MXPA98006679A - Bath and galvanized process for immersion in calie - Google Patents
Bath and galvanized process for immersion in calieInfo
- Publication number
- MXPA98006679A MXPA98006679A MXPA/A/1998/006679A MX9806679A MXPA98006679A MX PA98006679 A MXPA98006679 A MX PA98006679A MX 9806679 A MX9806679 A MX 9806679A MX PA98006679 A MXPA98006679 A MX PA98006679A
- Authority
- MX
- Mexico
- Prior art keywords
- weight
- bath
- zinc
- tin
- steel
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 8
- 238000007654 immersion Methods 0.000 title description 5
- 239000011701 zinc Substances 0.000 claims abstract description 28
- 229910052718 tin Inorganic materials 0.000 claims abstract description 27
- ATJFFYVFTNAWJD-UHFFFAOYSA-N tin hydride Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 27
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 10
- 239000011575 calcium Substances 0.000 claims abstract description 10
- 238000005246 galvanizing Methods 0.000 claims abstract description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011777 magnesium Substances 0.000 claims abstract description 10
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 27
- 229910052759 nickel Inorganic materials 0.000 claims description 13
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 abstract description 18
- 238000000576 coating method Methods 0.000 abstract description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 11
- 239000010703 silicon Substances 0.000 abstract description 11
- 229910052710 silicon Inorganic materials 0.000 abstract description 11
- 239000012535 impurity Substances 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical class [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 6
- 239000011133 lead Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium monoxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000001419 dependent Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- -1 iron-zinc Chemical compound 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910007610 Zn—Sn Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052803 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- KEAYESYHFKHZAL-UHFFFAOYSA-N sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium(0) Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Abstract
A zinc bath is provided, which is particularly useful for batch galvanizing of steel article, contains 3-15% by weight of tin, lead, at a concentration up to saturation and 0-0.06% by weight of at least one aluminum, calcium and magnesium, the rest is zinc and unavoidable impurities in order to decrease the influence of the silicon content of the steel to be galvanized on the thickness of coating
Description
BATHROOM AND GALVANIZED PROCESS FOR HOT IMMERSION
DESCRIPTION OF THE INVENTION
The present invention relates to a bath for hot dip galvanizing consisting of zinc alloy, which is particularly useful for galvanizing steel items in batches, the content of silicon which is variable or the composition of which is unknown. When steel is galvanized in a conventional zinc bath without alloy, serious problems arise when the steel contains more than 0.02% by weight of silicon: the resulting zinc coating is too thick and too brittle, and also has a grayish appearance. This is due to the fact that the iron-zinc alloy layer that forms on the surface of the steel when the latter is in contact with a conventional zinc bath, grows linearly with time during the entire duration of the immersion, when Steel contains more than 0.02% silicon. This is not the case with steels containing less silicon, since the growth rate here is proportional to the square root of the immersion time. The influence of the silicon content of the steel in the coating thickness is illustrated in the diagram of the attached figure 1: the maximum thickness in steels with 0.03-0.15% by weight of Si is called the Sandelin peak.
* «
- 2 - Efforts have already been made in the past to solve this problem. The Technigalva ™ process uses a bath of zinc mixed or alloyed with 0.05-0.06% by weight of nickel. As shown in Figure 1, the Sandelin peak disappears in the Technigalva ™ bath, but the thickness of the coating still increases with a silicon content of the steel. The PolygalvaM process uses a zinc bath with 0.035 - 0.045% by weight of aluminum and 0.003-0.005% by weight of magnesium. As shown in Figure 1, the Polygalva ™ bath provides rather good results; however, it has the drawback that the aluminum content must be controlled very strictly, because the reaction between the steel and the bath is almost completely blocked once the aluminum content of the bath exceeds 0.05% by weight. The object of the present invention is to provide a bath for hot-dip galvanizing consisting of zinc in alloy, which makes the coating thickness much less dependent on the silicon content of the steel as would be the case with the Technigalva ™ bath, and much more. less dependent on small variations in the composition of the bathroom such as the bathroom with the PolygalvaTM case. This object is achieved according to the invention by a bath having either 3-15% by weight of tin or 1-15% by weight of tin and 0.01-0.1% by weight of nickel and which may contain lead at a concentration until saturation and at least one of aluminum, calcium and magnesium, up to a concentration of up to 0.06% by weight, the rest is zinc and unavoidable impurities. When the bath does not contain nickel, it is preferred that the tin content be 3.5-14% by weight, the most preferred tin content is 5-10% by weight. When it contains nickel, it is preferred that the content of tin and nickel be, respectively, 2.5-5% by weight and 0.03-0.06% by weight. The nickel content of the bath with 1-5% by weight of tin should be at least 0.01% by weight; otherwise, the thickness of the coating can vary substantially with the silicon content of the steel. However, the nickel content should not exceed 0.1% by weight; otherwise, there is a risk of floating slag formation. The addition of lead at a concentration that can reach saturation, for example, 0.1-1.2% by weight, can be useful in order to discuss the surface tension of the bath. An addition of at least one of aluminum, calcium and magnesium, preferably at a concentration of 0-0.03% by weight and more preferably 0.005-0.015% by weight may also be useful in order to protect the zinc from oxidation; otherwise, a yellowish film forms on the surface of the bath, which fouls the galvanized articles. However, preferably the aluminum content should not exceed 0.03% by weight; otherwise, there is a risk of obtaining points that are not covered. The content of magnesium and / or calcium should not exceed 0.03% by weight; otherwise, the MgO or CaO floating on the surface of the bath can deteriorate the coating; In addition, the bathroom becomes less stressed which can result in a coating finish. Zinc can be of any quality ranging from remelted zinc waste to SHG (special high grade). However, it is recommended to use Zn 98.5 (ISO standard 752-1981), preferably at least Zn 99.5 and even more preferably at least Zn 99.95. It should be noted here that LU-A-81 061 describes a process consisting of a galvanizing bath which contains at least 70% by weight of zinc, characterized in that one or more of the following elements are added to the galvanizing bath: chromium, nickel, boron, titanium, vanadium, zirconium, manganese, copper, niobium, cerium, molybdenum, cobalt, antimony, calcium, lithium, sodium, potassium, in an amount such that the bath contains less than 2% by weight of each item taken separately. In addition, GB-22 89 691 describes the coating of a wide range of metal substrates with a low reflectance and highly corrosion resistant layer of a zinc-tin based alloy. A coating alloy with a zinc concentration in the range of 30-85% by weight is mentioned together with a tin concentration in the range of 15-70% by weight. The alloy may also contain nickel, bismuth, antimony, copper, iron and lead. The coating can be applied to the substrate by the hot dip process, that is, by passing the metal substrate through a coating tub containing a molten alloy. The invention is further illustrated by the following examples.
Example 1
Six types of steel called X, M, E, D, R and Y with different contents of silicon and phosphorus have been galvanized in zinc SHG baths with different contents of tin, using a bath temperature of 450 ° C and a time of 5 minute immersion. The thickness of the coating has been measured. The results of these tests are summarized in table 1 below.
Table 1 (Zn-Sn baths)
The graphic representation of these results in the diagram of figure 2 shows that from a tin content of approximately 3% by weight in five of the six steels tested, they already have a coating thickness of less than 150 μm and that from of a tin content of 5% by weight in all the steels tested have a coating thickness ranging from about 75 μm to about 110 μm. In this context, it should be noted that the coating thickness of 70-90 μm is the most desirable. It should also be noted that steel type Y with
0. 075% by weight of Si and 0.17% by weight of P is particularly reactive, the effect of P on the reactivity of the steel is still much more pronounced than that of Si. From the above data, it is also clear that the result does not improve when the tin content exceeds 15% by weight, and it is advisable to use a maximum of 10% by weight of tin.
Example 2
The same types of steel as in Example 1 have been galvanized in SHG zinc baths with 0.055% by weight of nickel and various tin contents under the same conditions as in Example 1. The results of these tests are summarized in FIG.
Table 2 below.
Table 2 (Zn baths - 0.055 Ni - Sn)
The graphic representation of these results in the diagram of Figure 3 shows that a tin content of 1% by weight provides either a significant improvement. It also shows that it is advisable to use a tin content that varies between 2.5 and 5% by weight.
3
The same types of steel as in Example 1 were galvanized in zinc SHG baths with 1.2% lead by weight and with variable contents of tin under the same conditions as in Example 1. The results of these tests are summarized in Table 3 then.
Table 3 (Zn baths - 1.2 Pb - Sn)
The graphic representation of these results in the diagram of figure 4 again shows the beneficial effect of tin on the thickness of the coating. The results obtained with 3% by weight of tin apparently are somewhat better here than in Example 1 (see Figure 2). This is why it can be useful to add lead to the bathroom. The foregoing makes it clear that the bath of the present invention allows to avoid both the drawback of the Technigalva ™ bath and the drawback of the Polygalva ™ bath.
Another advantage of the bath of the present invention is based on the fact that it provides a more pleasing floral pattern and a greater brilliance compared to the prior art baths. It is also notable that in long-term tests, the bath of the present invention has not been observed bottom slag formation or floating slag formation. It is also important that the consumption of tin is limited, the tin content of the coating is much less than the tin content in the bath. This is the reason why the bath of the present invention is particularly useful for fee galvanizing processes, where the galvanizer must treat all kinds of steel articles, whose content of silicon and phosphorus is usually unknown to him.
Claims (11)
1. A bath for hot dip galvanizing with zinc alloy, characterized in that it contains 3-15% by weight of tin, lead at a concentration up to saturation and 0-0.06% of at least one of aluminum, calcium and magnesium, The rest is zinc, of any quality ranging from remelted zinc waste to zinc SHG.
2. A bath for hot dip galvanizing with zinc alloy, characterized in that it contains 1-5% by weight of tin, 0.01-0.1% by weight of nickel, lead at a concentration up to saturation and 0-0.06% by weight of at least one of aluminum, calcium and magnesium, the rest is zinc of any quality ranging from remelted zinc waste to zinc SHG.
3. The bath according to claim 1, characterized in that it contains 0-0.03% by weight of at least one of aluminum, calcium and magnesium.
4. The bath according to claim 2, characterized in that it contains 0-0.03% by weight of at least one of aluminum, calcium and magnesium.
5. The bath according to claims 1 or 3, characterized in that it contains 3.5-14% by weight of tin.
6. The bath according to claim 5, characterized in that it contains 5-10% by weight of tin.
7. The bath according to claims 2 or 4, characterized in that it contains 2.5% by weight of tin.
8. The bath according to claims 2, 4 or 7, characterized in that it contains at least 0.03% by weight of nickel.
9. The bath according to claim 8, characterized in that it contains 0.03-0.06% by weight of nickel.
10. The bath according to any of claims 1 to 9, characterized in that it contains 0.005-0.015% by weight of at least one of aluminum, calcium and magnesium.
11. A process for galvanizing steel by hot dip, in batches, characterized in that it uses the bath according to any of claims 1 to 10.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96200465.1 | 1996-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MXPA98006679A true MXPA98006679A (en) | 1999-02-24 |
Family
ID=
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4238532A (en) | Zinc alloy and galvanization process | |
| EP0038904B1 (en) | Process for producing a hot dip galvanized steel strip | |
| AU731443B2 (en) | Alloy and process for galvanizing steel | |
| EP0956380B1 (en) | Hot-dip galvanizing bath and process | |
| CA1303916C (en) | Zn-al hot-dip galvanized steel sheet having improved resistance against secular peeling and method for producing the same | |
| US6569268B1 (en) | Process and alloy for decorative galvanizing of steel | |
| MXPA98006679A (en) | Bath and galvanized process for immersion in calie | |
| US6280795B1 (en) | Galvanizing of reactive steels | |
| CN114686727A (en) | High-performance hot-dip galvanized alloy material and preparation method thereof | |
| EP0048270A1 (en) | Zinc-aluminum coatings. | |
| US5160552A (en) | Colored zinc coating | |
| EP0996763A1 (en) | Galvanizing of reactive steels | |
| KR960003730B1 (en) | Method for making a galvanized steel sheet with an excellent coating function | |
| JP3075318B2 (en) | Alloyed hot-dip galvanized steel sheet | |
| JPS58207363A (en) | Method of plating silicon-containing steel products, products plated thereby and alloy therefor | |
| CA2106763A1 (en) | Galvanizing method and zinc alloy for use therein | |
| KR950006275B1 (en) | Method for producing a hot-dipped galvanized steel sheet with an excellent surface brightness and surface smoothness | |
| JPS6152337A (en) | Zinc alloy for hot dip galvanizing | |
| JPH04157145A (en) | Galvannealed steel sheet | |
| EP1186679A1 (en) | Hot-dip galvanising alloy and process | |
| MXPA99011270A (en) | Galvanizing of reactive steels | |
| JPH0368748A (en) | Hot dip galvanized steel sheet and its production | |
| GB2227255A (en) | Galvanizing with compositions including tin |