CN114892155A - Normal-temperature blackening treatment liquid for alloy steel surface and method for blackening alloy steel surface at normal temperature - Google Patents

Normal-temperature blackening treatment liquid for alloy steel surface and method for blackening alloy steel surface at normal temperature Download PDF

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CN114892155A
CN114892155A CN202210375300.2A CN202210375300A CN114892155A CN 114892155 A CN114892155 A CN 114892155A CN 202210375300 A CN202210375300 A CN 202210375300A CN 114892155 A CN114892155 A CN 114892155A
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alloy steel
blackening
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blackening treatment
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周勇
闫福安
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Wuhan Institute of Technology
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Wuhan Institute of Technology
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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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/50—Treatment of iron or alloys based thereon
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/78—Pretreatment of the material to be coated
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment

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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
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  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
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  • Chemical Treatment Of Metals (AREA)

Abstract

The invention belongs to the technical field of material corrosion and protection, and particularly relates to a normal-temperature blackening treatment liquid for the surface of alloy steel and a method for blackening the surface of alloy steel at normal temperature by using the same. The invention selects copper sulfate (CuSO) 4 ) And ferrous sulfate (FeSO) 4 ) Is prepared from filming agent and hydrogen peroxide (H) 2 O 2 ) Is oxidant, nickel sulfate (NiSO) 4 ) Is promoter, sodium tartrate (C) 4 H 4 O 6 Na 2 ) Is complexing agent, boric acid (H) 3 BO 4 ) Provides a green environment-friendly steel surface used as a stabilizer and octyl phenol polyoxyethylene ether (OP-10) as a surfactant, and is particularly suitable for the surface of steelIn particular to a treatment fluid for blackening the surface of alloy steel at normal temperature and a using method of the treatment fluid. The invention solves the problem of harm to life health and natural environment caused by the fact that the treatment fluid for the normal-temperature acid blackening treatment of the steel surface widely used at present contains elements such as selenium (Se), phosphorus (P) and the like to a certain extent.

Description

Normal-temperature blackening treatment liquid for alloy steel surface and method for blackening alloy steel surface at normal temperature
Technical Field
The invention belongs to the technical field of material corrosion and protection, and particularly relates to a normal-temperature blackening treatment liquid for the surface of alloy steel and a method for blackening the surface of alloy steel at normal temperature by using the same.
Background
The blackening treatment of the surface of the steel means that a layer of black conversion film is deposited on the surface of the steel by a chemical method, so that the purposes of improving the performances of corrosion resistance, friction property, light reflection property and the like of the surface of the steel and having a certain decoration effect are achieved, and the blackening treatment of the surface of the steel and iron is particularly suitable for surface treatment of steel and iron members, workpieces and parts which work in grease. The blackening treatment of the surface of steel and the related technology and process thereof are developed to the present, and mainly comprise two types of high-temperature alkaline blackening and normal-temperature acid blackening.
The high-temperature alkaline blackening treatment of the surface of the steel needs to be carried out at a high temperature of more than 100 ℃, and the main components of the treatment liquid are strong alkali (sodium hydroxide (NaOH) is generally selected) and nitrite (sodium nitrite (NaNO) is generally selected) 2 )). In the strongly alkaline atmosphere of sodium hydroxide (NaOH), sodium nitrite (NaNO) is utilized 2 ) The strong oxidizing property oxidizes the surface of the steel and deposits a layer of ferroferric oxide (Fe) on the surface of the steel 3 O 4 ) The black conversion coating is the main component, thereby achieving the purpose of blackening the surface of the steel. After long-term development and improvement, the technology and process of high-temperature alkaline blackening treatment of the surface of the steel are mature, and the adhesive force and various properties of the film layer also meet the requirements; however, the high-temperature alkaline blackening treatment of the steel surface has prominent defects, such as: high temperature above 100 ℃ causes high energy consumption, and the use of nitrite causes harm to life health and natural environment. Therefore, the "high-temperature alkaline blackening" has been gradually replaced by the "normal-temperature acid blackening" and finally completely replaced by the "normal-temperature acid blackening".
In contrast, the normal-temperature acid blackening treatment of the steel surface has no special requirement on temperature and can be carried out in a wider normal-temperature range, and the treatment liquid contains components such as a film-forming agent, an oxidizing agent, an accelerating agent, a complexing agent, a stabilizing agent and the like, wherein the film-forming agent is a core component of the treatment liquid. The earlier treatment liquid for the normal-temperature acidic blackening treatment of the surface of steel mainly comprises copper sulfate (CuSO) 4 ) And containing tetravalent selenium (Se) 4+ ) Selenious acid (H) of 2 SeO 3 ) Or selenium oxide (SeO) 2 ) As a film-forming agentOxidation reduction reaction of tetravalent selenium (Se) 4+ ) Reduction to selenium (Se) 2+ ) A black conversion film which takes copper selenide (CuSe) as a main component and contains a small amount of ferrous selenide (FeSe) and copper oxide (CuO) is deposited on the surface of the steel, so that the aim of blackening the surface of the steel is fulfilled, and the film has good adhesive force and various performances and can meet the requirements. With the development and improvement of the technology and process for the normal-temperature acid blackening treatment of the surface of steel, a certain amount of Phosphate (PO) is added into the treatment fluid 4 3- ) Or hydrogen phosphate (H) 2 PO 4 - ) The film has better adhesive force and various performances, so that the steel surface is blackened in two-in-one mode by combining the normal-temperature acid blackening treatment and the phosphating treatment, and the two-in-one blackening is actually upgraded to be blackened in the normal-temperature acid.
Up to now, the blackening treatment of the surface of steel is mainly realized by 'acid blackening at normal temperature' and 'two-in-one blackening'. Compared with high-temperature alkaline blackening, the environmental protection type hair blackening agent has the advantages that the environmental protection type hair blackening agent is greatly improved in the aspects of harm to life health and natural environment by 'room-temperature acidic blackening' and 'two-in-one blackening'; however, with the increasingly strict environmental protection requirements and the increasing awareness of environmental protection, the technology and process for the normal-temperature acid blackening treatment of the steel surface still have some problems and defects to be solved, especially in the aspect of harm to life health and natural environment. Firstly, the selenium (Se) element in the film forming agent of the processing liquid for the normal-temperature acidic blackening is mainly tetravalent selenium (Se) 4+ ) In the form of tetravalent selenium (Se) 4+ ) The toxicity of (A) is known to be the highest toxicity of selenium (Se) -containing compounds, wherein selenious acid (H) is used as well 2 SeO 3 ) Selenium (Se) -containing compounds with the highest toxicity; secondly, the phosphorus (P) element added in the two-in-one blackening treating liquid is not like tetravalent selenium (Se) 4+ ) It is highly toxic, but its use in large quantities leads to "eutrophication" of natural resources, especially of water resources, and therefore the use of phosphorus (P) -containing compounds should also be avoided as much as possible.
Disclosure of Invention
Aiming at the aim of 'normal-temperature acid blackening treatment of steel surface' in the prior artThe problem still existed in the previous method, the invention selects copper sulfate (CuSO) 4 ) And ferrous sulfate (FeSO) 4 ) Is prepared from filming agent and hydrogen peroxide (H) 2 O 2 ) Is oxidant, nickel sulfate (NiSO) 4 ) Is promoter, sodium tartrate (C) 4 H 4 O 6 Na 2 ) Is complexing agent, boric acid (H) 3 BO 4 ) Provides a green and environment-friendly treatment fluid for blackening the surface of steel, particularly the surface of alloy steel at normal temperature by taking a stabilizer and octyl phenol polyoxyethylene ether (OP-10) as a surfactant, and provides a use method of the treatment fluid. The invention solves the problem of harm to life health and natural environment caused by the fact that the treatment fluid for the normal-temperature acid blackening treatment of the steel surface widely used at present contains elements such as selenium (Se), phosphorus (P) and the like to a certain extent.
The technical scheme provided by the invention is as follows:
the normal-temperature blackening treatment fluid for the alloy steel surface comprises the following components in parts by weight: 4.72-9.25g/L of copper sulfate, 1.25-3.74g/L of ferrous sulfate, 2.83-4.61g/L of hydrogen peroxide, 5.74-8.16g/L of nickel sulfate, 4.38-6.27g/L of sodium tartrate, 2.72-4.06g/L of boric acid and 0.25-0.67g/L of octyl phenol polyoxyethylene ether.
Based on the technical scheme, the treatment solution for blackening the surface of the alloy steel at normal temperature can be used at normal temperature to form a black film layer on the surface of the alloy steel, wherein the black film layer mainly comprises copper oxide and a small amount of ferroferric oxide. The treatment solution does not contain elements such as selenium (Se), phosphorus (P) and the like.
The preparation method of the normal-temperature blackening treatment fluid for the alloy steel surface comprises the following steps: and mixing the components according to the formula amount at normal temperature to obtain the alloy steel surface normal-temperature blackening treatment liquid.
The invention also provides a method for blackening the surface of the alloy steel at normal temperature, which comprises the following steps:
1) preparing the alloy steel surface normal-temperature blackening treatment liquid;
2) carrying out surface pretreatment on the alloy steel;
3) carrying out alloy steel surface blackening treatment by adopting the alloy steel surface normal-temperature blackening treatment liquid;
4) and carrying out surface post-treatment on the alloy steel.
The method for blackening the alloy steel surface at normal temperature specifically comprises the following steps:
1) preparing a blackening treatment solution: copper sulfate (CuSO) 4 )4.72-9.25g/L, ferrous sulfate (FeSO) 4 )1.25-3.74g/L hydrogen peroxide (H) 2 O 2 )2.83-4.61g/L, nickel sulfate (NiSO) 4 )5.74-8.16g/L, sodium tartrate (C) 4 H 4 O 6 Na 2 )4.38-6.27g/L of boric acid (H) 3 BO 4 )2.72-4.06g/L, 0.25-0.67g/L of octyl phenol polyoxyethylene ether (OP-10);
2) pretreatment of alloy steel surface: the method comprises the following steps of alkali washing oil removal, water washing, acid washing rust removal, water washing, acid washing activation and water washing, wherein each working procedure of pretreatment can be repeatedly carried out for a plurality of times until the purposes of oil removal, rust removal and activation are achieved, the last water washing step must ensure that the surface of an alloy steel workpiece does not have the adhered, bright and clean steel matrix of alkali washing oil removal, acid washing rust removal and acid washing activation residual liquid, and the workpiece is immediately immersed into blackening treatment liquid after the pretreatment is completed, so that the exposure time of the workpiece in the air is reduced as much as possible;
3) alloy steel surface blackening treatment: immersing the pretreated alloy steel workpiece into blackening treatment liquid for 4-6 minutes in a normal-temperature environment, taking out, and standing in air for 1-2 minutes;
4) post-treatment of alloy steel surface: washing, air drying and sealing, wherein the alloy steel workpiece after blackening treatment is washed after standing for 1-2 minutes in the air, the washing can be repeatedly carried out for a plurality of times to ensure that no residual liquid of the blackening treatment liquid is attached to the surface of the alloy steel workpiece, the alloy steel workpiece is dried after being washed clean, and then the alloy steel workpiece is immersed in dewatering rust preventive oil for sealing.
By the treatment of the technical scheme, the alloy steel surface is black, the film adhesion reaches 0 grade (a grid cutting method), and the alloy steel can be exposed in dry air for a long time without changing properties.
Drawings
FIG. 1 is a macroscopic photograph before and after a surface normal temperature acid blackening treatment and a microscopic photograph after the blackening treatment of an alloy steel in example 1 according to the present invention.
FIG. 2 shows a macro photograph before and after the surface normal temperature acid blackening treatment of the alloy steel and a micro photograph after the blackening treatment in example 2 according to the present invention.
FIG. 3 is a macroscopic photograph before and after the surface normal temperature acid blackening treatment of the alloy steel and a microscopic photograph after the blackening treatment in example 3 according to the present invention.
FIG. 4 is a macroscopic photograph before and after the surface normal temperature acid blackening treatment and a microscopic photograph after the blackening treatment of the alloy steel in example 4 according to the present invention.
FIG. 5 shows a macro-photograph and a micro-photograph of alloy steel before and after the surface is subjected to the acid blackening treatment at normal temperature in example 5 according to the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1:
step one, preparing a blackening treatment solution: the blackening treatment solution, copper sulfate (CuSO), is prepared according to the following proportion 4 )4.72g/L, ferrous sulfate (FeSO) 4 )1.25g/L hydrogen peroxide (H) 2 O 2 )2.83g/L, nickel sulfate (NiSO) 4 )5.74g/L, sodium tartrate (C) 4 H 4 O 6 Na 2 )4.38g/L boric acid (H) 3 BO 4 )2.72g/L and 0.25g/L of octyl phenol polyoxyethylene ether (OP-10), and the mixture is placed in a normal temperature environment for standby after being prepared. Secondly, alloy steel surface pretreatment: the method is characterized by sequentially carrying out the processes of alkali washing oil removal, water washing, acid washing rust removal, water washing, acid washing activation and water washing pretreatment, wherein the processes can be repeatedly carried out for a plurality of times until the purposes of oil removal, rust removal and activation are achieved, namely the surface of the alloy steel workpiece meets the requirement of blackening treatment (a bright and clean steel matrix is presented, and meanwhile, residual liquid of alkali washing oil removal, acid washing rust removal and acid washing activation is not attached to the surface of the steel matrix). The third step: alloy steel surface blackening treatment: immersing the alloy steel workpiece pretreated in the second step into the alloy steel workpiece prepared in the first step and in a normal-temperature environmentThe black treatment solution was taken out after 4 minutes, and then allowed to stand in the air for 1 minute. The fourth step: post-treatment of alloy steel surface: and (3) sequentially carrying out water washing, air drying and sealing post-treatment processes, standing the alloy steel workpiece subjected to blackening treatment in the air for 1 minute, then washing, repeatedly carrying out the water washing process for multiple times until no residual liquid of the blackening treatment liquid is attached to the surface of the alloy steel workpiece, washing with water, then carrying out air drying, finally soaking the alloy steel workpiece subjected to blackening treatment in dewatering rust-proof oil for sealing, and thus finishing the blackening treatment of the whole alloy steel workpiece.
Example 2:
step one, preparing a blackening treatment solution: the blackening treatment liquid, copper sulfate (CuSO), is prepared according to the following proportion 4 )9.25g/L, ferrous sulfate (FeSO) 4 )3.74g/L hydrogen peroxide (H) 2 O 2 )4.61g/L, nickel sulfate (NiSO) 4 )8.16g/L, sodium tartrate (C) 4 H 4 O 6 Na 2 )6.27g/L boric acid (H) 3 BO 4 )4.06g/L and 0.67g/L of octyl phenol polyoxyethylene ether (OP-10), and the mixture is placed in a normal temperature environment for standby after being prepared. Secondly, alloy steel surface pretreatment: the method is characterized by sequentially carrying out the processes of alkali washing oil removal, water washing, acid washing rust removal, water washing, acid washing activation and water washing pretreatment, wherein the processes can be repeatedly carried out for a plurality of times until the purposes of oil removal, rust removal and activation are achieved, namely the surface of the alloy steel workpiece meets the requirement of blackening treatment (a bright and clean steel matrix is presented, and meanwhile, residual liquid of alkali washing oil removal, acid washing rust removal and acid washing activation is not attached to the surface of the steel matrix). The third step: alloy steel surface blackening treatment: and immersing the alloy steel workpiece pretreated in the second step into the blackening treatment liquid prepared in the first step and in a normal-temperature environment for 6 minutes, taking out, and standing in the air for 2 minutes. The fourth step: post-treatment of alloy steel surface: sequentially carrying out water washing, air drying and sealing post-treatment processes, standing the alloy steel workpiece subjected to blackening treatment in the air for 2 minutes, then washing, repeatedly carrying out the water washing process for multiple times until no residual liquid of the blackening treatment liquid is attached to the surface of the alloy steel workpiece, washing the alloy steel workpiece completely, then carrying out air drying, finally soaking the alloy steel workpiece subjected to blackening treatment into dewatering rust-proof oil for sealing, and thus finishing the whole processAnd (5) blackening the gold steel workpiece.
Example 3:
step one, preparing a blackening treatment solution: the blackening treatment liquid, copper sulfate (CuSO), is prepared according to the following proportion 4 )5.94g/L, ferrous sulfate (FeSO) 4 )1.78g/L hydrogen peroxide (H) 2 O 2 )3.25g/L, nickel sulfate (NiSO) 4 )6.07g/L, sodium tartrate (C) 4 H 4 O 6 Na 2 )4.81g/L boric acid (H) 3 BO 4 )3.14g/L and 0.36g/L of octyl phenol polyoxyethylene ether (OP-10), and the mixture is placed in a normal temperature environment for standby after being prepared. Secondly, alloy steel surface pretreatment: the method is characterized by sequentially carrying out the processes of alkali washing oil removal, water washing, acid washing rust removal, water washing, acid washing activation and water washing pretreatment, wherein the processes can be repeatedly carried out for a plurality of times until the purposes of oil removal, rust removal and activation are achieved, namely the surface of the alloy steel workpiece meets the requirement of blackening treatment (a bright and clean steel matrix is presented, and meanwhile, residual liquid of alkali washing oil removal, acid washing rust removal and acid washing activation is not attached to the surface of the steel matrix). The third step: alloy steel surface blackening treatment: and (3) immersing the alloy steel workpiece pretreated in the second step into the blackening treatment liquid prepared in the first step and in a normal-temperature environment for 4.5 minutes, taking out, and standing in the air for 1.5 minutes. The fourth step: post-treatment of alloy steel surface: and sequentially carrying out water washing, air drying and sealing post-treatment processes, standing the alloy steel workpiece subjected to blackening treatment in the air for 1.5 minutes, then washing, repeatedly carrying out the water washing process for many times until no residual liquid of the blackening treatment liquid is attached to the surface of the alloy steel workpiece, washing with water, then carrying out air drying, finally soaking the alloy steel workpiece subjected to blackening treatment into dehydrated antirust oil for sealing, and thus finishing the blackening treatment of the whole alloy steel workpiece.
Example 4:
step one, preparing a blackening treatment solution: the blackening treatment liquid, copper sulfate (CuSO), is prepared according to the following proportion 4 )6.38g/L, ferrous sulfate (FeSO) 4 )2.47g/L hydrogen peroxide (H) 2 O 2 )3.72g/L, nickel sulfate (NiSO) 4 )6.94g/L, sodium tartrate (C) 4 H 4 O 6 Na 2 )5.34g/L boric acid (H) 3 BO 4 )3.76g/L and 0.47g/L of octyl phenol polyoxyethylene ether (OP-10), and the mixture is placed in a normal temperature environment for standby after being prepared. Secondly, alloy steel surface pretreatment: the method is characterized by sequentially carrying out the processes of alkali washing oil removal, water washing, acid washing rust removal, water washing, acid washing activation and water washing pretreatment, wherein the processes can be repeatedly carried out for a plurality of times until the purposes of oil removal, rust removal and activation are achieved, namely the surface of the alloy steel workpiece meets the requirement of blackening treatment (a bright and clean steel matrix is presented, and meanwhile, residual liquid of alkali washing oil removal, acid washing rust removal and acid washing activation is not attached to the surface of the steel matrix). The third step: alloy steel surface blackening treatment: and immersing the alloy steel workpiece pretreated in the second step into the blackening treatment liquid prepared in the first step and in a normal-temperature environment for 4.5 minutes, taking out the alloy steel workpiece, and standing the alloy steel workpiece in the air for 1.5 minutes. The fourth step: post-treatment of alloy steel surface: and sequentially carrying out water washing, air drying and sealing post-treatment processes, standing the alloy steel workpiece subjected to blackening treatment in the air for 1.5 minutes, then washing, repeatedly carrying out the water washing process for many times until no residual liquid of the blackening treatment liquid is attached to the surface of the alloy steel workpiece, washing with water, then carrying out air drying, finally soaking the alloy steel workpiece subjected to blackening treatment into dehydrated antirust oil for sealing, and thus finishing the blackening treatment of the whole alloy steel workpiece.
Example 5:
step one, preparing a blackening treatment solution: the blackening treatment liquid, copper sulfate (CuSO), is prepared according to the following proportion 4 )8.56g/L, ferrous sulfate (FeSO) 4 )3.34g/L hydrogen peroxide (H) 2 O 2 )4.18g/L, nickel sulfate (NiSO) 4 )7.63g/L, sodium tartrate (C) 4 H 4 O 6 Na 2 )5.92g/L boric acid (H) 3 BO 4 )3.96g/L and 0.58g/L of octyl phenol polyoxyethylene ether (OP-10), and the mixture is placed in a normal temperature environment for standby after being prepared. Secondly, alloy steel surface pretreatment: sequentially carrying out the procedures of alkali washing oil removal, water washing, acid washing rust removal, water washing, acid washing activation and water washing pretreatment, wherein the procedures can be repeatedly carried out for a plurality of times until the purposes of oil removal, rust removal and activation are achieved, namely the surface of the alloy steel workpiece meets the requirement of blackening treatment (a bright and clean steel matrix is presented and the surface of the steel matrix is simultaneously treatedNo alkaline washing for oil removal, acid washing for rust removal and acid washing for activated residual liquid attachment). The third step: alloy steel surface blackening treatment: and immersing the alloy steel workpiece pretreated in the second step into the blackening treatment liquid prepared in the first step and in a normal-temperature environment for 4.5 minutes, taking out the alloy steel workpiece, and standing the alloy steel workpiece in the air for 1.5 minutes. The fourth step: post-treatment of alloy steel surface: and sequentially carrying out water washing, air drying and sealing post-treatment processes, standing the alloy steel workpiece subjected to blackening treatment in the air for 1.5 minutes, then washing, repeatedly carrying out the water washing process for many times until no residual liquid of the blackening treatment liquid is attached to the surface of the alloy steel workpiece, washing with water, then carrying out air drying, finally soaking the alloy steel workpiece subjected to blackening treatment into dehydrated antirust oil for sealing, and thus finishing the blackening treatment of the whole alloy steel workpiece.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. The normal-temperature blackening treatment fluid for the alloy steel surface is characterized by comprising the following components in parts by weight: 4.72-9.25g/L of copper sulfate, 1.25-3.74g/L of ferrous sulfate, 2.83-4.61g/L of hydrogen peroxide, 5.74-8.16g/L of nickel sulfate, 4.38-6.27g/L of sodium tartrate, 2.72-4.06g/L of boric acid and 0.25-0.67g/L of octyl phenol polyoxyethylene ether.
2. The preparation method of the alloy steel surface normal temperature blackening treatment liquid according to claim 1, characterized by comprising the following steps: and mixing the components according to the formula amount at normal temperature to obtain the alloy steel surface normal-temperature blackening treatment liquid.
3. A method for blackening the surface of alloy steel at normal temperature is characterized by comprising the following steps:
1) preparing the alloy steel surface normal temperature blackening treatment liquid of claim 1;
2) carrying out surface pretreatment on the alloy steel;
3) carrying out alloy steel surface blackening treatment by adopting the alloy steel surface normal temperature blackening treatment liquid of claim 1;
4) and carrying out surface post-treatment on the alloy steel.
4. The method for blackening the surface of alloy steel at normal temperature according to claim 3, wherein the step 2) comprises the steps of: and carrying out at least one pretreatment process, wherein the pretreatment process comprises alkali washing for removing oil, water washing, acid washing for removing rust, water washing, acid washing for activating and water washing.
5. The method for blackening the surface of alloy steel at normal temperature according to claim 3, wherein the step 3) comprises the steps of: immersing the alloy steel workpiece pretreated in the step 2) into the alloy steel surface normal-temperature blackening treatment liquid of claim 1 for 4-6 minutes in a normal-temperature environment, taking out, and standing in air for 1-2 minutes.
6. The method for blackening the surface of alloy steel at normal temperature according to claim 3, wherein the step 4) comprises the steps of: and sequentially carrying out water washing, air drying and sealing, wherein the water washing frequency is at least once.
CN202210375300.2A 2022-04-11 2022-04-11 Normal-temperature blackening treatment liquid for alloy steel surface and method for blackening alloy steel surface at normal temperature Pending CN114892155A (en)

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CN103046038A (en) * 2012-12-06 2013-04-17 安徽未来表面技术有限公司 Room temperature blackening agent suitable for iron casting and method for preparing room temperature blackening agent suitable for iron casting
CN110158069A (en) * 2019-05-14 2019-08-23 浙江机电职业技术学院 A kind of quick-acting environment-friendly type blackening agent for surface of steel room temperature and its application

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CN103046038A (en) * 2012-12-06 2013-04-17 安徽未来表面技术有限公司 Room temperature blackening agent suitable for iron casting and method for preparing room temperature blackening agent suitable for iron casting
CN110158069A (en) * 2019-05-14 2019-08-23 浙江机电职业技术学院 A kind of quick-acting environment-friendly type blackening agent for surface of steel room temperature and its application

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