CN1258615C - Liquid zinc erosion-resistant coating - Google Patents
Liquid zinc erosion-resistant coating Download PDFInfo
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- CN1258615C CN1258615C CN 02155185 CN02155185A CN1258615C CN 1258615 C CN1258615 C CN 1258615C CN 02155185 CN02155185 CN 02155185 CN 02155185 A CN02155185 A CN 02155185A CN 1258615 C CN1258615 C CN 1258615C
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- layer
- ceramic material
- oxide ceramic
- coating
- liquid zinc
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Abstract
The present invention relates to a liquid zinc erosion-resistant coating, particularly to a coating for preventing galvanizing equipment or a component which is operated in liquid zinc from being eroded by the liquid zinc when the surface made of steel material is hotly galvanized. The coating is formed by orderly compounding a Fe-Al layer, a mixed layer of Fe-Al and oxide ceramic material and an oxide ceramic material layer, wherein in the mixed layer of the Fe-Al and oxide ceramic material, the content of the oxide ceramic material is in continuous gradient change from 0 to 100% in the direction from the surface which is in contact with the Fe-Al layer to the surface which is in contact with the oxide ceramic material layer. The Fe-Al layer can be made from one or multiple kinds of FeAl3, Fe2Al3, FeAl and Fe3Al. the oxide ceramic material layer can be made from Al2O3-(2-20)TiO2 or Cr2O3. After the liquid zinc erosion-resistant coating is used, the state of the surface of a part in a galvanizing bath is good, and the coating layer is not desquamated from the surface of the part.
Description
Technical field
The present invention relates to a kind of tolerance of liquid zinc etching resist, particularly a kind of being used for when the steel material surface pot galvanize, galvanizing equipment or other parts that protection is operated in the liquid Zn are not subjected to liquid Zn erosive coating.
Background technology
Sinking roller in the continuous zinc coating groove places high-temperature liquid state zinc, rotates under the driving of steel plate, plays guide effect, makes steel plate produce turning to of nearly 360 degree, and steel plate is around the transmission of sinking roller.There are two supporting rolls also to be operated in the liquid Zn trend of steel sheet on sinking roller top.In order to reduce the corrosion of steel rider, sink usually roller and supporting roll are made by the SUS316L stainless steel.Facts have proved, even if the steel rider that constitutes by such material also with liquid Zn generation alloying reaction, corroded by liquid Zn.When steel roller faces is corroded by liquid Zn, after perhaps cadmia was adsorbed onto steel roller faces, it is uneven that steel roller faces becomes, and directly influences the steel plate galvanizing quality.In order to protect steel roller faces not to be subjected to the erosion of liquid Zn, JP8104966 is mentioned to cobalt tungsten carbide powder powder material is sprayed to steel roller faces with heat spraying method, has improved the anti-liquid Zn erosional competency of steel rider.The anti-liquid Zn erosional competency of cobalt tungsten carbide coating depends on there is form, is subjected to the influence of spraying method and powder manufacturing process of cobalt in the coating, and the anti-liquid Zn ability of some cobalt tungsten carbide coating is not as good as the SUS316L stainless steel.The cost of cobalt tungsten carbide powder powder material is also than higher in addition.There is document also to propose,, contains pore more than 3% with the ceramic coating of heat spraying method formation although do not react substantially with liquid Zn from the oxide-based pottery of the performance of material with chromic oxide class stupalith spraying steel rider.Because the surface tension of liquid Zn is very low, is easy to be penetrated into coating or passes coating penetration, the corrosion steel roller faces to steel roller faces, make coating shedding, when oxide ceramics used separately in addition, steel rider was subjected to thermal shocking, coating might come off, so oxide ceramics should not use separately.The boride of some metal and nitride also have anti-liquid Zn ability, for example EP603797 proposes MoSi, CrSi, MoB etc., but these materials at high temperature decompose easily, and perhaps fusing point is higher, are difficult to form fine and close coating with traditional detonation flame spraying or supersonic spray coating method.
Summary of the invention
In view of this, the objective of the invention is to, a kind of tolerance of liquid zinc etching resist is provided, be subjected to the technical problem of paying of liquid zinc corrosion or other metal objects with the piece surface in the solution zinc bath.
Technical scheme of the present invention is as follows: a kind of tolerance of liquid zinc etching resist, and successively by the Fe-Al layer, three layers of compound composition of Fe-Al and oxide ceramic material mixolimnion and oxide ceramic material layer, Fe-Al layer thickness wherein is 0.05-0.5mm.
In described Fe-Al and the oxide ceramic material mixolimnion, the content of oxide ceramic material from the surface that contacts with the Fe-Al layer to surface direction that the oxide ceramic material layer contacts on, be that 0 to 100% continuous gradient changes.
Described Fe-Al layer can be FeAl
3, Fe
2Al
3, FeAl and Fe
3A kind of among the Al or several.
Described oxide ceramic material layer can be Al
2O
3-(2-20) TiO
2Or Cr
2O
3
The intermetallic compound that Fe-Al forms has good anti-zinc erosional competency, the structure that its anti-zinc ability derives from the intermetallic compound that Fe-Al forms seldom can be dissolved in zinc, find that by thermal analysis test the solubleness of the intermetallic compound that zinc is formed at Fe-Al is less than 0.2% in addition, be that the intermetallic compound that Fe-Al forms has good anti-zinc ability, and increase along with aluminium content, anti-zinc ability also increases, and anti-zinc corrosive power is FeAl in proper order
3, Fe
2Al
3, FeAl, Fe
3Al, along with the increase of aluminium content, the fragility of material also increases on the contrary.Because the fusing point of the intermetallic compound that Fe-Al forms is lower than 1200 degree, forms coating than being easier to heat spraying method, the coating density height that forms of HVOF and detonation flame spraying method particularly also can be resisted liquid Zn not using under other sealing materials.
Though having good anti-zinc, the intermetallic compound that Fe-Al forms corrodes energy, but it is low in the degree of wetting of liquid Zn, when using separately as coating, form the metallic compound of hard easily on the intermetallic compound surface that Fe-Al forms, make steel roller faces uneven, influence the surface quality of steel plate galvanized, the hot hardness of main is Fe-Al intermetallic compound is lower, and the wear resistance when using separately is far below the cobalt-based wolfram varbide.
Therefore, as bottom, continue the spraying oxide ceramics on Fe-Al intermetallic compound surface at steel roller faces spraying Fe-Al intermetallic compound then.The Fe-Al intermetallic compound mainly act as the low layer of erosion of opposing liquid Zn and oxide ceramics, oxide ceramics is because low with liquid Zn avidity, and has good high temperature wear resistant, the combination of two kinds of materials, make the existing anti-liquid Zn erosional competency of coating, certain wear resistance is arranged again, should satisfy the need of work of part, but because the coefficient of expansion of Fe-Al intermetallic compounds layer and oxide ceramic layer differs bigger, so coming off tiny crack appears and took place in roll surface in actual use, and between these two kinds of coatings, add the mixture middle layer that one deck is made up of Fe-Al and oxide ceramics again, just can avoid the coating stress concentrations and produce tiny crack.The thickness in middle layer should be controlled between the 0.05-0.1mm, the content of oxide ceramic material from the surface that contacts with the Fe-Al layer to surface direction that the oxide ceramic material layer contacts on, be that 0 to 100% continuous gradient changes.Material as the oxide ceramics first-selection is Al
2O
3-(2-20) TiO
2, Cr2O
3, such material has stronger high temperature resistance impact, simultaneously higher hardness is arranged again, and its thickness generally also is controlled between the 0.05-0.1mm.
After adopting above-mentioned tolerance of liquid zinc etching resist, the piece surface in the zinc bath is in good condition, and coating does not come off from piece surface.
Description of drawings
Fig. 1 is Fe-Al layer coat-thickness of the present invention and liquid zinc corrosion resistant time chart.
Embodiment
Because the intermetallic compound that Fe-Al forms is a kind of hard brittle material, blocked up coating causes easily and form crackle and accelerated corrosion on coating, thus the thickness of coating at 0.05-0.5mm for suitable, best coat-thickness is 0.15-0.3mm, as shown in Figure 1.
Embodiment 1
With the sinking roller in the continuous zinc coating groove is example.Choose diameter 800mm, long 2000mm sinking roller, high-speed flame (HVOF) spraying FeAl intermetallic compound is as bottom, and this layer thickness is 0.12mm; Plasma spraying FeAl and Cr then
2O
3Mixture is as the middle layer, in this layer, and Cr
2O
3Content from the outmost surface that the surface that contacts with the FeAl layer sprays to the middle layer, be that 0 to 100% continuous gradient changes, this layer thickness 0.05mm; Last plasma spraying Cr
2O
3As top layer, this layer thickness is 0.05mm.
In the practical application, the roller that should sink places 480 degree liquid Zn, and the actual production line moved for 3 weeks, and coating is reactionless, and sinking roller surface condition is good, and coating does not break away from the sinking roller body.
Embodiment 2
With the sinking roller in the continuous zinc coating groove is example.Choose diameter 800mm, long 2000mm sinking roller, high-speed flame (HVOF) spraying FeAl intermetallic compound is as bottom, and this layer thickness is 0.12mm; Plasma spraying FeAl and Al then
2O
3+ 2.5TiO
2Mixture is as the middle layer, in this layer, and Cr
2O
3Content from the outmost surface that the surface that contacts with the FeAl layer sprays to the middle layer, be that 0 to 100% continuous gradient changes, this layer thickness 0.05mm; Last plasma spraying Al
2O
3+ 2.5TiO
2As top layer, this layer thickness is 0.05mm.
In the practical application, the roller that should sink places 480 degree liquid Zn, and the actual production line moved for 3 weeks, and coating is reactionless, and sinking roller surface condition is good, and coating does not break away from the sinking roller body.
Above two embodiment and the former coating of taking are compared, obtain following test comparison sheet:
Zinc erosion test comparison sheet
| Spray material | Test conditions | Test period | The result | Remarks | ||
| Low layer | The middle layer | Top layer | The temperature composition | |||
| WC-12Co | 480 pure zinc | 24h | Coating and zinc reaction | Comparative example | ||
| Al 2O 3 +2.5TiO 2 | 480 pure zinc | 48 | Liquid Zn sees through coating and matrix reaction | Comparative example | ||
| WC-12Co | Cr 2O 3 | 480 pure zinc | 48 | Coating and zinc reaction | Comparative example | |
| FeAl | Cr 2O 3 | 480 pure zinc | 100 | Coating has microfracture | Comparative example | |
| FeAl | Al 2O 3+2.5TiO 2 | 480 pure zinc | 100 | Coating has microfracture | Comparative example | |
| FeAl | FeAl+Cr 2O 3 | Cr 2O 3 | 480 pure zinc | 100 | Coating is reactionless | The present invention |
| FeAl | FeAl+ (Al 2O 3+2.5TiO 2) | Al 2O 3+2.5TiO 2 | 480 pure zinc | 100 | Coating is reactionless | The present invention |
Claims (7)
1. a tolerance of liquid zinc etching resist is characterized in that, successively by the Fe-Al layer, and three layers of compound composition of Fe-Al and oxide ceramic material mixolimnion and oxide ceramic material layer, Fe-Al layer thickness wherein is 0.05-0.5mm.
2. tolerance of liquid zinc etching resist as claimed in claim 1, it is characterized in that, in described Fe-Al and the oxide ceramic material mixolimnion, the content of oxide ceramic material from the surface that contacts with the Fe-Al layer to surface direction that the oxide ceramic material layer contacts on, be that 0 to 100% continuous gradient changes.
3. tolerance of liquid zinc etching resist as claimed in claim 2 is characterized in that, the thickness of described Fe-Al and oxide ceramic material mixolimnion is 0.05-0.1mm.
4. tolerance of liquid zinc etching resist as claimed in claim 1 is characterized in that, described Fe-Al layer is FeAl
3, Fe
2Al
3, FeAl and Fe
3A kind of among the Al or several.
5. as claim 1 or 4 described tolerance of liquid zinc etching resists, it is characterized in that the thickness of described Fe-Al layer is 0.15-0.3mm.
6. tolerance of liquid zinc etching resist as claimed in claim 1 is characterized in that, described oxide ceramic material layer is Al
2O
3-(2-20) TiO
2Or Cr
2O
3
7. tolerance of liquid zinc etching resist as claimed in claim 6 is characterized in that, described oxide ceramic material layer thickness is 0.05-0.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02155185 CN1258615C (en) | 2002-12-17 | 2002-12-17 | Liquid zinc erosion-resistant coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02155185 CN1258615C (en) | 2002-12-17 | 2002-12-17 | Liquid zinc erosion-resistant coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1508281A CN1508281A (en) | 2004-06-30 |
| CN1258615C true CN1258615C (en) | 2006-06-07 |
Family
ID=34235776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02155185 Expired - Fee Related CN1258615C (en) | 2002-12-17 | 2002-12-17 | Liquid zinc erosion-resistant coating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1258615C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103522653B (en) * | 2013-10-09 | 2016-02-03 | 河北工业大学 | For the Multi-layer composite ceramic coating and preparation method thereof of galvanizing by dipping |
| CN104708863A (en) * | 2013-12-11 | 2015-06-17 | 北京有色金属研究总院 | Chromium oxide and alumina composite coating and preparation method thereof |
| CN105463444B (en) * | 2014-09-29 | 2018-10-30 | 上海宝钢工业技术服务有限公司 | Preparation method applied to sinking roller and the wear-resistant composite coating of the resistance to corrode of stabilizing roller |
-
2002
- 2002-12-17 CN CN 02155185 patent/CN1258615C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1508281A (en) | 2004-06-30 |
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