CN114525510B - Corrosive liquid, preparation method of corrosive liquid and corrosion process of Inconel625 nickel alloy - Google Patents
Corrosive liquid, preparation method of corrosive liquid and corrosion process of Inconel625 nickel alloy Download PDFInfo
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- 230000007797 corrosion Effects 0.000 title claims abstract description 59
- 238000005260 corrosion Methods 0.000 title claims abstract description 59
- 239000007788 liquid Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 41
- 229910001119 inconels 625 Inorganic materials 0.000 title claims abstract description 33
- 229910000990 Ni alloy Inorganic materials 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 38
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 23
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 19
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 19
- 238000005530 etching Methods 0.000 claims abstract description 17
- 239000004094 surface-active agent Substances 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 14
- 239000007864 aqueous solution Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 239000000243 solution Substances 0.000 claims description 34
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 11
- 230000003213 activating effect Effects 0.000 claims description 10
- 238000005238 degreasing Methods 0.000 claims description 7
- 239000012459 cleaning agent Substances 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 239000004519 grease Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 5
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- 238000005406 washing Methods 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 238000009776 industrial production Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- BIJOYKCOMBZXAE-UHFFFAOYSA-N chromium iron nickel Chemical class [Cr].[Fe].[Ni] BIJOYKCOMBZXAE-UHFFFAOYSA-N 0.000 description 1
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- 238000001035 drying Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003906 humectant Substances 0.000 description 1
- 229910000816 inconels 718 Inorganic materials 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/28—Acidic compositions for etching iron group metals
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
Abstract
The invention provides a corrosive liquid, a preparation method of the corrosive liquid and an etching process applied to an Inconel625 nickel alloy, and belongs to the technical field of etching. The corrosive liquid is characterized by comprising the following aqueous solutions of substances in concentration: 30-50ml/L of nitric acid with the mass fraction of 65-68%, 500-550ml/L of hydrochloric acid with the mass fraction of 35-36.5%, 130-160g/L of industrial anhydrous ferric chloride and 5-10ml/L of surfactant. The method has the advantages of difficult corrosion or high efficiency and controllability of corrosion of the Inconel625 nickel alloy.
Description
Technical Field
The invention belongs to the technical field of corrosion, and particularly relates to a corrosive liquid, a preparation method of the corrosive liquid and an etching process of an Inconel625 nickel alloy.
Background
The Inconel625 alloy is a nickel-chromium-iron series nickel-base corrosion-resistant heat-resistant alloy, its nickel content is above 58%, chromium content is 20-23%, and also 8-10% molybdenum content and about 3-4% niobium content, and its unique composition makes it possess high resistance to corrosive substances, and the corrosion rate of common inorganic acids such as nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid and mixed acid on said alloy is very small.
Due to the excellent corrosion resistance, the metal is widely applied to the military industry, aerospace, marine industry and the like, but due to the fact that the metal relates to the military industry, aerospace and the like, the confidentiality of related corrosion technology is high, the searched related corrosion technology information is very few, and finished corrosive liquid is not found in the market for sale.
In industrial production, certain processes require removal of certain amounts of metal layers, such as fluorescence infiltration, chemical milling, etching of marks, and the like. Existing nickel corrosion formulations such as nitric acid/hydrofluoric acid systems, nitric acid/acetic acid systems, and hydrochloric acid/nitric acid systems can corrode pure nickel or nickel alloys such as Inconel 718 by adjusting the concentration, but none of them can cause significant corrosion to Inconel 625. Taking fluorescence permeation as an example, a metal layer with the thickness of 0.05-0.1mm is generally required to be removed before permeation, and experiments prove that the conventional nitric acid/hydrofluoric acid corrosive liquid has the corrosion rate to Inconel625 below 0.002mm/s/h, takes tens of hours, and is not suitable for industrial production.
The use of concentrated sulfuric acid heated to near boiling point can cause significant corrosion to Inconel625, but the method has a first high risk, the second corrosion rate is uncontrollable, the third operability is poor, and the fourth intergranular corrosion is excessive, so that the brittleness and strength of the material are affected, and therefore, the method cannot be applied to industrial production.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides a corrosive liquid, and solves the problems that the Inconel625 nickel alloy is difficult to corrode or the efficiency is low.
The corrosive liquid is characterized by comprising the following aqueous solutions of substances in concentration: 30-50ml/L of nitric acid with the mass fraction of 65-68%, 500-550ml/L of hydrochloric acid with the mass fraction of 35-36.5%, 130-160g/L of industrial anhydrous ferric chloride and 5-10ml/L of surfactant.
The invention aims at solving the problems in the prior art, and provides a preparation method of a corrosive liquid, which has the characteristics of good effect of corroding Inconel625 nickel alloy, stable corrosiveness and environment-friendly process.
The preparation method of the corrosive liquid is characterized by comprising the following steps: nitric acid, hydrochloric acid, industrial grade anhydrous ferric chloride, and surfactant are mixed or dissolved into water.
In the above method for producing an etching solution, characterized in that,
firstly, adding pure water into a glass or plastic container;
adding industrial anhydrous ferric chloride powder;
after the ferric chloride powder is completely dissolved and cooled to room temperature, slowly adding concentrated hydrochloric acid, concentrated nitric acid and a surfactant;
adding pure water, and uniformly mixing the solutions to obtain the corrosive liquid.
In the method for producing the etching solution, the industrial grade anhydrous ferric chloride powder is added while stirring. Hair brush
The invention aims to solve the problems of uncontrollable corrosion rate, environment-friendly process, poor appearance after corrosion, and excessive inter-crystal corrosion IGA/end-crystal corrosion EGP.
An etching process of an Inconel625 nickel alloy is characterized by comprising the following steps:
s1, removing grease and dust on the surface of a workpiece;
s2, removing the surface oxide layer;
s3, immersing the workpiece in the corrosive liquid for corrosion until the preset thickness is corroded, wherein the temperature is controlled at 30-45 ℃, and the corrosion speed is 0.05-0.13mm/S/h;
s4, removing surface black ash.
In the etching process of the Inconel625 nickel alloy, the workpiece needs to be rinsed with clean water after steps S1, S2, S3 and S4 to remove surface residual substances.
In the corrosion process of Inconel625 nickel alloy, after step S1, the workpiece is rinsed with clean water and forms a water film on the surface of the workpiece after the workpiece is separated from the water surface, the water film needs to be kept for at least 30 seconds without breaking, otherwise, the previous cleaning step is repeated.
In the corrosion process of the Inconel625 nickel alloy, the workpiece in the step S4 is washed with water and then dried or blown dry.
In the etching process of the Inconel625 nickel alloy, in step S1, the workpiece is immersed in an oil removing liquid, wherein the oil removing liquid adopts a merco 4215 cleaning agent or an Ardrox 6333 cleaning agent.
In the etching process of the Inconel625 nickel alloy, in step S2, the workpiece is immersed in an activating solution to remove the surface oxide layer, wherein the activating solution is composed of an aqueous solution of the following substances in concentration: the mass fraction of the hydrochloric acid is 350-500ml/L with the concentration of 35-36.5%.
In the corrosion process of the Inconel625 nickel alloy, in the step S4, the workpiece is immersed in an ash removal liquid, wherein the ash removal liquid consists of the following solutions in volume ratio: 20-25% of nitric acid with the mass fraction of 65-68%, 3-7% of hydrofluoric acid with the mass fraction of 55% and the balance of water.
In the corrosion process of the Inconel625 nickel alloy, in the step S4, the temperature of the ash removal liquid is 55-65 ℃ and the immersion time is 2-10 minutes during ash removal.
Compared with the prior art, the invention has the following advantages:
the method can stably, efficiently and environmentally-friendly remove the required metal layer by using a chemical method, ensure the smooth appearance of the corroded metal, ensure that the intergranular corrosion (IGA) is less than 0.005 mm and the end grain corrosion (EGP) is less than 0.025 mm.
Drawings
FIG. 1 is a schematic flow chart of the corrosive liquid preparation in the invention.
FIG. 2 is a schematic flow chart of the etching process in the present invention.
FIG. 3 is an enlarged view of a portion of a workpiece after corrosion of the Inconel625 nickel alloy in accordance with the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Shown in fig. 3 is the sample end surface structure under a 500 x magnification lens after the workpiece is etched from Inconel625 nickel alloy.
An etching solution comprising an aqueous solution of: 30-50ml/L of nitric acid with the mass fraction of 65-68%, 500-550ml/L of hydrochloric acid with the mass fraction of 35-36.5%, 130-160g/L of industrial anhydrous ferric chloride and 5-10ml/L of surfactant.
Case 1: the corrosive liquid consists of aqueous solutions of the following substances: 30ml/L of nitric acid with the mass fraction of 65-68%, 500ml/L of hydrochloric acid with the mass fraction of 35-36.5%, 130g/L of industrial grade anhydrous ferric chloride and 5ml/L of surfactant.
Case 2: the corrosive liquid consists of aqueous solutions of the following substances: 40ml/L of nitric acid with the mass fraction of 65-68%, 525ml/L of hydrochloric acid with the mass fraction of 35-36.5%, 145g/L of industrial grade anhydrous ferric chloride and 7.5ml/L of surfactant.
Case 3: the corrosive liquid consists of aqueous solutions of the following substances: 50ml/L of nitric acid with the mass fraction of 65-68%, 550ml/L of hydrochloric acid with the mass fraction of 35-36.5%, 160g/L of industrial grade anhydrous ferric chloride and 10ml/L of surfactant.
Cases 1, 2 and 3 can be used for realizing corrosion on the surface of the fully immersed Inconel625 nickel alloy, and the efficiency is good.
Wherein the surfactant is SK-010 surfactant, which is sold in the market and manufactured by Kunshenkun surface treatment materials Co., ltd; or other brands of humectants.
In industrial production, the solution is generally in a range, and the acidic solution is maintained within a certain range because the solution is evaporated and taken away by parts.
As shown in fig. 1, a method for preparing an etching solution is characterized by comprising the following steps: nitric acid, hydrochloric acid, industrial grade anhydrous ferric chloride, and surfactant are mixed or dissolved into water.
In the mixing process, the solution or the solid substance is directly put into water according to the proportion until the solution is completely dissolved.
Specifically, pure water is firstly added into a glass or plastic container;
adding industrial anhydrous ferric chloride powder;
after the ferric chloride powder is completely dissolved and cooled to room temperature, slowly adding concentrated hydrochloric acid, concentrated nitric acid and a surfactant;
adding pure water, and uniformly mixing the solutions to obtain the corrosive liquid.
The preparation method can improve the safety of the solution in the configuration process.
Specifically, when the industrial grade anhydrous ferric chloride powder is added, the powder is added while stirring. Industrial grade anhydrous ferric chloride (GB/T1621-2008) powder is slowly added to water, and a large amount of heat is generated during dissolution while stirring, and it is necessary to prevent splashing. Stirring can accelerate the solution speed.
As shown in fig. 2, an etching process of Inconel625 nickel alloy includes the following steps:
s1, removing grease and dust on the surface of a workpiece;
s2, removing the surface oxide layer;
s3, immersing the workpiece in the corrosive liquid for corrosion until the preset thickness is corroded, wherein the temperature is controlled at 30-45 ℃, and the corrosion speed is 0.05-0.13mm/S/h;
s4, removing surface black ash.
The corrosion process has the characteristic of good effect of corroding the surface of the Inconel625 nickel alloy. The method can stably, efficiently and environmentally-friendly remove the required metal layer by using a chemical method, ensure the smooth appearance of the corroded metal, and ensure that IGA is less than 0.005 mm and EGP is less than 0.025 mm.
Table 1: the corrosion efficiency of the corrosive liquid under different temperature environments;
determining corrosion time according to the corrosion rate and the required metal removal amount, wherein the calculation method is that the corrosion time = single-side removal amount/corrosion rate, the corrosion rate unit mm/s/h means millimeter/single side/hour, and the corrosion time unit is hour; the unit of the single-sided removal amount is mm, namely, how much thickness of material is removed from the surface of the part; the corrosion rate is in mm/s/h, where mm is millimeter, s represents "one face of the part" and h represents hours.
In general, parts have multiple surfaces, and when corroded, the multiple surfaces are corroded simultaneously, so that the removal amount and the corrosion rate of one surface are distinguished.
The temperature of the corrosive liquid is extremely important for the whole corrosion process, the corrosion rate is not in linear relation with the temperature, and the corrosion rate is reduced to about 0.003mm/s/h when the temperature is lower than 30 ℃; when the temperature is too high, the corrosion rate is too high, and the inter-crystal corrosion IGA is easy to exceed the standard.
Specifically, after steps S1, S2, S3, S4, the workpiece needs to be rinsed with clean water to remove surface residues. Because when removing dust, surface oxide layer, corrosion process and surface black ash of the workpiece, grease, impurities and dust attached to the surface of the workpiece can be remained, so that the workpiece has better corrosion effect, and the effective cleaning can avoid the reverse groove of various chemical reagents, so that after multiple use, the components and the concentration of the chemical reagents are not opposite.
Specifically, after the workpiece is rinsed in water and is separated from the water surface, a water film is formed on the surface of the workpiece, the water film needs to be kept for at least 30 seconds without breaking, otherwise, the previous cleaning step is repeated. When the surface grease is removed, the grease can be removed cleanly, so that the part attached with the oil film is not corroded.
And (2) taking out the part washed by the workpiece in the step (S2), and not drying the water film so as to avoid regeneration of oxide scale after contacting air, and rapidly transferring and completely immersing the part in corrosive liquid.
Specifically, the workpiece in the step S4 is washed with water and then dried or blow-dried. The workpiece is convenient to store.
Specifically, in step S1, the workpiece is immersed in an oil removal liquid, and the oil removal liquid is a merco 4215 cleaning agent or an Ardrox 6333 cleaning agent. The degreasing liquid is obtained by using a commercially available degreasing agent or degreasing powder, such as Turco 4215 of Hagao company, ardrox 6333 of Kami Tel company, and the like, and the degreasing temperature and the degreasing time are required according to the product use instruction. The existence of the greasy dirt can obstruct the reaction of the subsequent solution and the metal, and the purpose of degreasing is to remove the greasy dirt, dust and other impurities.
Specifically, in the step S2, the workpiece is immersed in an activating solution to remove the surface oxide layer, the temperature of the activating solution is 50-60 ℃, the immersing time is 8-12min, and the activating solution consists of aqueous solutions of the following substances in concentration: the mass fraction of the hydrochloric acid is 350-500ml/L with the concentration of 35-36.5%.
Under the above activating solution temperature and immersion time, the oxide layer taking-out effect is good.
The preparation method of the activating solution (taking 1L preparation as an example): adding about 300ml of pure water into a clean glass or plastic container, slowly injecting 350-500ml of 35% -36.5% concentrated hydrochloric acid into the water, adding pure water to 1L, and stirring uniformly. The purpose of the activation is to remove scale that may be present on the surface of the part, exposing fresh metal substrate, and increasing the surface activity so that the subsequent etching solution is able to react sufficiently, uniformly and with the metal. This method is particularly suitable for complex parts that cannot be sandblasted.
Specifically, in the step S4, the workpiece is immersed in the ash removal liquid, the temperature of the ash removal liquid is 55-65 ℃, and the immersion time is 2-10 minutes; the ash removal liquid consists of the following solutions in volume ratio: 20-25% of nitric acid with the mass fraction of 65-68%, 3-7% of hydrofluoric acid with the mass fraction of 55% and the balance of water.
The ash removing device has better ash removing effect under the temperature and immersion time of the ash removing liquid.
The preparation method of the ash removal liquid (taking 1L preparation as an example) comprises the following steps: about 300ml of pure water is firstly added into a clean plastic container (taking care of prohibiting the use of a glass container), then 200-250ml of concentrated nitric acid with the mass fraction of 65-68% is slowly injected into the water, then 30-70ml of hydrofluoric acid (GB/T7744-2008) with the specification of 55% is added, finally pure water is added to 1L, and the mixture is stirred uniformly.
The ash removal liquid consists of the following solutions in volume ratio: 23% of nitric acid with the mass fraction of 66% by volume, 3-7% of hydrofluoric acid with the mass fraction of 55% by volume and the balance of water.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. Meanwhile, the meaning of "and/or" appearing throughout the text is to include three schemes, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme that a and B satisfy simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
All the components are general standard components or components known to the person skilled in the art, and the structures and principles of the components are known to the person skilled in the art through technical manuals or through routine experimental methods.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (9)
1. An etching process of an Inconel625 nickel alloy is characterized by comprising the following steps:
s1, removing grease and dust on the surface of a workpiece;
s2, removing the surface oxide layer;
s3, immersing the workpiece in the corrosive liquid for corrosion until the preset thickness is corroded, wherein the temperature is controlled at 30-45 ℃, and the corrosion speed is 0.05-0.13mm/S/h;
s4, removing surface black ash;
the corrosive liquid consists of aqueous solutions of the following substances: 30-50ml/L of nitric acid with the mass fraction of 65-68%, 500-550ml/L of hydrochloric acid with the mass fraction of 35-36.5%, 130-160g/L of industrial anhydrous ferric chloride and 5-10ml/L of surfactant.
2. The Inconel625 nickel alloy corrosion process according to claim 1, wherein the method for preparing the corrosion solution comprises the steps of: nitric acid, hydrochloric acid, industrial grade anhydrous ferric chloride, and surfactant are mixed or dissolved into water.
3. The etching process of Inconel625 nickel alloy according to claim 2, wherein,
firstly, adding pure water into a glass or plastic container;
adding industrial anhydrous ferric chloride powder;
after the ferric chloride powder is completely dissolved and cooled to room temperature, slowly adding concentrated hydrochloric acid, concentrated nitric acid and a surfactant;
adding pure water, and uniformly mixing the solutions to obtain the corrosive liquid.
4. The corrosion process of Inconel625 nickel alloy according to claim 1, wherein after steps S1, S2, S3, S4, clean water rinsing of the work piece is required to remove surface residual material.
5. The corrosion process of Inconel625 nickel alloy according to claim 4, wherein after step S1, the workpiece is rinsed with clean water and after leaving the water surface, a water film is formed on the surface of the workpiece, the water film needs to be kept for at least 30 seconds without breaking, otherwise the previous cleaning step is repeated.
6. The corrosion process for Inconel625 nickel alloy according to claim 1, wherein in step S1, the work piece is immersed in a degreasing liquid, wherein the degreasing liquid is a merco 4215 cleaning agent or an Ardrox 6333 cleaning agent.
7. The corrosion process of Inconel625 nickel alloy according to claim 1, wherein in step S2, the workpiece is immersed in an activating solution to remove the surface oxide layer, the temperature of the activating solution is 50-60 ℃, the immersion time is 8-12min, and the activating solution is composed of an aqueous solution of the following substances: the mass fraction of the hydrochloric acid is 350-500ml/L with the concentration of 35-36.5%.
8. The corrosion process for Inconel625 nickel alloy according to claim 1, wherein in step S4, the workpiece is immersed in the ash removal liquid at 55-65 ℃ for 2-10 minutes; the ash removal liquid consists of the following solutions in volume ratio: 20-25% of nitric acid with the mass fraction of 65-68%, 3-7% of hydrofluoric acid with the mass fraction of 55% and the balance of water.
9. The Inconel625 nickel alloy corrosion process according to claim 8, wherein the workpiece is dried or blow-dried after washing in step S4.
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| US4534823A (en) * | 1983-12-05 | 1985-08-13 | United Technologies Corporation | Chemical milling IN-100 nickel superalloy |
| JP2001140084A (en) * | 1999-08-27 | 2001-05-22 | Mec Kk | Etching solution for nickel or nickel alloy |
| CN112048720A (en) * | 2020-09-18 | 2020-12-08 | 中国航发沈阳黎明航空发动机有限责任公司 | Nickel-based powder superalloy corrosion solution and corrosion method |
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| US8859479B2 (en) * | 2011-08-26 | 2014-10-14 | United Technologies Corporation | Chemical stripping composition and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4534823A (en) * | 1983-12-05 | 1985-08-13 | United Technologies Corporation | Chemical milling IN-100 nickel superalloy |
| JP2001140084A (en) * | 1999-08-27 | 2001-05-22 | Mec Kk | Etching solution for nickel or nickel alloy |
| CN112048720A (en) * | 2020-09-18 | 2020-12-08 | 中国航发沈阳黎明航空发动机有限责任公司 | Nickel-based powder superalloy corrosion solution and corrosion method |
Non-Patent Citations (1)
| Title |
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| Ni-Cr-Mo基耐蚀合金的腐蚀;王希成;;功能材料(04);全文 * |
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Inventor after: Wang Rui Inventor after: Yu Liujian Inventor after: Sun Zhifang Inventor after: Yang Hu Inventor after: Wang Shuwen Inventor after: Liu Xin Inventor after: Chen Mingwei Inventor after: Zhang Shihui Inventor after: Fu Qianghong Inventor after: Li Juan Inventor before: Wang Shuwen Inventor before: Yu Liujian Inventor before: Liu Xin Inventor before: Chen Mingwei Inventor before: Zhang Shihui Inventor before: Yang Hu Inventor before: Wang Rui Inventor before: Sun Zhifang Inventor before: Fu Qianghong Inventor before: Li Juan |