CN109652789B - Method for treating surface of inner wall of boiler - Google Patents
Method for treating surface of inner wall of boiler Download PDFInfo
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- CN109652789B CN109652789B CN201910158786.2A CN201910158786A CN109652789B CN 109652789 B CN109652789 B CN 109652789B CN 201910158786 A CN201910158786 A CN 201910158786A CN 109652789 B CN109652789 B CN 109652789B
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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
- C23C22/24—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 containing hexavalent chromium compounds
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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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- 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
Abstract
The invention discloses a method for treating the surface of the inner wall of a boiler, which comprises the following steps: washing a boiler by adopting a mixed solution of 12-15% of sodium metaphosphate, 3-6% of potassium polyphosphate and 8-10% of aminotriethanol; then, adopting a mixed solution of 15% of dilute hydrochloric acid and 0.1% of thiourea, and washing the boiler at the temperature of 40-60 ℃; then adding the boiler into a mixed solution of ammonium bicarbonate and barium chloride, and soaking for 1-2 min; heating after soaking, drying, adding the obtained product into a zinc titanate solution when the temperature of a boiler is 110-130 ℃, soaking for 0.5-1.5 min when the temperature of the zinc titanate solution is 435-470 ℃, then adding the boiler into a passivation solution for passivation, adding water of 40-45 ℃, and heating and evaporating to obtain the finished product. The method for treating the inner surface of the boiler can increase the thermal abrasiveness and the smoothness of the boiler and inhibit the generation of corrosion.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for treating the surface of an inner wall of a boiler.
Background
The main working principle of the boiler is that heat energy released after fuel combustion or waste heat in industrial production is transferred to water in a container to make the water reach required temperature or certain pressure steam, and the thermodynamic equipment has the advantages of strong fuel adaptability, high combustion efficiency and the like. When fuel burning, the fuel granule flows in the combustion chamber ceaselessly because the effect of gravity, all can make the surface of furnace body be heated and worn seriously, and there is certain inhomogeneity in the angle of scouring away and the direction of fuel granule on the furnace body face simultaneously to lead to the not only bottom of furnace body to be heated and worn seriously, the furnace body lateral wall also all has the heated wear of certain degree moreover.
In the prior art, the heat-resistant treatment of the boiler surface is generally to coat a high-temperature-resistant coating on the surface of a furnace body, but in actual operation, the coating on the surface of the furnace body is easy to peel off and lose efficacy under the scouring action of fuel particles because the bonding strength of the coating and the surface of the furnace body is low, and further, regular inspection and coating once and once are needed, so that the cost investment is large.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a treatment method, which can ensure that the surface of a boiler has better thermal wear resistance and smoothness.
The technical scheme is as follows: the invention provides a method for brightening the surface of a boiler, which comprises the following specific steps:
washing a boiler by adopting a mixed solution of 12-15% of sodium metaphosphate, 3-6% of potassium polyphosphate and 8-10% of aminotriethanol; then, adopting a mixed solution of 15% of dilute hydrochloric acid and 0.1% of thiourea, and washing the boiler at the temperature of 40-60 ℃; in this step, if the conditions are not well controlled, the adhesion of the plating layer is poor, the zinc plating layer is not formed, or the zinc layer is not peeled off, and therefore, the temperature of the mixed solution is preferably 55 ℃.
Then adding the boiler into a mixed solution of ammonium bicarbonate and barium chloride, and soaking for 1-2 min; further research shows that: NH in the mixed solution of ammonium bicarbonate and barium chloride4The concentration of Cl is 100-150 g/L, ZnCl2The concentration of the metal oxide is 150-180 g/L, the effect is better when the temperature is 70-85 ℃, and the metal oxide can keep a workpiece to have certain activity before dip plating so as to avoid secondary oxidation and enhance the combination of a plating layer and a matrix.
Heating after soaking, drying, adding the zinc titanate solution into the zinc titanate solution when the temperature of a boiler is 110-130 ℃, soaking for 0.5-1.5 min when the temperature of the zinc titanate solution is 435-470 ℃, and heating and evaporating the zinc titanate solution, wherein the heating and evaporating temperature is generally 120 ℃. In the process, the temperature of the zinc titanate solution is very important, the temperature is too low, the zinc titanate solution has poor fluidity, the coating thickness is thick and uneven, sagging is easy to generate, and the appearance quality is poor; the temperature is high, the fluidity of the zinc titanate solution is good, the zinc titanate solution is easy to separate from a workpiece, the sagging and wrinkle phenomena are reduced, the adhesive force is strong, the coating is thin, the appearance is good, and the production efficiency is high; however, the temperature is too high, the iron loss of the workpiece and the zinc pot is serious, a large amount of zinc slag is generated, the quality of a zinc dipping layer is influenced, corrosion is easily caused, the surface color is hard to see, and the zinc consumption is high. Therefore, the temperature of the zinc titanate solution is preferably 435-445 ℃. The concentration of the zinc titanate solution is 60-80 g/L.
And then adding the boiler into a passivation solution for passivation, wherein the passivation solution is a mixed solution of potassium dichromate with the concentration of 80-100 g/L and sulfuric acid with the concentration of 3-4 ml/L. The process can improve the atmospheric corrosion resistance of the boiler surface, reduce or prolong the occurrence time of white rust and keep a plating layer to have good appearance. And adding water of 40-45 ℃, and heating and evaporating to obtain the product.
Has the advantages that: the method of the invention is adopted to treat the surface of the boiler, thereby increasing the thermal abrasiveness and the smoothness of the boiler and inhibiting the generation of corrosion.
The specific implementation mode is as follows:
example 1
The boiler is washed by a mixed solution of 12% of sodium metaphosphate, 3% of potassium polyphosphate and 8% of aminotriethanol until the boiler is completely soaked by water. Then, a mixed solution of 15% of dilute hydrochloric acid and 0.1% of thiourea is adopted to wash the boiler, and the temperature of the mixed solution is 60 ℃.
Adding the boiler into the mixed solution of ammonium bicarbonate and barium chloride (NH)4Cl concentration 150g/L, ZnCl2Concentration of 150 g/L), temperature of 70 deg.C, and soaking time of 1 min.
After soaking, heating, drying, and when the temperature of a boiler is 120 ℃, putting the solution into a zinc titanate solution, the temperature of the zinc titanate solution is 450 ℃, soaking for 0.5min, and heating and evaporating the zinc titanate solution, wherein the heating and evaporating temperature is generally 120 ℃.
And then adding the boiler into a passivation solution for passivation, wherein the passivation solution is a mixed solution of 80-100 g/L potassium dichromate and 3-4 ml/L sulfuric acid. Then adding into water of 40 ℃ and heating for evaporation. And (4) finishing.
The treated boiler inner wall has bright and fine appearance and no sagging and wrinkling phenomena. The surface roughness Ra0.16 μm. The heated wear rate is 4cm at 200 DEG C3Perm, the hydrochloric acid infiltration loss is 0.01 percent in 48 hours.
Example 2
The boiler is washed by adopting a mixed solution of 15% of sodium metaphosphate, 6% of potassium polyphosphate and 8% of aminotriethanol until the boiler is completely soaked by water. Then, a mixture of 13% dilute hydrochloric acid and 0.1% thiourea was used to wash the boiler, and the temperature of the mixture was 40 ℃.
Adding the boiler into the mixed solution of ammonium bicarbonate and barium chloride (NH)4Cl concentration 150g/L, ZnCl2Concentration of 150 g/L), temperature of 85 ℃, and soaking time of 2 min.
After soaking, heating, drying, and when the temperature of a boiler is 120 ℃, putting the solution into a zinc titanate solution, the temperature of the zinc titanate solution is 450 ℃, soaking for 0.5min, and heating and evaporating the zinc titanate solution, wherein the heating and evaporating temperature is generally 120 ℃.
Then adding the boiler into passivation solution for passivation, wherein the passivation solution is a mixed solution of 80g/L potassium dichromate and 4ml/L sulfuric acid.
Then adding into water of 40 ℃ and heating for evaporation. And (4) finishing. The treated boiler inner wall has bright and fine appearance and no sagging and wrinkling phenomena. The surface roughness Ra0.18 μm. The heated wear rate is 3cm at 200 DEG C3Perm, the hydrochloric acid infiltration loss is 0.01 percent in 48 hours.
Example 3
The boiler is washed by a mixed solution of 12% of sodium metaphosphate, 3% of potassium polyphosphate and 8% of aminotriethanol until the boiler is completely soaked by water. Then, a mixed solution of 15% of dilute hydrochloric acid and 0.1% of thiourea is adopted to wash the boiler, and the temperature of the mixed solution is 60 ℃.
Adding the boiler into the mixed solution of ammonium bicarbonate and barium chloride (NH)4Cl concentration 100g/L, ZnCl2Concentration of 150 g/L), temperature of 85 deg.C, and soaking time of 1 min.
After soaking, heating, drying, and when the temperature of a boiler is 120 ℃, putting the solution into a zinc titanate solution, the temperature of the zinc titanate solution is 450 ℃, soaking for 0.5min, and heating and evaporating the zinc titanate solution, wherein the heating and evaporating temperature is generally 120 ℃.
Then adding the boiler into passivation solution for passivation, wherein the passivation solution is a mixed solution of 100g/L potassium dichromate and 4ml/L sulfuric acid. Then adding into water of 40 ℃ and heating for evaporation. And (4) finishing.
The treated boiler inner wall has bright and fine appearance and no sagging and wrinkling phenomena. The surface roughness Ra0.17 μm. The heated wear rate is 3cm at 200 DEG C3Perm, the hydrochloric acid infiltration loss is 0.01 percent in 48 hours.
Claims (7)
1. A method for treating the surface of the inner wall of a boiler is characterized by comprising the following steps:
washing a boiler by adopting a mixed solution of 12-15% of sodium metaphosphate, 3-6% of potassium polyphosphate and 8-10% of aminotriethanol; then adopting a mixed solution of 13-15% of dilute hydrochloric acid and 0.1-0.2% of thiourea, and washing the boiler at the temperature of 40-60 ℃; then adding the boiler into a mixed solution of ammonium bicarbonate and barium chloride, and soaking for 1-2 min; heating, drying, adding a zinc titanate solution when the temperature of a boiler is 110-130 ℃, soaking for 0.5-1.5 min, and heating and evaporating the zinc titanate solution; then adding the boiler into passivation solution for passivation, adding water with the temperature of 40-45 ℃, and heating and evaporating to obtain the catalyst; the passivation solution is a mixed solution of 80-100 g/L potassium dichromate and 3-4 ml/L sulfuric acid.
2. The method of claim 1, wherein the mixed solution of ammonium bicarbonate and barium chloride is NH4The concentration of Cl is 100-150 g/L, ZnCl2The concentration of (b) is 150-180 g/L.
3. The method according to claim 1, wherein the temperature of the mixed solution of ammonium bicarbonate and barium chloride is 70 to 85 ℃.
4. The method of claim 1, wherein the zinc titanate solution is at a temperature of from 435 to 470 ℃.
5. The method of claim 1, wherein the zinc titanate solution has a temperature of 435 to 445 ℃.
6. The method according to claim 1, wherein the concentration of the zinc titanate solution is 60 to 80 g/L.
7. The method of claim 1, wherein said heating is carried out at a temperature of 120 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910158786.2A CN109652789B (en) | 2019-03-04 | 2019-03-04 | Method for treating surface of inner wall of boiler |
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| CN201910158786.2A CN109652789B (en) | 2019-03-04 | 2019-03-04 | Method for treating surface of inner wall of boiler |
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| CN109652789B true CN109652789B (en) | 2020-09-11 |
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| CN110359269A (en) * | 2019-08-07 | 2019-10-22 | 李小虎 | A method of improving umbrella cloth ultraviolet resistance |
| CN115537789A (en) * | 2022-10-31 | 2022-12-30 | 安徽华威矿产设备有限公司 | Surface passivation anticorrosion equipment for processing stainless steel sieve plate |
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| JP4462378B2 (en) * | 2007-12-26 | 2010-05-12 | 住友金属工業株式会社 | Manufacturing method of steel pipe with inner rib |
| CN101487119B (en) * | 2009-02-18 | 2011-01-19 | 西安协力动力科技有限公司 | Metal composite passivation process after boiler cleaning in heat power plant |
| CN102586772B (en) * | 2012-02-24 | 2013-08-21 | 济宁新格瑞水处理有限公司 | Passivation process after chemical cleaning of boiler |
| CN106032575A (en) * | 2015-03-18 | 2016-10-19 | 东莞新科技术研究开发有限公司 | Boiler washing method |
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Inventor after: Hu Guangzhong Inventor after: Xu Chao Inventor before: Xu Chao |
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Effective date of registration: 20200817 Address after: 230000 6-2508, Golden Plaza, 155 Jinzhai Road, Shushan District, Hefei City, Anhui Province Applicant after: Anhui Shengyuan Contract Energy Management Co.,Ltd. Address before: 277525 No. 314 Longshantou Village, Chaihudian Town, Tengzhou City, Zaozhuang City, Shandong Province Applicant before: Xu Chao |
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