickel-base casting alloy surface
Layer.The composition and process conditions of Acidwash solution be：700 mL/L hydrochloric acid（d=1.179 g/cm3）, 50 mL/L hydrofluoric acid（d=
0.888 g/cm3）, 25 mL/L phosphoric acid（d=1.874 g/cm3）, the s of room temperature immersion 150, it is rotten that chemistry is carried out after pickling processes
Erosion processing；
（3）Chemical attack is processed：The composition and process conditions of chemical attack working fluid be：200 mL/L hydrofluoric acid（d=0.888
g/cm3）, 150mL/L nitric acid（d=1.42 g/cm3）, 350 g/L ferric chloride (FeCl36H2O)s, 180 mL/L phosphoric acid（d=1.874 g/
cm3）, 2.0 g/L neopelexes, 0.5 g/L sodium sulfocyanates, 0.1 mL/L triton x-100s, 1.0 g/L it is average
O, 1.0 g/L Dispersant MFs, 0.2 mg/L saccharin sodiums is added to be configured to chemical attack working fluid, 55 DEG C of temperature, mixing speed 150
R/min, nickel-base casting alloy test piece is impregnated 100 in chemical attack working fluid centre position vertical hanging when chemical attack is processed
min。
（4）Chemical attack post-process treatment：Test piece after chemical attack is processed impregnates 2~3 min in the hot water, takes out
With pure water rinsing 3 times and dry up afterwards, it is ensured that the chemical attack working fluid of strip noresidue, in order to avoid influence finished surface matter
Amount.
Test piece machined surface roughness is measured using JB-6C surface coarseness profiling instruments（Ra）For 1.121 μm, 35DLization
Learn calibrator and measure finished surface chemical attack depth as 312 μm, 3.12 μm/min of corrosion rate, with reference to ASTM G28 A
Require as defined in method standard, observed under 400 times of KH-7700 3 D videos microscope, find finished surface smooth, intact
Fall into, separated out on crystal boundary without harmful phase, the intercrystalline corrosion depth of measurement is 0 μm, meets processing request.
Embodiment 3
（1）Electrochemical deoiling：Remove strip greasy dirt electrochemical deoiling liquid composition and process conditions be：
The mL/L of film scavenger specially CLN711 25~35
Neopelex（C18H29NaO3S）1~3 g/L
Lauryl sodium sulfate（C12H25SO4Na ）1~3 g/L
40~50 DEG C of temperature
The min of oil removing time 4~6
Test piece carries out surface moisture film continuity check after electrochemical deoiling cleaning, test piece finished surface is disposed vertically, if 10 s
Inner surface infiltrates place without the globule and not, then it is assumed that oil removing is qualified；
（2）Pickling：Activation process is carried out to finished surface with mixed acid solution, to remove the thin oxide-film in nickel-base casting alloy surface
Layer.The composition and process conditions of Acidwash solution be：800 mL/L hydrochloric acid（d=1.179 g/cm3）, 70 mL/L hydrofluoric acid（d=
0.888 g/cm3）, 35 mL/L phosphoric acid（d=1.874 g/cm3）, the s of room temperature immersion 200, chemical attack is carried out after pickling processes
Processing；
（3）Chemical attack is processed：The composition and process conditions of chemical attack working fluid be：300 mL/L hydrofluoric acid（d=0.888
g/cm3）, 200 mL/L nitric acid（d=1.42 g/cm3）, 450 g/L ferric chloride (FeCl36H2O)s, 280 mL/L phosphoric acid（d=1.874 g/
cm3）, 3.0 g/L neopelexes, 2.0 g/L sodium sulfocyanates, 0.3 mL/L triton x-100s, 3.0 g/L it is average
O, 3.0 g/L Dispersant MFs, 0.5 mg/L saccharin sodiums is added to be configured to chemical attack working fluid, 62 DEG C of temperature, mixing speed 250
R/min, nickel-base casting alloy test piece is soaked in chemical attack working fluid centre position vertical hanging when chemical attack processing is processed
The min of stain 100.
（4）Chemical attack post-process treatment：Test piece after chemical attack is processed impregnates 2~3 min in the hot water, takes out
With pure water rinsing 3 times and dry up afterwards, it is ensured that the chemical attack working fluid of strip noresidue, in order to avoid influence finished surface matter
Amount.
Test piece machined surface roughness is measured using JB-6C surface coarseness profiling instruments（Ra）For 1.090 μm, 35DLization
Learn calibrator and measure finished surface chemical attack depth as 343 μm, 3.43 μm/min of corrosion rate, with reference to ASTM G28 A
Require as defined in method standard, observed under 400 times of KH-7700 3 D videos microscope, find finished surface smooth, intact
Fall into, separated out on crystal boundary without harmful phase, the intercrystalline corrosion depth of measurement is 0 μm, meets processing request.
Embodiment 4
（1）Electrochemical deoiling：Remove strip greasy dirt electrochemical deoiling liquid composition and process conditions be：
The mL/L of film scavenger specially CLN711 25~35
Neopelex（C18H29NaO3S）1~3 g/L
Lauryl sodium sulfate（C12H25SO4Na ）1~3 g/L
40~50 DEG C of temperature
The min of oil removing time 4~6
Test piece carries out surface moisture film continuity check after electrochemical deoiling cleaning, test piece finished surface is disposed vertically, if 10 s
Inner surface infiltrates place without the globule and not, then it is assumed that oil removing is qualified；
（2）Pickling：Activation process is carried out to finished surface with mixed acid solution, to remove the thin oxide-film in nickel-base casting alloy surface
Layer.The composition and process conditions of Acidwash solution be：800 mL/L hydrochloric acid（d=1.179 g/cm3）, 70 mL/L hydrofluoric acid（d=
0.888 g/cm3）, 35 mL/L phosphoric acid（d=1.874 g/cm3）, the s of room temperature immersion 200, chemical attack is carried out after pickling processes
Processing；
（3）Chemical attack is processed：The composition and process conditions of chemical attack working fluid be：300 mL/L hydrofluoric acid（d=0.888
g/cm3）, 200 mL/L nitric acid（d=1.42 g/cm3）, 450 g/L ferric chloride (FeCl36H2O)s, 280 mL/L phosphoric acid（d=1.874 g/
cm3）, 3.0 g/L neopelexes, 2.0 g/L sodium sulfocyanates be configured to chemical attack working fluid, 62 DEG C of temperature, stir
The r/min of speed 250 is mixed, by nickel-base casting alloy test piece in chemical attack working fluid centre position when chemical attack processing is processed
Vertical hanging impregnates 100 min.
（4）Chemical attack post-process treatment：Test piece after chemical attack is processed impregnates 2~3 min in the hot water, takes out
With pure water rinsing 3 times and dry up afterwards, it is ensured that the chemical attack working fluid of strip noresidue, in order to avoid influence finished surface matter
Amount.
Test piece machined surface roughness is measured using JB-6C surface coarseness profiling instruments（Ra）For 2.983 μm, 35DLization
Learn calibrator and measure finished surface chemical attack depth as 351 μm, 3.51 μm/min of corrosion rate, with reference to ASTM G28 A
Require as defined in method standard, observed under 400 times of KH-7700 3 D videos microscope, find finished surface obfuscation, out-of-flatness,
There is impurities phase precipitation on crystal boundary, the intercrystalline corrosion depth of measurement is 0.59 μm（Such as Fig. 2）, it is impossible to meet processing request.
Claims (1)
- A kind of 1. method of suitable nickel-base casting alloy chemical attack processing, it is characterised in that：Described method is removed including chemistry Oil, pickling, chemical attack processing and post-processing step, it is specially：Step 1：Electrochemical deoilingThe greasy dirt on nickel-base casting alloy surface is removed using degreasing fluid, makes its clean surface, oil removing temperature control is 40~50 DEG C, oil removing time control is in 4~6 min；Degreasing fluid forms：The protectant dosage of CLN711 film Special cleanings is 25~35 mL/L, the use of neopelex The dosage measured as 1~3 g/L, lauryl sodium sulfate is 1~3 g/L, and surplus is water；Step 2：PicklingRoom temperature immersion is carried out to nickel-base casting alloy finished surface with mixed acid solution and handles 150~200 s, to remove its surface Oxidation film layer；The composition of Acidwash solution：38wt% hydrochloric acid 700~800 mL/L, 40wt% hydrofluoric acid 50~70 mL/L, 85wt%'s The mL/L of phosphoric acid 25~35, surplus are water；Step 3：Chemical attack is processedThe finished surface of nickel-base casting alloy is all immersed in the min of chemical corrosion liquid centre position 100, during which temperature control At 55~62 DEG C, the speed of stirring chemical attack working fluid is 150~250 r/min；Chemical attack working fluid is by 40wt% hydrofluoric acid, 69.2wt% nitric acid, ferric trichloride, 85wt% phosphoric acid, compound additive group Into；Described compound additive by neopelex, sodium sulfocyanate, triton x-100, paregal O, Dispersant MF, Saccharin sodium forms；Chemical attack working fluid Ingredient Amount：The mL/L of 200~300 mL/L, 69.2wt% nitric acid of 40wt% hydrofluoric acid 150~200, the g/L of ferric trichloride 350~450, The mL/L of 85wt% phosphatase 11s 50~250, the g/L of neopelex 2~3, the g/L of sodium sulfocyanate 0.5~2, Qula lead to X- 100 mL/L of dosage 0.1~0.3, the g/L of dosage 1~3 of paregal O, the g/L of dosage 1~3, the saccharin sodium 0.2 of Dispersant MF ~0.5 mg/L；Step 4：Post processingNickel-base casting alloy after chemical attack is processed soaks 2~3 min in the hot water, and pure water rinsing after-blow is used after taking-up It is dry, obtain the nickel-base casting alloy that surface quality is high after chemical attack is processed.
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