EP0360781A2 - Process for the single or double-sided zinc plating of stainless steel - Google Patents
Process for the single or double-sided zinc plating of stainless steel Download PDFInfo
- Publication number
- EP0360781A2 EP0360781A2 EP89890223A EP89890223A EP0360781A2 EP 0360781 A2 EP0360781 A2 EP 0360781A2 EP 89890223 A EP89890223 A EP 89890223A EP 89890223 A EP89890223 A EP 89890223A EP 0360781 A2 EP0360781 A2 EP 0360781A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- stainless steel
- zinc
- sided
- temperature
- double
- 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.)
- Granted
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 27
- 239000010935 stainless steel Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 22
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 18
- 239000011701 zinc Substances 0.000 title claims abstract description 18
- 238000007747 plating Methods 0.000 title abstract 2
- 150000003751 zinc Chemical class 0.000 claims abstract description 5
- 239000007864 aqueous solution Substances 0.000 claims abstract description 3
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000003792 electrolyte Substances 0.000 claims description 9
- 238000005246 galvanizing Methods 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 5
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910000510 noble metal Inorganic materials 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 3
- 229960001763 zinc sulfate Drugs 0.000 claims description 3
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 3
- 229910000978 Pb alloy Inorganic materials 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000009713 electroplating Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
Definitions
- the object of the present invention is to provide a method for galvanizing stainless steel, in particular for the automotive industry, which overcomes the problems described above and avoids contact corrosion with galvanized sheet metal.
- the stainless steel is connected in the form of a stainless steel strip in a galvanic cell as the cathode, and from an aqueous solution of a zinc salt with a pH of 1.0 to 2.5 , preferably from 1.5 to 2.0, metallic zinc is deposited on the stainless steel belt.
- the coating is carried out at a constant current density. This measure has the advantage that the process time can be shortened considerably since pretreatment at low currents is not necessary. In addition, the size of the electroplating system is kept small, since the pretreatment section is omitted.
- the current densities in the process according to the invention are between 25 and 200 A / dm2 for the one-sided coating, preferably between 50 and 150 A / dm2, and between 10 and 100 A / dm2, preferably between 25 and 75 A / dm2 for the two-sided coating.
- the zinc separated from the solution is replenished in a dissolving station using metallic zinc or zinc oxide.
- the zinc salt can also be present as zinc sulfate, the concentration of dissolved zinc ions in the solution being 20 to 150 g / l, preferably 100 to 130 g / l.
- the temperature of the electrolyte is 20 to 90 ° C, preferably 45 to 60 ° C.
- insoluble anodes are used as anodes, which consist of lead, a lead alloy or of titanium coated with a noble metal.
- the adhesive strength of the deposited zinc layer can be increased by a subsequent heat treatment, which is preferably carried out at a temperature of 100 to 400 ° C., in particular at 200 to 300 ° C., the stainless steel strip being heated and heated by heat sources, for example in a conventional infrared oven is kept at temperature.
- the duration of the heat treatment is related to the temperature used and is in the range between 30 minutes, preferably at temperatures in the lower limit range and 1 minute, preferably in the upper limit range of the treatment temperatures.
- the values for the duration of the treatment can still fluctuate within the specified values depending on the parameters selected for the electrolytic galvanizing.
- a ferritic stainless steel cold strip from a bank annealing plant was first degreased and cleaned on both sides, then picked up on the side to be coated, rinsed and placed in an electrolytic galvanizing plant that works with cells from a gravitational system.
- Insoluble noble metal anodes on a titanium carrier material were used as the anodes for the coating, the electrolyte was an aqueous zinc sulfate solution, the concentration of dissolved zinc ions in the solution being 125 g / l.
- the stainless steel strip was coated on one side with a zinc layer of 15 ⁇ m thick.
- a Subsequent analysis of the material produced showed excellent adhesion of the zinc layer to the base material, but a slight pitting occurred on the back.
- a ferritic stainless steel cold strip was treated as in Example 1 and coated under conditions which were identical except for the electrolyte temperature.
- the said temperature of the zinc electrolyte was reduced to 50 ° C this time.
- the pH of the electrolyte was now 3.2, all other values corresponded to those of the first examples.
- the zinc layer could now be completely removed from the stainless steel strip like a foil.
- the galvanizing plant has now been switched to double-sided operation and a stainless steel strip of the same quality, after identical pretreatment on both sides, has also been coated on both sides to a thickness of 7.5 ⁇ m.
- the current density was 35 A / dm2 and the zinc ion concentration was again 125 g / l. Both at pH values of 1.2 and 1.7, the samples produced were perfect at 50 ° C. and at 60 ° C. with excellent coating adhesion.
- Example 2 After identical pretreatment to Example 1, a stainless steel strip of AISI 410Cb quality was galvanized. As a surprising effect, it was found that there was reduced adhesion of the zinc layer in the entire range of process parameters covered by Examples 1 to 9.
- the coated material from Example 10 was subjected to a thermal aftertreatment. It was treated in an infrared oven at 220 ° C. over a period of 20 minutes, as a result of which the adhesion of the coating could be improved to those values which were achieved with the ferritic stainless steel cold strip in the process parameters given in example 4 or 7.
- a thermal aftertreatment was also carried out on the sample produced from Example 8.
- the material was in an infrared oven at 300 ° C for a period of about 1-5 minutes heated. As a result, the zinc layer adhered equally well to the base material.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Coating With Molten Metal (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
Verfahren zum elektrolytischen Verzinken von Stahlbändern sind seit vielen Jahren bekannt und in verschiedenen Ausführungsformen in der Literatur ausführlich beschrieben.Methods for the electrolytic galvanizing of steel strips have been known for many years and are described in detail in various embodiments in the literature.
Hingegen ist über das elektrolytische Verzinken von Edelstahlbändern bis duto nur sehr wenig bekannt. Die Ursache hiefür liegt darin, daß - wie Versuche gezeigt haben - nur ein sehr enger Bereich von Bedingungen bei derartigen Verfahren zur Verfügung steht.On the other hand, very little is known about the electrolytic galvanizing of stainless steel strips to duto. The reason for this is that - as tests have shown - only a very narrow range of conditions are available in such processes.
Die für Stahlbänder üblichen Verfahren arbeiten in einem pH-Bereich von unter 1 bis etwa 4 bei Temperaturen von 40 bis 70°C und Stromdichten bis zu 200 A/dm². Dieser Bereich muß nun bei Verfahren mit Edelstahl stark eingeschränkt werden.The processes customary for steel strips work in a pH range from less than 1 to about 4 at temperatures from 40 to 70 ° C and current densities up to 200 A / dm². This area must now be severely restricted for processes with stainless steel.
Verwendet man Säurekonzentrationen mit einem pH-Wert 1,5, wird das Edelstahlband durch die Säure angegriffen und infolgedessen matt, und mit Hilfe von Rasterelektronenmikroskopaufnahmen ist deutlich Lochfraßkorrosion zu erkennen. Bei pH-Werten über 2,5 erhält man dagegen eine sehr schlechte Haftung des Zinks am Edelstahl, und die Beschichtung läßt sich wie eine Folie abziehen. Des weiteren haben verschiedene Legierungselemente des Edelstahls zusätzlich die unerwünschte Eigenschaft, die Haftung zu verringern.If acid concentrations with a pH of 1.5 are used, the stainless steel strip is attacked by the acid and consequently becomes matt, and pitting corrosion can be clearly recognized with the aid of scanning electron microscope images. At pH values above 2.5, however, the zinc adheres very poorly to the stainless steel and the coating can be peeled off like a film. Furthermore, various alloying elements of stainless steel also have the undesirable property of reducing the adhesion.
Schließlich ist man durch die geringere spezifische Leitfähigkeit des Edelstahls, welche nur etwa ein Fünftel derjenigen des Stahls beträgt, auch in den Stromdichten zur Abscheidung aus wirtschaftlichen Gründen begrenzt.Finally, the lower specific conductivity of the stainless steel, which is only about a fifth of that of the steel, also limits the current densities for deposition for economic reasons.
Die Aufgabe der vorliegenden Erfindung liegt nun darin, ein Verfahren zum Verzinken von Edelstahl, insbesondere für die Autoindustrie zu schaffen, welches die oben beschriebene Problematik überwindet und die Kontaktkorrosion mit verzinktem Blech vermeidet.The object of the present invention is to provide a method for galvanizing stainless steel, in particular for the automotive industry, which overcomes the problems described above and avoids contact corrosion with galvanized sheet metal.
Diese Aufgabe wird durch ein Verfahren der eingangs beschriebenen Art erfindungsgemäß dadurch gelöst, daß der Edelstahl in Form eines Edelstahlbandes in einer galvanischen Zelle als Kathode geschaltet wird, und aus einer wässrigen Lösung eines Zinksalzes mit einem pH-Wert von 1,0 bis 2,5, vorzugsweise von 1,5 bis 2,0, metallisches Zink auf dem Edelstahlband abgeschieden wird.This object is achieved according to the invention by a method of the type described in the introduction in that the stainless steel is connected in the form of a stainless steel strip in a galvanic cell as the cathode, and from an aqueous solution of a zinc salt with a pH of 1.0 to 2.5 , preferably from 1.5 to 2.0, metallic zinc is deposited on the stainless steel belt.
Gemäß einem weiteren Merkmal der Erfindung erfolgt die Beschichtung bei konstanter Stromdichte. Diese Maßnahme bringt den Vorteil mit sich, daß die Prozeßdauer wesentlich verkürzt werden kann, da eine Vorbehandlung bei niedrigen Stromstärken nicht notwendig ist. Überdies wird auch die Größe der Galvanikanlage gering gehalten, da der Abschnitt zur Vorbehandlung wegfällt.According to a further feature of the invention, the coating is carried out at a constant current density. This measure has the advantage that the process time can be shortened considerably since pretreatment at low currents is not necessary. In addition, the size of the electroplating system is kept small, since the pretreatment section is omitted.
Die Stromdichten beim erfindungsgemäßen Verfahren liegen für die einseitige Beschichtung zwischen 25 und 200 A/dm², vorzugsweise zwischen 50 und 150 A/dm², und für die beidseitige Beschichtung zwischen 10 und 100 A/dm², vorzugsweise zwischen 25 und 75 A/dm².The current densities in the process according to the invention are between 25 and 200 A / dm² for the one-sided coating, preferably between 50 and 150 A / dm², and between 10 and 100 A / dm², preferably between 25 and 75 A / dm² for the two-sided coating.
Das aus der Lösung abgeschiedene Zink wird in einer Lösestation unter Verwendung von metallischem Zink oder Zinkoxid ergänzt.The zinc separated from the solution is replenished in a dissolving station using metallic zinc or zinc oxide.
Nach einem Merkmal des erfindungsgemäßen Verfahrens kann das Zinksalz auch als Zinksulfat vorliegen, wobei die Konzentration an gelösten Zinkionen in der Lösung 20 bis 150 g/l, vorzugsweise 100 bis 130 g/l beträgt.According to one feature of the method according to the invention, the zinc salt can also be present as zinc sulfate, the concentration of dissolved zinc ions in the solution being 20 to 150 g / l, preferably 100 to 130 g / l.
Die Temperatur des Elektrolyts beträgt 20 bis 90°C, vorzugsweise 45 bis 60°C.The temperature of the electrolyte is 20 to 90 ° C, preferably 45 to 60 ° C.
Allerdings ist mit steigenden Temperaturwerten des Elektrolyts auch ein vermehrtes Auftreten von Lochfraßkorrosion verbunden, insbesondere bei pH-Werten, die nahe der unteren der genannten Bereichsgrenzen liegen.However, with increasing temperature values of the electrolyte, there is also an increased occurrence of pitting corrosion, in particular at pH values which are close to the lower of the mentioned range limits.
Nach einem weiteren Merkmal des erfindungsgemäßen Verfahrens werden als Anoden unlösliche Anoden verwendet, welche aus Blei, einer Bleilegierung oder aus edelmetallbeschichtetem Titan bestehen.According to a further feature of the method according to the invention, insoluble anodes are used as anodes, which consist of lead, a lead alloy or of titanium coated with a noble metal.
Die Haftfestigkeit der abgeschiedenen Zinkschicht kann durch eine nachfolgende Wärmebehandlung erhöht werden, welche vorzugsweise bei einer Temperatur von 100 bis 400°C, insbesondere bei 200 bis 300°C durchgeführt wird, wobei das Edelstahlband durch Wärmequellen, beispielsweise in einem herkömmlichen Infrarot-Ofen erhitzt und auf Temperatur gehalten wird.The adhesive strength of the deposited zinc layer can be increased by a subsequent heat treatment, which is preferably carried out at a temperature of 100 to 400 ° C., in particular at 200 to 300 ° C., the stainless steel strip being heated and heated by heat sources, for example in a conventional infrared oven is kept at temperature.
Die zeitliche Dauer der Wärmbehandlung steht in Zusammenhang mit der zur Anwendung kommenden Temperatur und liegt im Bereich zwischen 30 Minuten, vorzugsweise bei Temperaturen im unteren Grenzbereich und 1 Minute, vorzugsweise im oberen Grenzbereich der Behandlungstemperaturen. Jedoch können die Werte für die Behandlungsdauer je nach dem bei der elektrolytischen Verzinkung gewählten Parametern noch innerhalb der angegebenen Werte schwanken.The duration of the heat treatment is related to the temperature used and is in the range between 30 minutes, preferably at temperatures in the lower limit range and 1 minute, preferably in the upper limit range of the treatment temperatures. However, the values for the duration of the treatment can still fluctuate within the specified values depending on the parameters selected for the electrolytic galvanizing.
Nachfolgend werden anhand von Anwendungsbeispielen weitere Einzelheiten bzw. Vorteile des vorliegenden erfindungsgemäßen Verfahrens beschrieben:In the following, further details and advantages of the method according to the invention are described on the basis of application examples:
Ein ferritisches Edelstahl-Kaltband aus einer Bankglühanlage wurde zuerst beidseitig entfettet, und gereinigt, danach auf der zu beschichtenden Seite dekapiert, gespült und in eine elektrolytische Verzinkungsanlage eingebracht, die mit Zellen eines Gravitelsystems arbeitet. Als Anoden für die Beschichtung wurden unlösliche Edelmetallanoden auf einem Titanträgermaterial verwendet, der Elektrolyt war eine wässrige Zinksulfat-Lösung, wobei die Konzentration an gelösten Zinkionen in der Lösung 125 g/l betrug. Bei einer Stromdichte von 70 A.dm², einer Elektrolyttemperatur von 60°C und einem pH-Wert des Elektrolyts von 1,2 wurde das Edelstahlband einseitig mit einer Zinkschicht von 15 µm Dicke beschichtet. Eine anschließende Analyse des produzierten Materials ergab eine ausgezeichnete Haftung der Zinkschicht am Grundmaterial, auf der Rückseite trat jedoch ein leichter Lochfraß auf.A ferritic stainless steel cold strip from a bank annealing plant was first degreased and cleaned on both sides, then picked up on the side to be coated, rinsed and placed in an electrolytic galvanizing plant that works with cells from a gravitational system. Insoluble noble metal anodes on a titanium carrier material were used as the anodes for the coating, the electrolyte was an aqueous zinc sulfate solution, the concentration of dissolved zinc ions in the solution being 125 g / l. At a current density of 70 A.dm², an electrolyte temperature of 60 ° C and a pH value of the electrolyte of 1.2, the stainless steel strip was coated on one side with a zinc layer of 15 µm thick. A Subsequent analysis of the material produced showed excellent adhesion of the zinc layer to the base material, but a slight pitting occurred on the back.
Ein ferritisches Edelstahl-Kaltband wurde wie im Beispiel 1 behandelt und bei Bedingungen, die bis auf die Elektrolyttemperatur identisch waren, beschichtet. Die besagte Temperatur des Zink-Elektrolyten wurde diesmal auf 50°C abgesenkt. Es ergab sich gleichfalls eine ausgezeichnete Haftung der Zinkschicht; der Lockfraß war nun nicht mehr so stark ausgeprägt.A ferritic stainless steel cold strip was treated as in Example 1 and coated under conditions which were identical except for the electrolyte temperature. The said temperature of the zinc electrolyte was reduced to 50 ° C this time. There was also excellent adhesion of the zinc layer; the pitting was no longer so pronounced.
Bei sonst analogen Bedingungen zu Beispiel 1 und 2 wurde der pH-Wert auf 1,7 erhöht, was bei beiden angeführten Temperaturen sowohl eine ausgezeichnete Haftung, als auch keinerlei Anzeichen von Lochfraßkorrosion ergab.Under otherwise analogous conditions to Examples 1 and 2, the pH was raised to 1.7, which at the two temperatures indicated gave excellent adhesion and showed no signs of pitting corrosion.
Eine weitere Erhöhung des pH-Wertes auf 2,2 bei sonst identischen Parametern zu den obigen Beispielen ergab bei beiden Temperaturwerten (60°C und 50°C) eine verringerte Haftung der Zinkschicht (ermittelt durch Erichsen-Test).A further increase in the pH value to 2.2 with otherwise identical parameters to the above examples resulted in a reduced adhesion of the zinc layer at both temperature values (60 ° C. and 50 ° C.) (determined by the Erichsen test).
Der pH-Wert des Elektrolyten betrug nun 3,2, alle anderen Werte entsprachen denjenigen der ersten Beispiele. Die Zinkschicht ließ sich nun vom Edelstahlband wie eine Folie komplett abziehen.The pH of the electrolyte was now 3.2, all other values corresponded to those of the first examples. The zinc layer could now be completely removed from the stainless steel strip like a foil.
Die Verzinkungsanlage wurde nun auf beidseitigen Betrieb umgestellt und ein Edelstahlband gleicher Qualität nach nunmehr beidseitiger identischer Vorbehandlung auch beidseitig auf je 7,5 µm Dicke beschichtet. Die Stromdichte betrug 35 A/dm² und die Zinkion-Konzentration wiederum 125 g/l. Sowohl bei pH-Werten von 1,2 als auch 1,7 waren die hergestellten Proben bei 50°C und bei 60°C einwandfrei bei ausgezeichneter Haftung der Beschichtung.The galvanizing plant has now been switched to double-sided operation and a stainless steel strip of the same quality, after identical pretreatment on both sides, has also been coated on both sides to a thickness of 7.5 µm. The current density was 35 A / dm² and the zinc ion concentration was again 125 g / l. Both at pH values of 1.2 and 1.7, the samples produced were perfect at 50 ° C. and at 60 ° C. with excellent coating adhesion.
Bei einem pH-Wert des Elektrolyts von 2,2 und einer Temperatur von 50°C waren die Proben ebenfalls einwandfrei.With a pH value of 2.2 and a temperature of 50 ° C the samples were also perfect.
Bei ansonst identischen Bedingungen zu Beispiel 6 und 7 war bei einem pH-Wert von 2,2 und einer Temperatur von nunmehr 60°C eine verringerte Haftung der Zinkschicht am Grundmaterial nachzuweisen.Under otherwise identical conditions to Examples 6 and 7, a reduced adhesion of the zinc layer to the base material was demonstrated at a pH of 2.2 and a temperature of now 60 ° C.
Nach Erhöhung des pH-Wertes auf 3,2 wurde sowohl bei 50°C als auch bei 60°C verringerte Haftung festgestellt.After increasing the pH to 3.2, reduced adhesion was found at both 50 ° C and 60 ° C.
Des weiteren wurde nach identischer Vorbehandlung zu Beispiel 1 ein Edelstahlband der Qualität AISI 410Cb verzinkt. Als überraschender Effekt zeigt sich dabei, daß im gesamten, von den Beispielen 1 bis 9 überdeckten Bereich für die Verfahrensparameter eine verringerte Haftung der Zinkschicht gegeben war.Furthermore, after identical pretreatment to Example 1, a stainless steel strip of AISI 410Cb quality was galvanized. As a surprising effect, it was found that there was reduced adhesion of the zinc layer in the entire range of process parameters covered by Examples 1 to 9.
Das beschichtete Material aus Beispiel 10 wurde einer thermischen Nachbehandlung unterzogen. Es wurde in einem Infrarot-Ofen bei 220°C über eine Dauer von 20 Minuten behandelt, wodurch die Haftung der Beschichtung auf jene Werte verbessert werden konnte, die mit dem ferritischen Edelstahl-Kaltband bei den in Beispiel 4 oder 7 angeführten Verfahrensparametern erzielt wurden.The coated material from Example 10 was subjected to a thermal aftertreatment. It was treated in an infrared oven at 220 ° C. over a period of 20 minutes, as a result of which the adhesion of the coating could be improved to those values which were achieved with the ferritic stainless steel cold strip in the process parameters given in example 4 or 7.
Bei der hergestellten Probe aus Beispiel 8 wurde ebenfalls eine thermisch Nachbehandlung durchgeführt. In einem Infrarot-Ofen wurde das Material bei 300°C über einen Zeitraum von ca. 1-5 Minuten erhitzt. Daraufhin war eine ebenso gute Haftung der Zinkschicht am Grundmaterial gegeben.A thermal aftertreatment was also carried out on the sample produced from Example 8. The material was in an infrared oven at 300 ° C for a period of about 1-5 minutes heated. As a result, the zinc layer adhered equally well to the base material.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT89890223T ATE104370T1 (en) | 1988-09-14 | 1989-09-01 | PROCESS FOR ZINCING STAINLESS STEEL ON ONE OR BOTH SIDES. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPJ225788 | 1988-09-14 | ||
| AU2257/88 | 1988-09-14 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0360781A2 true EP0360781A2 (en) | 1990-03-28 |
| EP0360781A3 EP0360781A3 (en) | 1990-04-11 |
| EP0360781B1 EP0360781B1 (en) | 1994-04-13 |
Family
ID=3773642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89890223A Expired - Lifetime EP0360781B1 (en) | 1988-09-14 | 1989-09-01 | Process for the single or double-sided zinc plating of stainless steel |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0360781B1 (en) |
| AT (1) | ATE104370T1 (en) |
| DE (1) | DE58907447D1 (en) |
| ES (1) | ES2055165T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2327805A1 (en) * | 2009-11-14 | 2011-06-01 | Bayerische Motoren Werke Aktiengesellschaft | Method and production assembly for producing a sheet metal part with a corrosion-resistant coating |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS609895A (en) * | 1983-06-27 | 1985-01-18 | Sumitomo Metal Ind Ltd | Manufacture of alloyed galvanized steel sheet |
| EP0269808A1 (en) * | 1986-10-01 | 1988-06-08 | Kawasaki Steel Corporation | Stainless steel sheets and process for preparing same |
-
1989
- 1989-09-01 ES ES89890223T patent/ES2055165T3/en not_active Expired - Lifetime
- 1989-09-01 DE DE58907447T patent/DE58907447D1/en not_active Expired - Fee Related
- 1989-09-01 EP EP89890223A patent/EP0360781B1/en not_active Expired - Lifetime
- 1989-09-01 AT AT89890223T patent/ATE104370T1/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS609895A (en) * | 1983-06-27 | 1985-01-18 | Sumitomo Metal Ind Ltd | Manufacture of alloyed galvanized steel sheet |
| EP0269808A1 (en) * | 1986-10-01 | 1988-06-08 | Kawasaki Steel Corporation | Stainless steel sheets and process for preparing same |
Non-Patent Citations (1)
| Title |
|---|
| Chemical Abstracts Vol 103 1985 no 8 Columbus OHIO US S. 501, zus. 61516 & JP-A-60 09 895 (Sumitomo Metal Industries) 18.1.1985 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2327805A1 (en) * | 2009-11-14 | 2011-06-01 | Bayerische Motoren Werke Aktiengesellschaft | Method and production assembly for producing a sheet metal part with a corrosion-resistant coating |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0360781B1 (en) | 1994-04-13 |
| ATE104370T1 (en) | 1994-04-15 |
| DE58907447D1 (en) | 1994-05-19 |
| EP0360781A3 (en) | 1990-04-11 |
| ES2055165T3 (en) | 1994-08-16 |
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