CN101045980A - High aluminium zinc alloy hot dip coating process for iron steel product - Google Patents
High aluminium zinc alloy hot dip coating process for iron steel product Download PDFInfo
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- CN101045980A CN101045980A CN 200710098357 CN200710098357A CN101045980A CN 101045980 A CN101045980 A CN 101045980A CN 200710098357 CN200710098357 CN 200710098357 CN 200710098357 A CN200710098357 A CN 200710098357A CN 101045980 A CN101045980 A CN 101045980A
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Abstract
The high aluminum zinc alloy hot dip coating process is suitable for surface treatment of different iron and steel products. The process includes the steps of alkali pickling, water washing, acid pickling, water washing, coating assisting treatment, stoving, hot dip coating, cooling, deactivating and others. The present invention adopts water soluble coating assistant and high aluminum zinc alloy solution, and the improved hot dip coating process has high coating quality, low cost, easy operation and controllability of coating thickness.
Description
Technical field:
The invention belongs to steel product hot dip process high aluminium zinc alloy technical field, the water-soluble fluxing agent and the high aluminium zinc alloy liquid formula that high aluminium zinc alloy hot dip coating process for iron steel product are provided especially and have been suitable for the hot dip process high aluminium zinc alloy.
Background technology:
For preventing that metallic substance in use is corroded, often adopt the hot-dip coating mode to be protected.And at present, the hot dip process processing mode on steel product surface mainly still solves by traditional pot galvanize.Though hot galvanized layer has the certain protection effect to metal base, in special environment for use such as sour environment, oceanic climate, its corrosion resisting property will variation.Simultaneously, because the price of starting material zinc ingot metal was skyrocketing in recent years, made that the pot galvanize cost is skyrocketing, and the almost not change of the price of pot galvanize product, the result causes the profit of pot galvanize enterprise significantly to glide, even some enterprise has arrived the stage that stops production or go bankrupt.
In view of the solidity to corrosion difference of above hot galvanized layer and the reason of high two aspects of production cost, hot dip aluminum plating zinc alloy technology had obtained fast development in recent years.Because the solidity to corrosion of hot-dip coating aluminium-zinc alloy both had been better than the solidity to corrosion of pot galvanize, can reduce production costs significantly again simultaneously.Such as Sendzimir method (oxidation reduction process) hot plating technology of aluminium-zinc alloy (55%Al+43.4%Zn+1.6%Si) that the U.S. Bethlehem Steel Company of technology comparative maturity invents, a plurality of at home manufacturer production are used; Also have zinc-aluminium rare earth (Zn+5%Al+Re), zinc-aluminum-magnesium rare earth hot dip process technology such as (Zn+Al+Mg+Re) also to obtain using comparatively widely.
But it should be noted that: Sendzimir method only is applicable to the big production of serialization, produces single products such as steel band and steel plate, and this technological investment height, scale is big, coating is thin partially, is not suitable for the hot dip process of all kinds of steel products of discontinuousization; And similar hot dip process technology such as zinc-aluminium rare earth, zinc-aluminum-magnesium rare earth, also only be applied to continous way single product productions such as steel wire, steel strand, and be not suitable for shape different sizes, all kinds of steel products that surface-area is bigger, and the aluminium content in its plating bath also lower (≤5%), coating is also thin partially.
Also have electrolytic activation to help plating method hot-dip coating aluminium-zinc alloy (55%Al+43.4%Zn+1.6%Si) technology and oxidation passivation to help plating method hot plating technology of aluminium-zinc alloy according to another report, but these two kinds of methods problem of various degrees all.Electrolytic activation helps plating method hot-dip coating aluminium-zinc alloy, need in helping the plating pond, add electrolyzer, this not only needs to increase investment and makes complicated operationization, and because the particular requirement of electrolyzer counter electrode material, electrode shape and different parameters such as size, current density, electrolyzer shape and size, determined electrolytic activation to help plating method hot-dip coating aluminium-zinc alloy only to be applicable to unified specification products such as section bar, standardized component, make the product simplification, accommodation is too poor.And the oxidation passivation helps plating method hot-dip coating aluminium-zinc alloy, and operation is comparatively complicated, especially pre-treatment, helps the time spent of plating and hot dip process long (wherein hot dip process with regard to consuming time more than at least 10 minutes), has had a strong impact on production efficiency; In addition and since plating piece when from passivating solution, proposing the color of adherent passivator may not can wash off fully, when hot dip process, will pollute alloy liquid and coating, and pollution level influences the apparent mass of product along with the carrying out of production can be more and more serious.
In a word, except that the present invention, up to the present also do not find to have a kind of method, can be on the basis of original sophisticated traditional hot zincincation, change a little, just can produce in the dip calorizing zinc liquid aluminium content up to 10%--60%, the adjustment of the proportioning that thickness of coating can be by plating assistant agent prescription and alloy liquid composition is controlled, and base material is the steel product hot-dip coating aluminium-zinc alloy product of size, shape arbitrarily.
Summary of the invention:
The object of the present invention is to provide a kind of high aluminium zinc alloy hot dip coating process for iron steel product, invented the water-soluble fluxing agent and the high aluminium zinc alloy liquid formula that are suitable for steel product hot dip process high aluminium zinc alloy especially.
1, high aluminium zinc alloy hot dip coating process for iron steel product flow process provided by the invention is:
Alkali cleaning-washing-pickling-wash-help plating-oven dry-hot dip process-cooling-passivation
2, the water-soluble fluxing agent that is suitable for steel product hot dip process high aluminium zinc alloy, plating assistant agent are formed (w%) and are:
Ammonium chloride 4-10%
Zinc chloride 27-33%
Rare earth chloride 0.04-0.1%
Ethylene glycol 0.4-0.8%
Water surplus
In above-mentioned 50--90 ℃ plating assistant agent, help plating 1-2 minute through the steel product after the processing such as alkali cleaning, pickling, back oven dry between 100--150 ℃ is proposed, its surface will form even, the fine and close dried solvent film of one deck, and then carries out hot dip process in the immersion fused aluminium-zinc alloy liquid.Use this plating assistant agent, workpiece must be dried after helping plating, and prevents before hot-dip coating aluminium-zinc alloy the moisture absorption once more.
3, high aluminium zinc alloy liquid proportioning (w%) is as follows:
Aluminium 10-60%
Zinc 40-90%
Silicon 0.55-1.65%
Antimony 0.03-0.1%
According to the difference of alloy liquid proportioning, the immersion plating temperature is between 470--650 ℃, and the immersion plating time is 1-3 minute.Aluminium, zinc, silicon, antimony both can add with simple substance form, also can add with the form of master alloy.
The present invention has the following advantages:
1, the corrosion resisting property of al-zn alloy coating is far above pure zinc coating, if when reaching same anti-corrosion standard-required, al-zn alloy coating thickness can reduce greatly, saves a large amount of coated metal consumptions.
2, help plating with water-soluble fluxing agent, easy and simple to handle, time saving and energy saving and cost is low, help plating effective, phenomenons such as no plating leakage, void plating.Avoided electrolytic activation to help the plating method must increase electrolyzer, investment is big, the single drawback of complicated operation and product; Avoided the Sendzimir method scale of investment to be suitable for the drawback of continuous mass production greatly and only; Avoided also that the oxidation passivation helps plating method complicated operation, the operational cycle is long, production efficiency is low and product coating and plating bath easily are passivated defectives such as agent color stain.
3, the content of aluminium is higher in the aluminium-zinc alloy liquid, considers that the specific surface area of aluminium is bigger, and the market value of aluminum current, can reduce production costs so use the higher alloy liquid hot dip process of aluminum content greatly well below the market value of zinc.
4, this technology can change a little on traditional hot dip galvanizing process basis and just can realize that facility investment is few, easy and simple to handle, material is easily got.The transition that is fit to newly-built enterprise and existing zinc-plated enterprise.
5, product surface quality is good, and is smooth bright and clean, defectives such as no plating leakage, empty plating, pin hole and aberration.
6, the good and production cost of product various aspects of performance reduces significantly, and economic benefit and social benefit are considerable, have promotional value.
Embodiment:
With the Q235 steel sample of the Q345 steel sample of 100mm * 50mm * 3mm and 100mm * 50mm * 3mm after alkali cleaning, washing, pickling, washing, immerse in the plating assistant agent as shown in table 1 and help plating, oven dry back hot dip process in aluminium-zinc alloy liquid as shown in table 2 obtains data as shown in table 3.Defectives such as the surfacing of gained plating piece, bright and clean, no plating leakage, pin hole.Corrosion resistance coating is good.
Table 1 plating assistant agent is formed
| Component | Ammonium chloride | Zinc chloride | Rare earth chloride | Ethylene glycol | Water |
| Content (w%) | 8 | 28 | 0.08 | 0.6 | Surplus |
Table 2 aluminium-zinc alloy liquid is formed
| Component | Aluminium | Silicon | Antimony | Zinc |
| Content (w%) | 40 | 1.0 | 0.05 | Surplus |
The different steel sample of table 3 experimental data
| The steel sample | Help the plating temperature (℃) | Help the plating time (min) | Hot dip temperature (℃) | The hot dip time (min) | Thickness of coating (μ m) |
| Q345 | 65 | 1.5 | 555 | 1.5 | 78 |
| Q235 | 80 | 1.2 | 565 | 2 | 95 |
Claims (3)
1, a kind of high aluminium zinc alloy hot dip coating process for iron steel product, technical process is: alkali cleaning-washing-pickling-wash-help plating-oven dry-hot dip process-operations such as cooling-passivation.It is characterized in that: in above-mentioned technology, adopt to be suitable for hot dip process high aluminium zinc alloy water-soluble fluxing agent and high aluminium zinc alloy liquid formula.
2, by the described high aluminium zinc alloy hot dip coating process for iron steel product of claim 1, the composition, weight that it is characterized in that water-soluble fluxing agent when working conditions is:
Ammonium chloride 4-10%
Zinc chloride 27-33%
Rare earth chloride 0.04-0.1%
Ethylene glycol 0.4-0.8%
Water surplus
Help 50--90 ℃ of plating temperature
Help 1-2 minute plating time
3, by the described high aluminium zinc alloy hot dip coating process for iron steel product of claim 1, it is characterized in that composition, weight ratio (adjusting according to institute's metallizing and requirement) and the working conditions of high aluminium zinc alloy liquid is:
Aluminium 10-60%
Zinc 40-90%
Silicon 0.55-1.65%
Antimony 0.03-0.1%
470-650 ℃ of immersion plating temperature
1-3 minute immersion plating time
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200710098357 CN101045980A (en) | 2007-04-23 | 2007-04-23 | High aluminium zinc alloy hot dip coating process for iron steel product |
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| CN 200710098357 CN101045980A (en) | 2007-04-23 | 2007-04-23 | High aluminium zinc alloy hot dip coating process for iron steel product |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101948991A (en) * | 2010-09-21 | 2011-01-19 | 浙江华达钢业有限公司 | Corrosion-resistant hot galvanized steel plate and preparation method thereof |
| CN101984130A (en) * | 2010-10-12 | 2011-03-09 | 中国电力科学研究院 | High corrosion-resistant hot-dip alloy coating of fastening pieces and preparation method thereof |
| CN101760717B (en) * | 2009-12-28 | 2011-09-21 | 江苏麟龙新材料股份有限公司 | Method for carrying out diffusion treatment on coating of engineering parts resistant to marine climate |
| CN102251203A (en) * | 2010-05-18 | 2011-11-23 | 海洋王照明科技股份有限公司 | Technology of hot dip aluminium-plating and application thereof |
| CN102251202A (en) * | 2010-05-18 | 2011-11-23 | 海洋王照明科技股份有限公司 | Hot dip aluminum-silicon coating technology and use thereof |
| CN102560307A (en) * | 2012-01-16 | 2012-07-11 | 周然华 | Production process of multiple aluminum zinc alloy hot-dipped on surface of carbon steel |
| CN103014797A (en) * | 2012-11-22 | 2013-04-03 | 天长市飞龙金属制品有限公司 | Surface treatment process of metal sheets |
| CN103084796A (en) * | 2012-11-22 | 2013-05-08 | 天长市飞龙金属制品有限公司 | Steel grating plate molding and surface treatment process |
| CN106521385A (en) * | 2016-11-22 | 2017-03-22 | 常州大学 | Two-step SuperDyma alloy hot dipping technology for structural steel |
| CN107937851A (en) * | 2017-11-08 | 2018-04-20 | 天津正天医疗器械有限公司 | New and effective structural member hot dip Galfan fluxing agents and preparation method and application |
| CN108395806A (en) * | 2018-03-01 | 2018-08-14 | 中山市普利斯顿化工科技有限公司 | A kind of method of steel product surface galvanizing aluminium |
| CN112410702A (en) * | 2020-11-18 | 2021-02-26 | 国网河南能源互联网电力设计院有限公司 | Plating assistant agent for Zn-Al-Mg-Re alloy and hot dip plating method thereof |
| CN113528875A (en) * | 2021-06-29 | 2021-10-22 | 海西华汇化工机械有限公司 | Method for adding alloy elements for hot galvanizing of steel |
| CN113774303A (en) * | 2021-08-14 | 2021-12-10 | 江苏神舟灯饰有限公司 | Workpiece surface treatment process |
-
2007
- 2007-04-23 CN CN 200710098357 patent/CN101045980A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101760717B (en) * | 2009-12-28 | 2011-09-21 | 江苏麟龙新材料股份有限公司 | Method for carrying out diffusion treatment on coating of engineering parts resistant to marine climate |
| CN102251203B (en) * | 2010-05-18 | 2014-03-12 | 海洋王照明科技股份有限公司 | Technology of hot dip aluminium-plating and application thereof |
| CN102251203A (en) * | 2010-05-18 | 2011-11-23 | 海洋王照明科技股份有限公司 | Technology of hot dip aluminium-plating and application thereof |
| CN102251202A (en) * | 2010-05-18 | 2011-11-23 | 海洋王照明科技股份有限公司 | Hot dip aluminum-silicon coating technology and use thereof |
| CN102251202B (en) * | 2010-05-18 | 2014-11-05 | 海洋王照明科技股份有限公司 | Hot dip aluminum-silicon coating technology and use thereof |
| CN101948991B (en) * | 2010-09-21 | 2012-12-05 | 浙江华达钢业有限公司 | Corrosion-resistant hot galvanized steel plate and preparation method thereof |
| CN101948991A (en) * | 2010-09-21 | 2011-01-19 | 浙江华达钢业有限公司 | Corrosion-resistant hot galvanized steel plate and preparation method thereof |
| CN101984130A (en) * | 2010-10-12 | 2011-03-09 | 中国电力科学研究院 | High corrosion-resistant hot-dip alloy coating of fastening pieces and preparation method thereof |
| CN102560307A (en) * | 2012-01-16 | 2012-07-11 | 周然华 | Production process of multiple aluminum zinc alloy hot-dipped on surface of carbon steel |
| CN103084796A (en) * | 2012-11-22 | 2013-05-08 | 天长市飞龙金属制品有限公司 | Steel grating plate molding and surface treatment process |
| CN103014797A (en) * | 2012-11-22 | 2013-04-03 | 天长市飞龙金属制品有限公司 | Surface treatment process of metal sheets |
| CN103084796B (en) * | 2012-11-22 | 2016-01-27 | 天长市飞龙金属制品有限公司 | Shaping and the process of surface treatment of a kind of steel grating |
| CN106521385A (en) * | 2016-11-22 | 2017-03-22 | 常州大学 | Two-step SuperDyma alloy hot dipping technology for structural steel |
| CN107937851A (en) * | 2017-11-08 | 2018-04-20 | 天津正天医疗器械有限公司 | New and effective structural member hot dip Galfan fluxing agents and preparation method and application |
| CN108395806A (en) * | 2018-03-01 | 2018-08-14 | 中山市普利斯顿化工科技有限公司 | A kind of method of steel product surface galvanizing aluminium |
| CN112410702A (en) * | 2020-11-18 | 2021-02-26 | 国网河南能源互联网电力设计院有限公司 | Plating assistant agent for Zn-Al-Mg-Re alloy and hot dip plating method thereof |
| CN113528875A (en) * | 2021-06-29 | 2021-10-22 | 海西华汇化工机械有限公司 | Method for adding alloy elements for hot galvanizing of steel |
| CN113774303A (en) * | 2021-08-14 | 2021-12-10 | 江苏神舟灯饰有限公司 | Workpiece surface treatment process |
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