A kind of 201 austenitic stainless steel of cold rolling is without nitric acid acidwashing technique
阅读说明：本技术 一种冷轧201奥氏体不锈钢无硝酸酸洗工艺 (A kind of 201 austenitic stainless steel of cold rolling is without nitric acid acidwashing technique ) 是由 谢霞 乔军 贺立红 尚志广 于 2019-09-23 设计创作，主要内容包括：本发明涉及一种冷轧201奥氏体不锈钢无硝酸酸洗工艺,包括以下步骤：S1、预酸洗步骤：将带钢浸入预酸洗液中进行酸洗；S2、研磨刷洗步骤：对经过预酸洗步骤的带钢进行研磨刷洗；S3、交流电电解步骤：将经过研磨刷洗步骤的带钢浸入具有电解液的电解池中进行电解酸洗；S4、第一段无硝酸酸洗步骤：将经过交流电电解后的带钢浸入第一段无硝酸酸洗液中；S5、第二段无硝酸酸洗步骤：将经过第一段无硝酸酸洗步骤后的带钢浸入第二段无硝酸酸洗液中。本发明工艺避免使用含硝酸的酸洗时产生高污染的氮氧化物和含氮废水,从而减轻环境污染。(The present invention relates to a kind of 201 austenitic stainless steels of cold rolling without nitric acid acidwashing technique, comprising the following steps: S1, pre- acid pickling step: strip is immersed and carries out pickling in pre- pickling solution；S2, grinding scrub step: grinding scrub is carried out to by the strip of pre- acid pickling step；S3, alternating current electrolysis step: cathodic pickling is carried out by immersing in the electrolytic cell with electrolyte by the strip for grinding scrub step；S4, first segment are without nitric acid acidwashing step: the strip after alternating current electrolysis is immersed first segment without in nitric acid acidwashing liquid；S5, second segment are without nitric acid acidwashing step: will immerse second segment without in nitric acid acidwashing liquid without the strip after nitric acid acidwashing step by first segment.Present invention process is avoided using the nitrogen oxides and nitrogenous effluent for generating high pollution when pickling containing nitric acid, to mitigate environmental pollution.)
1. a kind of 201 austenitic stainless steel of cold rolling is without nitric acid acidwashing technique, which comprises the following steps:
S1, pre- acid pickling step: strip being immersed and carries out pickling in pre- pickling solution, and the pre- pickling solution is sulfuric acid pickling solution, H2SO4 Concentration is 80~120g/L, and concentration of metal ions is 10~20g/L, and the temperature of pickling solution is 75~85 DEG C；
S2, grinding scrub step: grinding scrub is carried out to by the strip of pre- acid pickling step；
S3, alternating current electrolysis step: electricity is carried out in the electrolytic cell with electrolyte by immersing by the strip for grinding scrub step Pickling is solved, the electrolyte is Na2SO4And H2SO4Mixed liquor, wherein Na2SO4Concentration is 70~100g/L, by the way that H is added2SO4 Adjusting electrolyte pH is between 2~4, and the temperature of electrolyte is 85~95 DEG C, and ac power frequency range is 30~70Hz, electric current Density is 0~10A/dm3；
S4, first segment are without nitric acid acidwashing step: the strip after alternating current electrolysis is immersed into first segment without in nitric acid acidwashing liquid, The first segment is without in nitric acid acidwashing liquid, H2SO4Concentration is 50~80g/L, H2SiF6Concentration is 8~20g/L, Fe3+Concentration is 10 ~25g/L, H2O2Concentration is 8~15g/L；
S5, second segment are without nitric acid acidwashing step: will immerse second segment without nitre without the strip after nitric acid acidwashing step by first segment In sour pickling solution, in the no nitric acid acidwashing liquid, H2SO4Concentration is 30~50g/L, H2SiF6Concentration is 0~10g/L, Fe3+It is dense Degree is 0~15g/L, H2O2Concentration is 0~10g/L.
2. 201 austenitic stainless steel of cold rolling according to claim 1 is without nitric acid acidwashing technique, which is characterized in that described to grind Polish-brush washes roller brush bristle diameter that step uses as 0.5~1mm, the silicon carbide abrasive containing 150~200 mesh numbers in bristle, if Motor speed is set between 600~800rpm, current of electric size is between 130~170A.
3. 201 austenitic stainless steel of cold rolling according to claim 1 is without nitric acid acidwashing technique, which is characterized in that described pre- In acid pickling step, pickling time is 20~30s.
4. 201 austenitic stainless steel of cold rolling according to claim 1 is without nitric acid acidwashing technique, which is characterized in that described One section without nitric acid acidwashing and second segment without in nitric acid acidwashing step, acid liquor temperature is 40~60 DEG C.
5. 201 austenitic stainless steel of cold rolling according to claim 1 is without nitric acid acidwashing technique, which is characterized in that described One section without nitric acid acidwashing and second segment without in nitric acid acidwashing step, pickling time is 20~30s.
6. 201 austenitic stainless steel of cold rolling according to claim 1 is without nitric acid acidwashing technique, which is characterized in that described pre- In acid pickling step, H2SO4Concentration is 90~100g/L, and concentration of metal ions is 12~18g/L, and the temperature of pickling solution is 78~83 DEG C, pickling time is 22~28s.
7. 201 austenitic stainless steel of cold rolling according to claim 2 is without nitric acid acidwashing technique, which is characterized in that described to grind Polish-brush is washed in step, motor speed is arranged between 650~750rpm, current of electric size is between 140~160A.
8. 201 austenitic stainless steel of cold rolling according to claim 1 is without nitric acid acidwashing technique, which is characterized in that the friendship In galvanic electricity electrolysis step, Na2SO4Concentration is 75~95g/L, by the way that H is added2SO4Adjust electrolyte pH be 2.8~3.4 between, The temperature of electrolyte is 85~95 DEG C, and ac power frequency range is 40~60Hz, and current density is 4~8A/dm3。
9. 201 austenitic stainless steel of cold rolling according to claim 1 is without nitric acid acidwashing technique, which is characterized in that described One section without in nitric acid acidwashing step, H2SO4Concentration is 60~70g/L, H2SiF6Concentration is 10~18g/L, Fe3+Concentration be 13~ 20g/L, H2O2Concentration is 8~12g/L, and acid liquor temperature is 45~55 DEG C, and pickling time is 20~26s.
10. 201 austenitic stainless steel of cold rolling according to claim 1 is without nitric acid acidwashing technique, which is characterized in that described Two sections without in nitric acid acidwashing step, H2SO4Concentration is 35~45g/L, H2SiF6Concentration is 0~7g/L, Fe3+Concentration is 0~10g/ L, H2O2Concentration is 0~6g/L, and acid liquor temperature is 40~50 DEG C, and pickling time is 20~26s.
Technical field
The present invention relates to acid-washing stainless steel fields, more specifically to a kind of 201 austenitic stainless steel of cold rolling without nitric acid Acid cleaning process.
Background technique
After the annealed and mechanical scale breading of 201 austenic stainless steel belt steel of cold rolling, generally using neutral salt electrolysis pickling+mixed Acid (HNO3+ HF) acid cleaning process.But in acid cleaning process, not only sour consumption is larger, can also generate the nitrogen oxidation of a large amount of high pollutions Object and contain nitrate wastewater, bring serious harm, and purification of nitrogen oxides cost to natural environment and human production activity It is also higher with the processing cost containing nitrate wastewater.
Summary of the invention
The technical problem to be solved in the present invention is that provide a kind of 201 austenitic stainless steel of cold rolling without nitric acid acidwashing technique, It can be to avoid the nitrogen oxides and nitrogenous effluent for generating high pollution when the pickling containing nitric acid be used, to mitigate environmental pollution.
The technical solution adopted by the present invention to solve the technical problems is: construct a kind of 201 austenitic stainless steel of cold rolling without Nitric acid acidwashing technique, comprising the following steps:
S1, pre- acid pickling step: strip being immersed and carries out pickling in pre- pickling solution, and the pre- pickling solution is sulfuric acid pickling solution, H2SO4Concentration is 80~120g/L, and concentration of metal ions is 10~20g/L, and the temperature of pickling solution is 75~85 DEG C；
S2, grinding scrub step: grinding scrub is carried out to by the strip of pre- acid pickling step；
S3, alternating current electrolysis step: will by grinding scrub step strip immerse have electrolyte electrolytic cell in into Row cathodic pickling, the electrolyte are Na2SO4And H2SO4Mixed liquor, wherein Na2SO4Concentration is 70~100g/L, passes through addition H2SO4Adjusting electrolyte pH is between 2~4, and the temperature of electrolyte is 85~95 DEG C, and ac power frequency range is 30~70Hz, Current density is 0~10A/dm3；
S4, first segment are without nitric acid acidwashing step: the strip after alternating current electrolysis is immersed first segment without nitric acid acidwashing In liquid, the first segment is without in nitric acid acidwashing liquid, H2SO4Concentration is 50~80g/L, H2SiF6Concentration is 8~20g/L, Fe3+It is dense Degree is 10~25g/L, H2O2Concentration is 8~15g/L；
S5, second segment are without nitric acid acidwashing step: will immerse second segment without the strip after nitric acid acidwashing step by first segment Without in nitric acid acidwashing liquid, in the no nitric acid acidwashing liquid, H2SO4Concentration is 30~50g/L, H2SiF6Concentration is 0~10g/L, Fe3 +Concentration is 0~15g/L, H2O2Concentration is 0~10g/L.
In above scheme, the roller brush bristle diameter that the grinding scrub step uses contains 150 in bristle for 0.5~1mm The silicon carbide abrasive of~200 mesh numbers, be arranged motor speed between 600~800rpm, current of electric size 130~170A it Between
In above scheme, in the pre- acid pickling step, pickling time is 20~30s.
In above scheme, the first segment without nitric acid acidwashing and second segment without in nitric acid acidwashing step, acid liquor temperature 40 ~60 DEG C.
In above scheme, the first segment without nitric acid acidwashing and second segment without in nitric acid acidwashing step, pickling time 20 ~30s.
In above scheme, in the pre- acid pickling step, H2SO4Concentration be 90~100g/L, concentration of metal ions be 12~ 18g/L, the temperature of pickling solution are 78~83 DEG C, and pickling time is 22~28s.
In above scheme, in the grinding scrub step, motor speed is set between 650~750rpm, current of electric Size is between 140~160A.
In above scheme, in the alternating current electrolysis step, Na2SO4Concentration is 75~95g/L, by the way that H is added2SO4It adjusts Saving electrolyte pH is between 2.8~3.4, and the temperature of electrolyte is 85~95 DEG C, and ac power frequency range is 40~60Hz, electricity Current density is 4~8A/dm3。
In above scheme, the first segment is without in nitric acid acidwashing step, H2SO4Concentration is 60~70g/L, H2SiF6Concentration For 10~18g/L, Fe3+Concentration is 13~20g/L, H2O2Concentration is 8~12g/L, and acid liquor temperature is 45~55 DEG C, pickling time For 20~26s.
In above scheme, the second segment is without in nitric acid acidwashing step, H2SO4Concentration is 35~45g/L, H2SiF6Concentration For 0~7g/L, Fe3+Concentration is 0~10g/L, H2O2Concentration is 0~6g/L, and acid liquor temperature is 40~50 DEG C, pickling time 20 ~26s.
Implement 201 austenitic stainless steel of cold rolling of the invention without nitric acid acidwashing technique, has the advantages that
1, when alternating current electrolysis pickling, pole plate polarity constantly changes, and keeps belt steel surface oxide skin fast by dissolving chromium depleted layer Speed with metallic matrix is peeling-off falls off, oxide skin removal efficiency height, power consumption is low；
2, acid cleaning process of the invention is scrubbed using grinding twice by the big portion of belt steel surface before carrying out without nitric acid acidwashing Point oxide skin is removed, burden when mitigating significantly without nitric acid acidwashing, reduces subsequent pickling acid consumption；
3, the use of nitric acid it is not related in acid cleaning process of the invention, with H2SiF6HF is substituted, product surface matter is improved Amount；
4, acid cleaning process of the invention avoids metallic matrix and is corroded by HF, avoids the nitrogen oxides for generating high pollution and contains Nitrogen waste water mitigates environmental pollution.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is flow chart of 201 austenitic stainless steel of cold rolling without nitric acid acidwashing technique of the present invention.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail A specific embodiment of the invention.
Such as Fig. 1, the present invention provides a kind of 201 austenitic stainless steel of cold rolling without nitric acid acidwashing new process, specific steps packet It includes:
S1, pre- acid pickling step: strip being immersed and carries out pickling in pre- pickling solution, and the pre- pickling solution is sulfuric acid pickling solution, H2SO4Concentration is 80~120g/L, and concentration of metal ions is 10~20g/L, and the temperature of pickling solution is 75~85 DEG C；
Grinding scrub step: S2 carries out grinding scrub, the roller brush bristle diameter of use to by the strip of pre- acid pickling step For 0.5~1mm, motor speed is arranged between 600~800rpm in the silicon carbide abrasive containing 150~200 mesh numbers in bristle, Current of electric size is between 130~170A；
S3, alternating current electrolysis step: will by grinding scrub step strip immerse have electrolyte electrolytic cell in into Row cathodic pickling, the electrolyte are Na2SO4And H2SO4Mixed liquor, wherein Na2SO4Concentration is 70~100g/L, passes through addition H2SO4Adjusting electrolyte pH is between 2~4, and the temperature of electrolyte is 85~95 DEG C, and ac power frequency range is 30~70Hz, Current density is 0~10A/dm3；
S4, first segment is without nitric acid acidwashing step: the strip after alternating current electrolysis is immersed first segment without nitric acid acidwashing In liquid, the first segment is without in nitric acid acidwashing liquid, H2SO4Concentration is 50~80g/L, H2SiF6Concentration is 8~20g/L, Fe3+It is dense Degree is 10~25g/L, H2O2Concentration is 8~15g/L；
S5, second segment is without nitric acid acidwashing step: will immerse second segment without the strip after nitric acid acidwashing step by first segment Without in nitric acid acidwashing liquid, in the no nitric acid acidwashing liquid, H2SO4Concentration is 30~50g/L, H2SiF6Concentration is 0~10g/L, Fe3 +Concentration is 0~15g/L, H2O2Concentration is 0~10g/L.
Further, in above-mentioned S1 step, pickling time is 20~30s.
Further, in above-mentioned S4, S5 step, acid liquor temperature is 40~60 DEG C.
Further, in above-mentioned S4, S5 step, pickling time is 20~30s.
Preferably as one of embodiment, in above-mentioned S1 step, H2SO4Concentration is 90~100g/L, concentration of metal ions For 12~18g/L, the temperature of pickling solution is 78~83 DEG C, and pickling time is 22~28s.
Preferably as one of embodiment, in above-mentioned S2 step, motor speed is set between 650~750rpm, motor Size of current is between 140~160A.
Preferably as one of embodiment, in above-mentioned S3 step, Na2SO4Concentration is 75~95g/L, by the way that H is added2SO4 Adjusting electrolyte pH is between 2.8~3.4, and the temperature of electrolyte is 85~95 DEG C, and ac power frequency range is 40~60Hz, Current density is 4~8A/dm3。
Preferably as one of embodiment, in above-mentioned S4 step, H2SO4Concentration is 60~70g/L, H2SiF6Concentration is 10 ~18g/L, Fe3+Concentration is 13~20g/L, H2O2Concentration is 8~12g/L, and acid liquor temperature is 45~55 DEG C, pickling time 20 ~26s.
Preferably as one of embodiment, in above-mentioned S5 step, H2SO4Concentration is 35~45g/L, H2SiF6Concentration is 0 ~7g/L, Fe3+Concentration is 0~10g/L, H2O2Concentration be 0~6g/L, acid liquor temperature be 40~50 DEG C, pickling time be 20~ 26s。
By above-mentioned S1~S5 step, belt steel surface oxide skin and chromium depleted layer can be removed, and belt steel surface is made to generate one Layer passivating film.In the present embodiment, when using alternating current electrolysis pickling, pole plate polarity constantly changes, and makes band by dissolving chromium depleted layer For steel surface oxide skin quickly with the peeling-off removal that falls off of metallic matrix, oxide skin removal efficiency is high.It is carrying out without nitric acid acidwashing Belt steel surface major part oxide skin is removed using grinding scrub before, greatly reduces subsequent pickling acid consumption.In addition, of the invention Acid cleaning process in be not related to the use of nitric acid, avoid generate high pollution nitrogen oxides and nitrogenous effluent, mitigate environment Pollution.
Three specific embodiments are set forth below:
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