CN101413121A - Galvanizing layer phosphatization and chromium-free passivation combined metal surface treatment process - Google Patents
Galvanizing layer phosphatization and chromium-free passivation combined metal surface treatment process Download PDFInfo
- Publication number
- CN101413121A CN101413121A CNA2007101813983A CN200710181398A CN101413121A CN 101413121 A CN101413121 A CN 101413121A CN A2007101813983 A CNA2007101813983 A CN A2007101813983A CN 200710181398 A CN200710181398 A CN 200710181398A CN 101413121 A CN101413121 A CN 101413121A
- Authority
- CN
- China
- Prior art keywords
- phosphatization
- chromium
- treatment process
- surface treatment
- metal surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Chemical Treatment Of Metals (AREA)
Abstract
The invention relates to a metallic surface treatment process combining zinc coat phosphorization and chromium-free passivation, which comprises the steps of cleaning a part to be plated, galvanizing, passivating, aging and the like, and is characterized in that a phosphorization process is performed after the galvanization process. The metallic surface treatment process breaks through the prior common antiseptic treatment process on metallic surfaces, performs the phosphorization on a plating zinc coat, combines the chromium-free passivation, and avoids the disadvantages of common phosphorization on steel pieces or direct chromium-free passivation on the zinc coat, thus the process not only improves the corrosion resistance of galvanized parts, but also accords with the requirements on environmental protection and safety.
Description
Technical field
The present invention relates to a kind of metal surface treatment process, the metal surface treatment process that particularly a kind of galvanizing layer phosphatization combines with chromium-free deactivation.
Background technology
Zinc-plated is the effective ways that improve the corrosion resistance nature of iron and steel, but also easily corrodes through galvanized iron and steel in a humid environment, makes the corrosion product of its surface formation white or become ash dark-coloured.Therefore, be to increase the erosion resistance of zinc coating, increase that it is ornamental, normally the chromating that carries out zinc coating behind the steel galvanization is again handled, to improve the corrosion resistance nature of zinc-plated sheet material or galvanized workpiece.Zinc coating is after chromating is handled, the surface of zinc coating can form the chromium ion passive film that one deck exists with trivalent and sexavalence form, wherein trivalent chromium is formed network as skeleton, sexavalent chrome is dispersed in it and jello forms film, the former has advantages of higher stability, can make passive film have certain thickness and excellent mechanical intensity; The latter then has self-repair function, thereby solidity to corrosion is fine, and at present, chromating technology is simple, binding force of membrane good, cost is low, corrosion resistance is good, it is wider to use.But, contain chromium ion in chromating liquid and the formed passive film thereof to the harm of HUMAN HEALTH and environment, government progressively limits use, the discharging of chromic salt.Thereby the Unchromium Passivation of Galvanized Zinc Layer processing has become the antiseptic developing direction in metallic surface, existing Chromium-free passivating treatment method has inorganic Passivation Treatment and organic Passivation Treatment, inorganic salts such as molybdate, tungstate, silicate, rare-earth salts etc., organic salt such as phytic acid, Weibull, organic huge legendary turtle compound, acrylic resin and epoxy resin etc.But all be difficult to have simultaneously self-healing, the good corrosion resistance of chromate passivation film.Bonderizing is meant that the metallic surface contacts with the acidic solution of phosphoric acid dihydric salt, chemical reaction takes place and generates the chemical treatment method on a kind of surface of stable insoluble mineral compound rete in the metallic surface.The purpose of phosphatization mainly is, provides protection to matrix metal, prevents that to a certain extent metal is corroded, and can take precautions against being applied to paint preceding bottoming, improves the sticking power and the anti-corrosion capability of paint film layer, plays in the metal cold machining process that antifriction is lubricated to be used.But the phosphatize phosphate coat on steel part top layer is made up of a series of crystal that vary in size, and forms the vesicular structure of fine cracks on the crystalline tie point, this porous crystalline structure wear resistance, and erosion resistance is relatively poor.
Summary of the invention
Goal of the invention of the present invention just provides the process of surface treatment that a kind of galvanizing layer phosphatization combines with chromium-free deactivation, overcomes the harm that contains in conventional chromating liquid and the formed passive film thereof HUMAN HEALTH and environment; Chromium-free deactivation is difficult to have simultaneously self-healing, the corrosion resistance nature of chromate passivation film; Shortcoming such as crystalline structure wear resistance, the rotproofness of phosphatize phosphate coat be relatively poor behind the bonderizing.Both satisfied the requirement of Environmental Safety, realized again than using the more excellent corrosion resistance nature of conventional chromating zinc coating.
Purpose of the present invention mainly is to realize by the following technical solutions:
The metal surface treatment process that a kind of galvanizing layer phosphatization combines with chromium-free deactivation, the technology that is adopted comprise that unplated piece cleans, and be zinc-plated, passivation, and operation such as aging is characterized in that: also have the phosphatization operation after zinc-plated operation.
The operational condition of described phosphatization operation is, the free acidity of phosphatization liquid (FA) is 1.5-2.5, and total acidity (TA) is 20-25, and temperature is 40-60 ℃, and the time is 40-70 second.
Also will carry out bright dipping operation and table accent operation before described phosphatization operation, described bright dipping operation is that plating piece is immersed 2-5% salpeter solution bright dipping, and is bright in vain until zinc coating; It is that employing concentration is 1-3g/L that described table is transferred operation, and PH is 8-10 colloidal state titanium phosphate table adjustment, is 10-50 seconds between the table timing.
The operational condition of the passivation procedure that is adopted is, total acidity (TA) is 1.5-2.0, and pH value will be 10-50 ℃ for the 3-6 temperature.
The present invention has broken through the general anticorrosion treatment technology in existing metallic surface, on electro-galvanized layer, carry out phosphatization,, avoided the drawback of common phosphatization of steel part or the direct chromium-free deactivation of zinc coating in conjunction with chromium-free deactivation, both improve the corrosion resistance nature of galvanized workpiece, met the Environmental Safety requirement again.
Specific embodiment
Preferred enforcement of the present invention is: the metal surface treatment process that a kind of galvanizing layer phosphatization combines with chromium-free deactivation, the technology that is adopted comprise that unplated piece cleans, and be zinc-plated, passivation, and operation such as aging is characterized in that: also have the phosphatization operation after zinc-plated operation.
The unplated piece cleaning process is: electrochemical deoiling → pickling → electrolytic degreasing → hydrochloric acid activation → acid chlorization potassium is zinc-plated, and this process can guarantee that unplated piece cleans thoroughly.
Potassium chloride zinc plating process is to adopt the single salt plating bath that does not contain complex compound, can make wastewater treatment easy, and the luminance brightness of coating and leveling property are better than other zinc-plated systems.The composition of galvanizing flux is zinc chloride: 50-90g/l, Repone K 200-280g/l, boric acid 25-35g/l, L-818 softening agent 20-40mg/l, L-818 brightening agent 1-3mg/l, operational condition is: PH is 4.8-5.8, cathode current density is 1-3A/dm, temperature 10-40 ℃, electroplating time is 30-60 minute.
The gained galvanized workpiece will enter the phosphorous chemical industry preface after bright dipping operation and table accent operation, described bright dipping operation is that plating piece is immersed 2-5% salpeter solution bright dipping, and is bright in vain until zinc coating; It is that employing concentration is 1-3g/L that described table is transferred operation, and PH is 8-10 colloidal state titanium phosphate table adjustment, is 10-50 seconds between the table timing.The operational condition of phosphatization operation is, the free acidity of phosphatization liquid (FA) is 1.5-2.5, and total acidity (TA) is 20-25, and temperature is 40-60 ℃, and the time is 40-70 second.After the phosphatization process operations was finished, the surface of zinc coating generated the fine and close phosphatize phosphate coat of one deck white, and film heavily is 3.0-3.8g/m
2It is manganese salt: 0.5-10g/L, cobalt salt: 0.6-0.8g/L, zinc salt: 2-15g/L, promotor: 0.5-10g/L, phosphoric acid or phosphoric acid salt: 5-20g/L, nitrate radical: 6-10g/L that above-mentioned employed phosphatization liquid contains composition.
After the phosphatization operation is finished, after the pure washing in three roads, carry out chromium-free deactivation, the operational condition of passivation procedure is, total acidity (TA) is 1.5-2.0, and pH value is 3-6, and temperature will be 10-50 ℃.The passivating solution that is adopted contains 50-500mg/L nickel ion and 200-1500mg/L phosphate anion.
After passivation procedure is finished, carry out burin-in process again, what burin-in process adopted is furnace drying method, and bake out temperature is 80-90 ℃, drying time 20-30 minute.Can make plating piece obtain the inferior light silver gray protective membrane of one deck grace after the drying, this has also just finished the process of surface treatment that whole galvanizing layer phosphatization combines with chromium-free deactivation.
Claims (4)
1. metal surface treatment process that galvanizing layer phosphatization combines with chromium-free deactivation, the technology that is adopted comprise that unplated piece cleans, and be zinc-plated, passivation, and operation such as aging is characterized in that: also have the phosphatization operation after zinc-plated operation.
2. the metal surface treatment process that a kind of galvanizing layer phosphatization as claimed in claim 1 combines with chromium-free deactivation, it is characterized in that: the operational condition of described phosphatization operation is, the free acidity of phosphatization liquid (FA) is 1.5-2.5, total acidity (TA) is 20-25, temperature is 40-60 ℃, and the time is 40-70 second.
3. the metal surface treatment process that a kind of galvanizing layer phosphatization as claimed in claim 1 combines with chromium-free deactivation, it is characterized in that: before the phosphatization operation, also will carry out bright dipping operation and table accent operation, described bright dipping operation is that plating piece is immersed 2-5% salpeter solution bright dipping, and is bright in vain until zinc coating; It is that employing concentration is 1-3g/L that described table is transferred operation, and PH is 8-10 colloidal state titanium phosphate table adjustment, is 10-50 seconds between the table timing.
4. as claimed in claim 1 a kind of, it is characterized in that: the operational condition of the passivation procedure that is adopted is, total acidity (TA) is 1.5-2.0, and pH value is 3-6, and temperature will be 10-50 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101813983A CN101413121A (en) | 2007-10-19 | 2007-10-19 | Galvanizing layer phosphatization and chromium-free passivation combined metal surface treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101813983A CN101413121A (en) | 2007-10-19 | 2007-10-19 | Galvanizing layer phosphatization and chromium-free passivation combined metal surface treatment process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101413121A true CN101413121A (en) | 2009-04-22 |
Family
ID=40593853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101813983A Pending CN101413121A (en) | 2007-10-19 | 2007-10-19 | Galvanizing layer phosphatization and chromium-free passivation combined metal surface treatment process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101413121A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051616A (en) * | 2010-11-23 | 2011-05-11 | 广东万和新电气股份有限公司 | Surface treatment method for movable iron core of fuel gas proportional valve |
| CN107460471A (en) * | 2017-06-26 | 2017-12-12 | 安徽雷萨重工机械有限公司 | A kind of corrosion protection preprocess method of engineering machinery oil tank |
| CN113913889A (en) * | 2021-09-22 | 2022-01-11 | 成都飞机工业（集团）有限责任公司 | Galvanized phosphating pipe joint and method for reducing surface roughness thereof |
| CN115505913A (en) * | 2022-11-03 | 2022-12-23 | 广州市钫立新材料科技有限公司 | Steel passivator and passivating method |
-
2007
- 2007-10-19 CN CNA2007101813983A patent/CN101413121A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051616A (en) * | 2010-11-23 | 2011-05-11 | 广东万和新电气股份有限公司 | Surface treatment method for movable iron core of fuel gas proportional valve |
| CN102051616B (en) * | 2010-11-23 | 2012-10-03 | 广东万和新电气股份有限公司 | Surface treatment method for movable iron core of fuel gas proportional valve |
| CN107460471A (en) * | 2017-06-26 | 2017-12-12 | 安徽雷萨重工机械有限公司 | A kind of corrosion protection preprocess method of engineering machinery oil tank |
| CN113913889A (en) * | 2021-09-22 | 2022-01-11 | 成都飞机工业（集团）有限责任公司 | Galvanized phosphating pipe joint and method for reducing surface roughness thereof |
| CN115505913A (en) * | 2022-11-03 | 2022-12-23 | 广州市钫立新材料科技有限公司 | Steel passivator and passivating method |
| CN115505913B (en) * | 2022-11-03 | 2023-11-14 | 广州市钫立新材料科技有限公司 | Steel passivating agent and passivating method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| USRE38285E1 (en) | Treating solution and treating method for forming protective coating films on metals | |
| CN100585004C (en) | The chromium-free passivation liquid that is used for galvanized steel sheet surface | |
| US11987888B2 (en) | Trivalent chromium chemical conversion treatment liquid for zinc or zinc alloy base and chemical conversion treatment method using the same | |
| JP2009179848A (en) | Steel sheet for container and method of manufacturing the same | |
| CN101619473B (en) | Method for galvanizing workpiece surface for anticorrosion | |
| KR910002568B1 (en) | Phosphating process for zinc-plated metals | |
| US20040156999A1 (en) | Black trivalent chromium chromate conversion coating | |
| CN101413121A (en) | Galvanizing layer phosphatization and chromium-free passivation combined metal surface treatment process | |
| JP4615807B2 (en) | Manufacturing method of surface-treated steel sheet, surface-treated steel sheet, and resin-coated surface-treated steel sheet | |
| EP2857553A1 (en) | Trivalent chromium-conversion processing solution containing aluminum-modified colloidal silica | |
| JP5549837B2 (en) | Rust treatment solution for rust prevention of chromium plating film and rust prevention treatment method | |
| GB2255783A (en) | Chromate conversion coatings containing an inorganic silicate; silicate compositions | |
| JP5336742B2 (en) | Chemical conversion treatment method for forming a trivalent chromium chemical conversion coating having good heat and corrosion resistance on zinc or zinc alloy plating | |
| US11008659B2 (en) | Trivalent chromium chemical conversion liquid for zinc or zinc alloy bases and chemical conversion coating film | |
| KR102074773B1 (en) | Fe-X Flash Electronic Plating Solution, Method for Manufacturing the Galvanized Steel Sheet and Galvanized Steel Sheet Thereof | |
| CN110291229B (en) | Aqueous alkaline electrolyte for depositing a zinc-containing layer on the surface of a metal blank | |
| US11408078B2 (en) | Method for the anti-corrosion and cleaning pretreatment of metal components | |
| JPH04228580A (en) | Composition generating chromate conversion coating | |
| JP2005105321A (en) | Method for manufacturing surface treated steel sheet of excellent appearance, surface treated steel sheet, film-covered surface-treated steel sheet | |
| JPH03223472A (en) | Surface treating liquid and surface treatment for galvanized steel sheet | |
| CN103741128B (en) | Electro-galvanizing floor height is anti-corrosion trivalent chromium colour passivator | |
| JPS627890A (en) | Zinc or zinc alloy plated steel sheet having superior corrosion resistance, paintability and workability | |
| TWI279452B (en) | A Zn-plated steel sheet with an inorganic and organic composite plated layer excellent in corrosion resistance | |
| JP4635638B2 (en) | Phosphate-treated electrogalvanized steel sheet with excellent corrosion resistance and blackening resistance | |
| KR920010778B1 (en) | Excellant coating adhesive phosphate coating and water proof adhesive plating steel sheets and process for making |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090422 |