CN101570842A - Method for hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel - Google Patents
Method for hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel Download PDFInfo
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- CN101570842A CN101570842A CNA200910039815XA CN200910039815A CN101570842A CN 101570842 A CN101570842 A CN 101570842A CN A200910039815X A CNA200910039815X A CN A200910039815XA CN 200910039815 A CN200910039815 A CN 200910039815A CN 101570842 A CN101570842 A CN 101570842A
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Abstract
The invention discloses a method for hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel, which performs batch hot dip galvanizing on the rolled steel in a zinc alloy plating bath prepared from two binary intermediate alloys. The zinc alloy plating bath comprises the following components by weight percentage: 0.03 to 0.05 percent of nickel, 0.03 to 0.08 percent of vanadium, and the balance of zinc. The two binary intermediate alloys comprise the following components by weight percentage: 2 to 3 percent of the nickel in a zinc-nickel binary intermediate alloy, and the balance of zinc; and 1 to 2 percent of vanadium in a zinc-vanadium binary intermediate alloy, and the balance of the zinc. The alloy plating coat has a simple process, the components of the alloy zinc plating bath are easy to control, adverse effects on the plating coat caused by silicon in the steel for the hot dip galvanizing can be overcome effectively, the thickness of the plating coat is reduced effectively, and simultaneously, the corrosion resistance and the antioxygenic property of the plating coat is further improved and the prior hot dip galvanizing equipment is not necessary to be changed, thus the method is advantageous for the large-scale production of the batch hot dip galvanizing of the rolled steel.
Description
Technical field
The invention belongs to thermal dip plating of steel zinc alloy technical field.The method that particularly relates to a kind of hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel.
Background technology
Galvanizing is widely used in fields such as electric power, traffic, building as a kind of economy of steel material surface protection and effective means.Owing in steelmaking process, add silicon usually as reductor, therefore, the steel that is used for galvanizing at present in a large number mostly is higher killed steel of silicon content and semikilled steel (being called active steel).The existence of silicon can influence in the coating each growth of layer mutually in the steel, and the phenomenon of gloomy, super thick, poor adhesion often appears in coating, and quality of coating is reduced greatly.In order to improve the quality of pot galvanize product, and reduce production costs, the nineties in 20th century, domestic launched many about the alloy for hot-dip Study on Technology.Studies show that of admiro, in bathing, zinc adds 0.04%～0.12%Ni, can improve the flowability of zinc liquid and the light of coating, also solve simultaneously the super thick and problem of poor adhesion of coating that Si killed steel occurs preferably, and be widely used in production practice.In industrial application, generally select the composition of Zn-0.05%Ni, the alloy plating bath of this composition can suppress the reaction of iron zinc, and effectively attenuate coating can be avoided again generating Γ at coating surface
2The phase particle, thus quality of coating improved, and its weak point is that solidity to corrosion improves not quite.
Become increasingly complex along with the Service Environment of steel products becomes, etching problem is becoming increasingly acute.The etching problem of material not only comprises the normal temperature corrosion, also comprises high temperature corrosion.Some coating is applied under the higher temperature environment, is subject to the destruction of high temperature oxidation and corrosion, thereby requires coating to have the certain high temperature antioxidant property.
Summary of the invention
The object of the present invention is to provide a kind of zinc of effectively controlling to bathe composition, can solve that silicon can improve the method for the hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel of zinc coating corrosion resisting property and antioxidant property again to the disadvantageous effect of galvanizing layer quality in the steel.
For reaching above-mentioned purpose, the present invention adopts following technical scheme.
A kind of method of hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel comprises the steps and processing condition:
(1) binary master alloy refining: take by weighing zinc, nickel and vanadium in the binary master alloy raw material by weight proportion, zinc, nickel and zinc, vanadium are placed plumbago crucible respectively, respectively refining; Wherein, in the zinc-nickel binary master alloy raw material, the nickel weight content was 2%～3%, and all the other are zinc, and the smelting temperature of zinc-nickel master alloy is 600～620 ℃, 600～620 ℃ of insulations 3～4 hours; In the almagrerite binary master alloy raw material, the vanadium weight content was 1%～2%, and all the other are zinc, and the smelting temperature of almagrerite master alloy is 710～730 ℃, 710～730 ℃ of insulations 3～4 hours; Master alloy liquid after the insulation pours into zinc-nickel and almagrerite intermediate alloy ingot respectively then through stirring, leaving standstill and remove the lime-ash on alloy liquid surface;
(2) zinc is bathed into assignment system: with the zinc in zinc pot fusing and maintain the temperature at 445～455 ℃, add zinc-nickel and almagrerite intermediate alloy ingot again, making zinc nickeliferous in bathing is 0.03%～0.05% (weight), and containing vanadium is 0.03%～0.08% (weight);
(3) pre-treatment: steel are carried out oil removing, eliminate rust, help plating and oven dry pre-treatment;
(4) galvanizing: be under 445～455 ℃ the condition, steel to be carried out batch quantity hot dipping zinc 3～10 minutes in the zinc of step (2) gained is bathed in temperature;
For further realizing goal of the invention, also comprise the detection and the adjustment of zinc bath composition behind described step (4) galvanizing: detect nickel and content of vanadium in the zinc bath every day, in zinc is bathed nickel or content of vanadium be lower than former content 80% the time, add zinc-nickel or almagrerite master alloy, to keep the stable components that alloy zinc is bathed.
Described detection is to adopt colorimetry to detect alloy zinc to bathe composition.
Described pre-treatment is under 60～70 ℃ of temperature condition, in 5～6% (weight) NaOH aqueous solution steel is carried out the alkali cleaning oil removing; With 50～60 ℃ of clear water of temperature steel are washed; In temperature is among 15～20% (weight) HCl steel to be carried out acid pickling and rust removing under 20～30 ℃ of conditions; Clear water with 20～30 ℃ is washed steel again; In temperature 70% (weight) NH of 80～90 ℃
4Cl and 30% (weight) ZnCl
2In the mixed aqueous solution plating assistant agent steel are helped plating, help 2～3 minutes plating time; In temperature is under 110～130 ℃ of conditions steel to be dried, and the time is 2～5 minutes.
With respect to prior art, the invention has the beneficial effects as follows: bathe composition detection by regular zinc, take to add respectively the mode of binary master alloy, solve the different problem of each alloying element spending rate in the zinc bath, make alloy zinc bathe easy control of components; Can effectively suppress the super length of improving people's living condition of coating of siliceous active steel, improve the coating corrosion resistance nature, delay the generation of white rust by a relatively large margin, improve the antioxidant property of coating simultaneously, make the coating oxidation weight gain reduce; Technology is simple, need not to change original hot-dip galvanizing device, helps the batch quantity hot dipping zinc of rolled steel large-scale production.
Description of drawings
Fig. 1 is the histogram of the thickness of coating that contains that the 0.10%Si steel is bathed at 450 ℃ of pure Zn respectively, obtain behind the hot dip process 5min in Zn-0.05%Ni alloy baths and the Zn-0.05%Ni-0.05%V alloy baths.
Fig. 2 is the pure Zn of hot dip process, Zn-0.05%Ni and the Zn-0.05%Ni-0.05%V coating histogram in 5%NaCl salt air corrosion coating white rust area coverage after 8 hours.
Fig. 3 is that the pure Zn of hot dip process, Zn-0.05%Ni and Zn-0.05%Ni-0.05%V coating carry out the oxidation kinetics curve that the oxidation weight gain experiment is obtained in box-type furnace.
Fig. 4 is the pure Zn of hot dip process, Zn-0.05%Ni and the polarization curve of Zn-0.05%Ni-0.05%V coating in 5%NaCl solution.
Embodiment
The invention will be further described below in conjunction with drawings and Examples, but the scope of protection of present invention is not limited to the scope that embodiment represents.
Among the following embodiment, remove and specify that % represents weight percent.
Zinc-plated with steel for containing the 0.10%Si steel plate, dimensions is 50mm * 40mm * 3mm, chemical ingredients is seen following table 1.The method of its hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel comprises the steps and processing condition:
(1) binary master alloy refining: take by weighing nickel and zinc and vanadium and zinc by weight proportion, nickel and zinc are placed a plumbago crucible, vanadium and zinc are placed another plumbago crucible, respectively refining.Wherein, the nickel weight content in the zinc-nickel binary master alloy raw material is 2%, and the smelting temperature of zinc-nickel master alloy is 600 ℃, is incubated 3 hours down at 600 ℃; Vanadium weight content in the almagrerite binary master alloy raw material is 1.6%, and the smelting temperature of almagrerite master alloy is 720 ℃, and insulation is 3.5 hours under this temperature.Master alloy liquid after the insulation pours into zinc-nickel intermediate alloy ingot and almagrerite intermediate alloy ingot respectively then through stirring, leaving standstill and remove the lime-ash on alloy liquid surface.
(2) zinc is bathed into assignment system: with the zinc in zinc pot fusing and maintain the temperature at 450 ℃, add step (1) gained zinc-nickel intermediate alloy ingot and almagrerite intermediate alloy ingot again, obtain nickeliferous 0.05%, as to contain vanadium 0.05% zinc and bathe.
(3) pre-treatment: steel are carried out oil removing, eliminate rust, help plating and oven dry pre-treatment; Specifically be that (a) carries out the alkali cleaning oil removing to steel in the 5%NaOH aqueous solution (60 ℃); (b) with 50 ℃ of clear water of temperature steel are washed; (c) in 15%HCl (25 ℃ of room temperatures), steel are carried out acid pickling and rust removing; (d) with 25 ℃ of clear water of room temperature steel are washed again; (e) in temperature be 80 ℃ 70%NH
4Cl and 30%ZnCl
2In the mixed aqueous solution plating assistant agent steel are helped plating, help 2 minutes plating time; (f) under 120 ℃ of temperature, steel are dried 3 minutes time.
(4) galvanizing: in the alloy zinc of 450 ℃ of the temperature of step (2) gained is bathed, steel are carried out galvanizing, 5 minutes time.
Also comprise the detection and the adjustment of zinc bath composition behind step (4) galvanizing.Production period detect every day an alloy zinc bathe in nickel or content of vanadium, in zinc is bathed nickel or vanadium weight content be lower than former content 80% the time, add zinc-nickel or almagrerite master alloy, to keep the stable components that alloy zinc is bathed.Its detection is to adopt colorimetry to detect alloy zinc to bathe composition.
The chemical ingredients of table 1 experiment usefulness steel (massfraction, %)
5 minutes the test of hot dip process in the alloy zinc of 450 ℃ of pure zinc baths and nickeliferous 0.05% is bathed respectively of 0.10%Si steel plate will be contained among the embodiment 1.Pre-treatment step and hot-dip galvanizing technique condition are identical with embodiment 1.
Steel plate galvanized to embodiment 1 and contrast test 1 carries out the thickness of coating test, the off-saw size specification is 50mm * 40mm * 3mm sample from the steel plate galvanized, its cross section is ground, polishes, corrodes, under metaloscope with having graduated eyepiece, the thickness of coating in the measure sample.Three kinds of zinc-plated results as shown in Figure 1, in pure zinc is bathed, add nickel as can be seen after, played the effect of attenuate coating, add vanadium again after, can further reduce thickness of coating.
Estimate the coating corrosion resistance nature with the salt spray corrosion test method, YWX/Q-150 type salt fog cabinet is adopted in test, with reference to the ISO-3768 standard, etchant solution is the 5%NaCl aqueous solution, the pH value of solution is 6.5～7.2, and salt fog the temperature inside the box is 35 ± 2 ℃, and the size of spray amount is 1～2mL/ (80cm
2H).The result as shown in Figure 2, Zn-0.05%Ni-0.05%V alloy layer (embodiment 1) can delay the generation of white rust by a relatively large margin as can be seen, corrosion resistance nature obviously improves.
With the antioxidant property of cyclic oxidation weightening finish experimental evaluation coating, 9X is adopted in test
2-410 type box-type furnaces, oxidizing temperature are 350 ℃, and oxidization time is 150h, and every oxidation 10h takes out sample air cooling 40min, and adopting precision is 10
-4The scales/electronic balance weighing of g is drawn the oxidation kinetics curve according to the oxidation weight gain situation.The result as shown in Figure 3, Zn-0.05%Ni-0.05%V alloy layer (embodiment 1) oxidation weight gain is slow as can be seen, antioxidant property obviously improves.
Electro-chemical test: sample to be tested is carried out sealing wax, in the middle of sample, reserve the coating surface of 10mm * 10mm.It is in 5% the NaCl solution that sample to be tested is immersed massfraction, the CHI604B type electrochemical workstation that uses Shanghai occasion China instrument company to produce carries out electro-chemical test, adopt conventional three-electrode system, working electrode is a coating to be measured, supporting electrode is a platinum electrode, and reference electrode is a saturated calomel electrode, measures open circuit potential earlier, measure the polarization curve of coating then, the potential scanning speed of polarization curve is 0.1mV/s.The electrochemical tests of coating more as shown in Figure 4, table 2 is corresponding electrochemical polarization parameter.From Fig. 4 and table 2 as can be seen, zinc makes coating after bathing and adding nickel, vanadium alloy element
Table 2 galvanizing and zn alloy coating electrochemical polarization parameter
The corrosion potential E on surface
CorrImprove polarization resistance R
pIncrease corrosion electric current density J
CorrReduce.Wherein the effect of Zn-0.05%Ni-0.05%V alloy layer is more remarkable.It is littler than pure zinc coating that spontaneous corrosive tendency takes place in 5%NaCl solution the Zn-0.05%Ni-0.05%V alloy layer that shows embodiment 1 gained, and alloying element is inhibited to the galvanic corrosion of zinc coating.
Zinc-plated is that Q235 contains (0.22%Si) steel plate with steel, and dimensions is 50mm * 40mm * 3mm, and the method for employing comprises the steps and processing condition:
(1) binary master alloy refining: take by weighing nickel and zinc and vanadium and zinc by weight proportion, nickel and zinc are placed a plumbago crucible, vanadium and zinc are placed another plumbago crucible, respectively refining.Wherein, the nickel content in the zinc-nickel binary master alloy raw material is 2.4%, and the smelting temperature of zinc-nickel master alloy is 610 ℃, and insulation is 3.5 hours under this temperature; Content of vanadium in the almagrerite binary master alloy raw material is 1%, and the smelting temperature of almagrerite master alloy is 710 ℃, and insulation is 4 hours under this temperature.Master alloy liquid after the insulation pours into zinc-nickel intermediate alloy ingot and almagrerite intermediate alloy ingot respectively then through stirring, leaving standstill and remove the lime-ash on alloy liquid surface.
(2) zinc is bathed into assignment system: with the zinc in zinc pot fusing and maintain the temperature at 445 ℃, add step (1) gained zinc-nickel intermediate alloy ingot and almagrerite intermediate alloy ingot again, obtain nickeliferous 0.03%, as to contain vanadium 0.03% zinc and bathe.
(3) pre-treatment: steel are carried out oil removing, eliminate rust, help plating and oven dry pre-treatment; Specifically be that (a) carries out the alkali cleaning oil removing to steel in the 5.5%NaOH aqueous solution (65 ℃); (b) with 55 ℃ of clear water of temperature steel are washed; (c) in 17%HCl (25 ℃ of room temperatures), steel are carried out acid pickling and rust removing; (d) with 25 ℃ of clear water of room temperature steel are washed again; (e) in temperature be 85 ℃ 70wt%NH
4Cl+30wt%ZnCl
2In the aqueous solution plating assistant agent steel are helped plating, help 2 minutes plating time; (f) under 110 ℃ of temperature, steel are dried 2 minutes time.
(4) galvanizing: in the alloy zinc of 455 ℃ of temperature is bathed, steel are carried out galvanizing, 3 minutes time.
Comprise also behind step (4) galvanizing that zinc bathes the detection and the adjustment of composition: production period detect every day an alloy zinc bathe in nickel or content of vanadium, in zinc is bathed nickel and content of vanadium be lower than former content 80% the time, add zinc-nickel or almagrerite master alloy, to keep the stable components that alloy zinc is bathed.Its detection is to adopt colorimetry to detect alloy zinc to bathe composition.
Zinc-plated is Q235 (containing 0.22%Si) steel plate with steel, and dimensions is 50mm * 40mm * 3mm, and the method for employing comprises the steps and processing condition:
(1) binary master alloy refining: take by weighing nickel and zinc and vanadium and zinc by weight proportion, nickel and zinc are placed a plumbago crucible, vanadium and zinc are placed another plumbago crucible, respectively refining.Wherein: the nickel content in the zinc-nickel binary master alloy raw material is 3%, and the smelting temperature of zinc-nickel master alloy is 620 ℃, and insulation is 4 hours under this temperature; Content of vanadium in the almagrerite binary master alloy raw material is 2%, and the smelting temperature of almagrerite master alloy is 730 ℃, and insulation is 3 hours under this temperature.Master alloy liquid after the insulation pours into zinc-nickel intermediate alloy ingot and almagrerite intermediate alloy ingot respectively then through stirring, leaving standstill and remove the lime-ash on alloy liquid surface.
(2) zinc is bathed into assignment system: with the zinc in zinc pot fusing and maintain the temperature at 445 ℃, add step (1) gained zinc-nickel intermediate alloy ingot and almagrerite intermediate alloy ingot again, obtain nickeliferous 0.04%, as to contain vanadium 0.08% zinc and bathe.
(3) pre-treatment: steel are carried out oil removing, eliminate rust, help plating and oven dry pre-treatment; Specifically be that (a) carries out the alkali cleaning oil removing to steel in the 6%NaOH aqueous solution (70 ℃); (b) with 60 ℃ of clear water of temperature steel are washed; (c) in 20%HCl (25 ℃ of room temperatures), steel are carried out acid pickling and rust removing; (d) with 25 ℃ of clear water of room temperature steel are washed again; (e) in temperature be 90 ℃ 70wt%NH
4Cl+30wt%ZnCl
2In the aqueous solution plating assistant agent steel are helped plating, help 3 minutes plating time; (f) under 125 ℃ of temperature, steel are dried 5 minutes time.
(4) galvanizing: in the alloy zinc of 445 ℃ of temperature is bathed, steel are carried out galvanizing, 10 minutes time.
Comprise also behind step (4) galvanizing that zinc bathes the detection and the adjustment of composition: production period detect every day an alloy zinc bathe in nickel or content of vanadium, in zinc is bathed nickel or vanadium weight content be lower than former content 80% the time, add zinc-nickel or almagrerite master alloy, to keep the stable components that alloy zinc is bathed.Its detection is to adopt colorimetry to detect alloy zinc to bathe composition.
Steel plate galvanized to embodiment 2 and embodiment 3 carries out the thickness of coating test, the off-saw size specification is 50mm * 40mm * 3mm from the steel plate galvanized, its cross section is ground, polishes, corrodes, under metaloscope with having graduated eyepiece, the thickness of coating in the measure sample.The results are shown in Table shown in 2.The thickness of coating observed value of comprehensive embodiment 1～3, as can be seen, during hot dip process, coating is thicker in pure zinc is bathed for the steel of different silicon-containing amount, in zinc is bathed, add nickel, vanadium after, reduced thickness of coating effectively.
Estimate the coating corrosion resistance nature with the salt spray corrosion test method, YWX/Q-150 type salt fog cabinet is adopted in test, with reference to the ISO-3768 standard, etchant solution is the 5%NaCl aqueous solution, the pH value of solution is 6.5～7.2, and salt fog the temperature inside the box is 35 ± 2 ℃, and the size of spray amount is 1～2mL/ (80cm
2H).The generation of the white rust of each coating the results are shown in Table 2, as can be seen, behind adding 0.03-0.05% nickel, 0.03%～0.08% vanadium, can delay the generation of white rust by a relatively large margin in zinc is bathed, and corrosion resistance nature obviously improves.
Table 2 embodiment 1～3 galvanizing layer thickness and corrosion data
Claims (4)
1, a kind of method of hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel is characterized in that comprising the steps and processing condition:
(1) binary master alloy refining: take by weighing zinc, nickel and vanadium in the binary master alloy raw material by weight proportion, zinc, nickel and zinc, vanadium are placed plumbago crucible respectively, respectively refining; Wherein, in the zinc-nickel binary master alloy raw material, the nickel weight content was 2%～3%, and all the other are zinc, and the smelting temperature of zinc-nickel master alloy is 600～620 ℃, 600～620 ℃ of insulations 3～4 hours; In the almagrerite binary master alloy raw material, the vanadium weight content was 1%～2%, and all the other are zinc, and the smelting temperature of almagrerite master alloy is 710～730 ℃, 710～730 ℃ of insulations 3～4 hours; Master alloy liquid after the insulation pours into zinc-nickel and almagrerite intermediate alloy ingot respectively then through stirring, leaving standstill and remove the lime-ash on alloy liquid surface;
(2) zinc is bathed into assignment system: with the zinc in zinc pot fusing and maintain the temperature at 445～455 ℃, add zinc-nickel and almagrerite intermediate alloy ingot again, making zinc nickeliferous in bathing is 0.03%～0.05% (weight), and containing vanadium is 0.03%～0.08% (weight);
(3) pre-treatment: steel are carried out oil removing, eliminate rust, help plating and oven dry pre-treatment;
(4) galvanizing: be under 445～455 ℃ the condition, steel to be carried out batch quantity hot dipping zinc 3～10 minutes in the zinc of step (2) gained is bathed in temperature;
2, the method for hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel according to claim 1, it is characterized in that also comprising behind described step (4) galvanizing that zinc bathes the detection and the adjustment of composition: detect every day a zinc bathe in nickel and content of vanadium, in zinc is bathed nickel or content of vanadium be lower than former content 80% the time, add zinc-nickel or almagrerite master alloy, to keep the stable components that alloy zinc is bathed.
3, the method for hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel according to claim 2 is characterized in that described detection is to adopt colorimetry to detect alloy zinc to bathe composition.
4, the method for hot dip galvanizing of nickel-vanadium alloy plating coat on rolled steel according to claim 1 is characterized in that described pre-treatment is under 60～70 ℃ of temperature condition, in 5～6% (weight) NaOH aqueous solution steel is carried out the alkali cleaning oil removing; With 50～60 ℃ of clear water of temperature steel are washed; In temperature is among 15～20% (weight) HCl steel to be carried out acid pickling and rust removing under 20～30 ℃ of conditions; Clear water with 20～30 ℃ is washed steel again; In temperature 70% (weight) NH of 80～90 ℃
4Cl and 30% (weight) ZnCl
2In the mixed aqueous solution plating assistant agent steel are helped plating, help 2～3 minutes plating time; In temperature is under 110～130 ℃ of conditions steel to be dried, and the time is 2～5 minutes.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102997852A (en) * | 2012-11-14 | 2013-03-27 | 彩虹（张家港）平板显示有限公司 | Glass baseplate bonding line measuring method |
| US20140167453A1 (en) * | 2012-12-17 | 2014-06-19 | GM Global Technology Operations LLC | Vehicle body and method for manufacturing a molded part |
| CN103981474A (en) * | 2014-05-13 | 2014-08-13 | 国家电网公司 | Highly anti-corrosion zinc-based alloy plating used for solvent method hot dipping of steel |
| CN104630682A (en) * | 2015-01-23 | 2015-05-20 | 上海大学 | Method for refining hot-dipping coating material by employing laser heat treatment |
| CN105628689A (en) * | 2015-12-11 | 2016-06-01 | 贵州红林机械有限公司 | Method for measuring nickel content in Zn-Ni alloy coating |
| CN105714230A (en) * | 2016-04-13 | 2016-06-29 | 苏州大学 | Method for obtaining nickel zirconium alloy plating by performing hot-dip galvanizing of rolled steel |
| CN108504856A (en) * | 2018-05-09 | 2018-09-07 | 大连威尔特钢有限公司 | A kind of resistance to high temperature oxidation mould steel smelting process |
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2009
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997852A (en) * | 2012-11-14 | 2013-03-27 | 彩虹（张家港）平板显示有限公司 | Glass baseplate bonding line measuring method |
| US20140167453A1 (en) * | 2012-12-17 | 2014-06-19 | GM Global Technology Operations LLC | Vehicle body and method for manufacturing a molded part |
| CN103981474A (en) * | 2014-05-13 | 2014-08-13 | 国家电网公司 | Highly anti-corrosion zinc-based alloy plating used for solvent method hot dipping of steel |
| CN103981474B (en) * | 2014-05-13 | 2017-07-21 | 国家电网公司 | A kind of high anticorrosive zinc base alloy layer for steel solvent method hot-dip |
| CN104630682A (en) * | 2015-01-23 | 2015-05-20 | 上海大学 | Method for refining hot-dipping coating material by employing laser heat treatment |
| CN105628689A (en) * | 2015-12-11 | 2016-06-01 | 贵州红林机械有限公司 | Method for measuring nickel content in Zn-Ni alloy coating |
| CN105714230A (en) * | 2016-04-13 | 2016-06-29 | 苏州大学 | Method for obtaining nickel zirconium alloy plating by performing hot-dip galvanizing of rolled steel |
| CN108504856A (en) * | 2018-05-09 | 2018-09-07 | 大连威尔特钢有限公司 | A kind of resistance to high temperature oxidation mould steel smelting process |
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