CN112981384B - Coating liquid and coating method for iron-chromium-aluminum alloy - Google Patents
Coating liquid and coating method for iron-chromium-aluminum alloy Download PDFInfo
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- CN112981384B CN112981384B CN202110184486.9A CN202110184486A CN112981384B CN 112981384 B CN112981384 B CN 112981384B CN 202110184486 A CN202110184486 A CN 202110184486A CN 112981384 B CN112981384 B CN 112981384B
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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
- C23C22/60—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 alkaline aqueous solutions with pH greater than 8
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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
- C23C22/60—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 alkaline aqueous solutions with pH greater than 8
- C23C22/62—Treatment of iron or alloys based thereon
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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
- C23C22/60—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 alkaline aqueous solutions with pH greater than 8
- C23C22/66—Treatment of aluminium or alloys based thereon
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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
- C23C22/73—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 characterised by the process
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Abstract
The invention provides a coating liquid for iron-chromium-aluminum alloy and a coating method, belonging to the technical field of iron-chromium-aluminum alloy coatings, wherein the coating liquid comprises the following raw materials in parts by weight: sulfate: 15-30 parts of phosphoric acid: 4-8 parts; calcium hydroxide: 10-20 parts; water: 41-71 parts. After the liquid coating provided by the invention is adopted, the iron-chromium-aluminum alloy is drawn, the surface quality is good, and no scratch defect exists.
Description
Technical Field
The invention belongs to the technical field of iron-chromium-aluminum alloy coatings, and particularly relates to a coating liquid and a coating method for iron-chromium-aluminum alloy.
Background
The surface of the iron-chromium-aluminum alloy needs to be coated so that a lubricant can be attached to the surface of the iron-chromium-aluminum alloy, and the coating serves as a lubricant carrier, so that the quality of the iron-chromium-aluminum alloy coating directly influences the attachment of the lubricant, and the attachment amount of the lubricant directly influences the effect of a lubricating film formed during drawing and is the key point for the quality of the drawing surface. Therefore, the coating has good quality, and surface defects such as scratches and the like can be avoided in the drawing process of the iron-chromium-aluminum alloy. The coating has certain lubricating effect and also has the following performance (1) the coating can be firmly combined with the surface of a drawing material, and the coating can not be damaged and stripped before entering a die hole or in the die hole. (2) The surface of the coating should be rough and porous so that the lubricant can better adsorb, fill and be carried into the die holes on the uneven surfaces and in the pores. (3) The lubricating film formed by the coating and the lubricant has good ductility, can deform along with the deformation of the metal, and always keeps a complete isolated lubricating film between the metal and the die; (4) the coating has good heat-resistant and pressure-resistant performance, does not damage and run off at high temperature and high pressure, does not decompose and coke, and keeps perfect isolation and lubrication functions; (5) the coating does not damage the surface quality of steel, and is easy to clean and remove after being drawn, so that the subsequent working procedure is convenient to process; (6) the coating is nontoxic and pollution-free, the operating environment can be kept clean, and the waste liquid treatment does not pollute the environment; (7) for the areas with moisture, the coating should meet some special requirements of moisture resistance (no moisture regain), difficult rusting of the steel wire surface and the like.
The existing coating process is a lime coating process, the iron-chromium-aluminum alloy wire after mechanical descaling is soaked in lime liquid at 70-100 ℃ for 20-30min and then taken out, and then is dried in a drying furnace at 100-150 ℃ for 1-2h, the lime liquid is prepared by mixing 20% of quicklime by mass and 80% of hot water by mass, then stirring for 1h, and then diluting for 5-15 times, and the coating liquid is easy to scratch defects in the drawing process after coating.
Disclosure of Invention
The invention provides a coating liquid for iron-chromium-aluminum alloy and a coating method, wherein the formed coating can be tightly combined with an iron-chromium-aluminum alloy matrix, and the coating has no quality problems of scratching the surface and the like in the drawing process after lubrication.
On one hand, the invention provides a coating liquid for iron-chromium-aluminum alloy, which comprises the following raw materials in parts by weight:
sulfate: 15-30 parts of (by weight),
phosphoric acid: 4-8 parts;
calcium hydroxide: 10-20 parts;
water: 41-71 parts.
Furthermore, the masking liquid also comprises 0.2-0.7 parts by weight of lubricant.
Further, the lubricant is molybdenum disulfide.
Further, the acid ratio of the coating liquid is 4.5-6.
Further, the temperature of the masking liquid is 80-100 ℃.
Further, the sulfate is at least one of: sodium sulfate and potassium sulfate.
Further, the mass concentration of the phosphoric acid is 15-25%. In another aspect, the present invention provides a method of coating an iron-chromium-aluminum alloy, the method comprising,
putting the iron-chromium-aluminum alloy into the coating liquid of any one of claims 1 to 7 for 2 to 3 times for coating; the masking liquid comprises the following raw materials in parts by weight: sulfate salt: 15-30 parts of phosphoric acid: 4-8 parts; calcium hydroxide: 10-20 parts; water: 41-71 parts.
Further, the time of each coating is 5-8 min.
Further, the masking liquid flows dynamically, and the flow rate of the masking liquid is 20-50m 3 /min。
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the invention provides a coating liquid and a coating method for iron-chromium-aluminum alloy, wherein sulfate and phosphoric acid are added into the coating liquid, the phosphoric acid can generate a phosphating film in the phosphating reaction of the iron-chromium-aluminum alloy, and the sulfate can promote the formation of the phosphating film, so that the phosphating film with a porous structure is formed on the surface of the iron-chromium-aluminum alloy, and can be effectively used as a carrier of a lubricant to form a chemical adsorption film, therefore, the lubricating effect of the coating liquid is obvious, and the coating liquid and the coating method can play an important role particularly on a continuous drawing unit with large deformation; and the phosphating film formed by the coating liquid through chemical reaction is a phosphoric acid film which is relatively rough, so that the roughness of the coating is greatly increased, a lubricant can be well attached to the surface of the iron-chromium-aluminum alloy wire, and the surface quality after drawing is greatly improved. After the liquid coating provided by the invention is adopted, the iron-chromium-aluminum alloy is drawn, the surface quality is good, and no scratch defect exists.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic view of a coating tank according to an embodiment of the present invention;
FIG. 2 is a macro topography of a drawn Fe-Cr-Al alloy wire according to an embodiment of the present invention;
FIG. 3 is a macro topography of a drawn Fe-Cr-Al alloy wire provided in comparative example 1;
fig. 4 is a partial view of fig. 3.
In figure 1, 1-a material penetrating frame, 2-a groove body, 3-a working layer and 4-a steam stirrer.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
on one hand, the invention provides a coating solution for iron-chromium-aluminum alloy, which comprises the following raw materials in parts by weight:
sulfate: 15-30 parts of (by weight),
phosphoric acid: 4-8 parts;
calcium hydroxide: 10-20 parts;
water: 41-71 parts.
In the present invention, the functions of the raw materials are as follows:
phosphoric acid: when the iron-chromium-aluminum alloy is contacted with the coating liquid, metal elements Me (Fe, Cr and Al) in the iron-chromium-aluminum alloy and phosphoric acid generate a phosphorization effect to form an insoluble phosphorization film, the reaction process is divided into three steps, and a first-step reaction equationThe formula is as follows: h 3 PO 4 ＝H + +H 2 PO - The second reaction is Me and H + Reaction to form ion Me 2+ The third reaction step is 3Me 2+ +2H 2 PO - +2H + +6e - ＝Me 3 (PO 4 ) 2 +3H 2 . The phosphoric acid is too much in weight part, the coating is too thick, a large amount of residues can be remained at the die opening in the drawing process, the drawing resistance is increased, the steel wire is easy to stretch, the phosphoric acid is too little in weight part, the surface adhesion is not uniform, the attached lubricant is not uniform, and the steel wire is easy to scratch after being drawn.
Sulfate: fe in the Fe-Cr-Al alloy forms ferrous ions in the phosphoric acid reaction process (see the second step of reaction), sulfate radicals in the sulfate and the ferrous ions form ferrous sulfate, and the reaction is Fe 2+ +SO 4 2- ＝FeSO 4 In the process of coating, the iron-chromium-aluminum alloy moves out of the gap of the coating liquid, the temperature of the surface of the iron-chromium-aluminum alloy is reduced, ferrous sulfate is separated out and attached to the surface of the alloy, the ion migration speed is reduced, the permeation of hydrogen is prevented, the corrosion of the alloy caused by the over-fast phosphating effect is prevented, and therefore the generation of a phosphating film can be controlled, and the phosphating film is more uniform. Over-weight part of sulfate and indissolvable FeSO 4 Too much precipitate, which prolongs the reaction time of returning to the solution and slows down the formation of the phosphating film. FeSO formed when the mass fraction of the sulfate is too small 4 Less, dry the in-process, can not prevent to adhere to on the phosphoric acid on surface and continue the reaction, cause the reaction easily excessively, not good control, the base member corrodes inequality, influences finished product quality, and the while bears the weight of inequality, and lubricated effect is not good.
Calcium hydroxide: in the coating process, calcium hydroxide can cover the surface of the phosphating film, so that the thickness of the phosphating film is increased, and the thickness of the phosphating film can carry more lubricant; on the other hand, calcium hydroxide can also adjust the pH of the coating solution. The excessive weight portions of the calcium hydroxide and the excessive pH value inhibit the progress of the phosphating reaction. The calcium hydroxide is too little in weight part, and the effect of increasing the thickness of the phosphating film is not obvious.
The invention provides a coating liquid and a coating method for iron-chromium-aluminum alloy, wherein sulfate and phosphoric acid are added into the coating liquid, the phosphoric acid can generate a phosphating film in the phosphating reaction of the iron-chromium-aluminum alloy, and the sulfate can promote the formation of the phosphating film, so that the phosphating film with a porous structure is formed on the surface of the iron-chromium-aluminum alloy, and can be effectively used as a carrier of a lubricant to form a chemical adsorption film, therefore, the lubricating effect of the coating liquid is obvious, and the coating liquid and the coating method can play an important role particularly on a continuous drawing unit with large deformation; and the phosphating film formed by the coating liquid through chemical reaction is a phosphoric acid film which is relatively rough, so that the roughness of the coating is greatly increased, a lubricant can be well attached to the surface of the iron-chromium-aluminum alloy wire, and the surface quality after drawing is greatly improved.
As an optional embodiment of the invention, the coating liquid further comprises 0.2-0.7 parts by weight of a lubricant.
The lubricant is pre-added into the coating liquid, so that a layer of lubricant can be pre-formed on the surface of the phosphating film, and the lubrication is more uniform and sufficient. The lubricant is too much in weight, a large amount of lubricant and coating can be remained at the die opening in the drawing process, the drawing resistance is increased, the wire stretching phenomenon of the steel wire is easy to generate, the lubricant is too little in weight, the lubricant is not uniform, and the steel wire is easy to scratch after being drawn.
As an alternative embodiment of the invention, the lubricant is molybdenum disulphide.
In an alternative embodiment of the present invention, the coating solution has an acid ratio of 4.5 to 6.
In the present invention, the acid ratio means the ratio of total acidity to free acidity, and is also the pH value. If the pH value is too high, the phosphating reaction can be inhibited; if the pH value is too low, corrosion pits can appear on the surface of the iron-chromium-aluminum alloy in the later annealing process, thereby influencing the surface quality.
As an alternative embodiment of the invention, the temperature of the coating liquid is 80-100 ℃. The temperature of the coating liquid is too high, and the time delay of airing is long, so that the working efficiency is low; the temperature of the coating liquid is too low, the phosphating reaction is insufficient, and the formed coating is not uniform.
As an alternative embodiment of the present invention, the sulfate includes, but is not limited to, at least one of the following: sodium sulfate and potassium sulfate.
In an alternative embodiment of the present invention, the phosphoric acid is present in a concentration of 15 to 25% by mass.
In another aspect, an embodiment of the present invention further provides a method for coating an iron-chromium-aluminum alloy, the method including,
putting the iron-chromium-aluminum alloy into the coating liquid for 5-8min for 2-3 times to carry out coating; the masking liquid comprises the following raw materials in parts by weight: sulfate salt: 15-30 parts of phosphoric acid: 4-8 parts; calcium hydroxide: 10-20 parts; water: 41-71 parts. The coating times are excessive, the reaction is excessive, the surface coating is too thick, and the subsequent drawing is not facilitated; the coating times are too few, the phosphating reaction is insufficient, and the formed coating is uneven.
As an alternative embodiment of the invention, the time for each coating is 5-8 min.
The coating time is too long, the reaction is excessive, the surface coating is too thick, and the subsequent drawing is not facilitated; the coating time is too short, the phosphating reaction is insufficient, and the formed coating is uneven.
As an optional embodiment of the invention, the coating liquid is in dynamic flow, and the bottom blowing flow rate of the coating liquid in the coating is 20-50m 3 Stirring with steam/min.
Too large steam flow can cause resource waste, and too small steam flow can cause deposition in the coating groove and cannot uniformly coat.
In the invention, the coating process is carried out in a coating tank, and with reference to fig. 1, the coating tank comprises a tank body 2, an electric heating wire, a working layer 3, a material penetrating frame 1 and a steam stirrer 4.
Wherein, the inner side surface of the tank body 2 is provided with a working layer 3, and an electric heating wire is arranged between the working layer 3 and the tank body 2. The working layer 3 can protect the electric heating wire from being polluted, so that the coating groove is heated uniformly.
The material penetrating frame 1 comprises a supporting rod and a U-shaped alloy fixing rod which are arranged on a frame, the supporting rod is arranged at the upper part of the groove body 2, two ends of the alloy wire fixing rod are fixedly arranged on the supporting rod, and the alloy wire fixing rod is arranged in the groove body; steam stirringThe device 4 is arranged at the bottom of the working layer 3. Steam is supplied at a pressure of 20-50m by means of a steam stirrer 4 3 The flow stirring coating liquid of/min guarantees the even unanimity of coating liquid concentration everywhere in the coating groove to make iron chromium aluminum alloy wire surface phosphating film even unanimous, and its roughness is big, is favorable to adhering to emollient, the surface quality problem of fish tail phenomenon appears when avoiding drawing, thereby improves the drawing surface quality of iron chromium aluminum alloy wire, has solved because of being heated the problem that often has crystal block and coating liquid to concentrate the bottom in the inhomogeneous coating liquid, makes when clearing up the coating groove comparatively easy.
As an optional implementation mode, a thermocouple can be arranged in the working layer to measure the temperature of the coating liquid in the coating tank, so as to ensure the accuracy of temperature measurement;
the coating liquid and the coating method for iron-chromium-aluminum alloy of the present invention will be described in detail with reference to examples, comparative examples and experimental data.
Examples 1 to 4
Examples 1 to 4 provide a coating liquid for an iron-chromium-aluminum alloy and a coating method, wherein the composition of the coating liquid is shown in table 1, and the mass concentration of phosphoric acid is 15 to 25%.
The coating method comprises the following steps:
putting the iron-chromium-aluminum alloy wire into the coating liquid for 3 times to carry out phosphating reaction to generate a phosphating film, wherein the temperature of the coating liquid is shown in table 2; coating liquid is coated at a thickness of 20-50m in the process of phosphating reaction 3 Stirring was carried out with bottom-blown steam at a flow rate of/min, and the time of the phosphating reaction was as shown in Table 2.
Comparative example 1
Comparative example 1 provides a coating solution obtained by mixing 20% by mass of quicklime and 80% by mass of water, stirring for 1 hour, and diluting 10 times, the temperature of the coating solution being 80 ℃.
And (3) putting the iron-chromium-aluminum alloy wire into the coating liquid for 5min for coating.
The coating thicknesses formed by the fe-cr-al alloy wires provided in examples 1 to 4 and comparative example 1 are shown in table 3, and the surface qualities were observed after drawing thereof are shown in table 3.
TABLE 1
| Numbering | Sodium sulfate | Phosphoric acid | Calcium hydroxide | Molybdenum disulfide | Water (I) |
| Example 1 | 18 | 4 | 12 | / | 45 |
| Example 2 | 25 | 6 | 15 | 0.6 | 60 |
| Example 3 | 20 | 5 | 18 | 0.2 | 48 |
| Example 4 | 26 | 8 | 19 | 0.4 | 52 |
TABLE 2
TABLE 3
| Number of | Coating thickness/mm of iron-chromium-aluminum alloy | Appearance of the product |
| Example 1 | 0.5 | Good and no defect |
| Example 2 | 0.8 | Good and no defect |
| Example 3 | 1.0 | Good and free of defects |
| Example 4 | 0.6 | Good and no defect |
| Comparative example 1 | 0.2 | Has scratch defect |
After the iron-chromium-aluminum alloy coating liquid provided by the embodiments 1 to 4 of the invention is used for coating the iron-chromium-aluminum alloy, the thickness of the coating is 0.5 to 1.0mm, and the iron-chromium-aluminum alloy with the coating is drawn after being coated with the lubricant, so that the surface quality is good and no defect exists, and the details are shown in FIG. 2; after coating the iron-chromium-aluminum alloy with the coating solution provided in comparative example 1, the coating thickness was 0.2mm, and the coated iron-chromium-aluminum alloy was drawn after being coated with the lubricant, and had scratch defects, as shown in fig. 3 and 4.
The invention provides a coating liquid and a coating method for iron-chromium-aluminum alloy, wherein sulfate and phosphoric acid are added into the coating liquid, the phosphoric acid can generate a phosphating film in the phosphating reaction of the iron-chromium-aluminum alloy, and the sulfate can promote the formation of the phosphating film, so that the phosphating film with a porous structure is formed on the surface of the iron-chromium-aluminum alloy, and can be effectively used as a carrier of a lubricant to form a chemical adsorption film, therefore, the lubricating effect of the coating liquid is obvious, and the coating liquid and the coating method can play an important role particularly on a continuous drawing unit with large deformation; the phosphate film formed by the chemical reaction of the coating liquid is a phosphoric acid film which is relatively rough, so that the roughness of the coating is greatly increased, a lubricant can be well attached to the surface of the iron-chromium-aluminum alloy wire, and the surface quality after drawing is greatly improved. After the liquid coating provided by the invention is adopted, the iron-chromium-aluminum alloy is drawn, the surface quality is good, and no scratch defect exists.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. The coating liquid for the iron-chromium-aluminum alloy is characterized by comprising the following raw materials in parts by weight:
sulfate: 15-30 parts of (by weight),
phosphoric acid: 4-8 parts;
calcium hydroxide: 10-20 parts;
water: 41-71 parts;
the acid ratio of the masking liquid is 4.5-6;
the sulfate is at least one of the following: sodium sulfate, potassium sulfate;
the mass concentration of the phosphoric acid is 15-25%.
2. The coating solution for iron-chromium-aluminum alloy according to claim 1, characterized in that the coating solution further comprises 0.2-0.7 parts by weight of lubricant.
3. The coating solution for iron-chromium-aluminum alloy according to claim 2, wherein the lubricant is molybdenum disulfide.
4. The coating solution for the iron-chromium-aluminum alloy according to claim 1, wherein the temperature of the coating solution is 80-100 ℃.
5. A method of coating an iron-chromium-aluminum alloy, the method comprising,
placing the iron-chromium-aluminum alloy into the coating liquid of any one of claims 1 to 4 for coating for 2 to 3 times.
6. An iron chromium aluminium alloy coating process according to claim 5, wherein the time per coating is 5-8 min.
7. The Fe-Cr-Al alloy coating method of claim 5, wherein the bottom blowing flow rate of the coating liquid is 20-50m 3 Stirring with steam/min.
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|---|---|---|---|---|
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