DE2054090C3 - Process for single-layer enamelling of strips and sheets. Eliminated from: 2016989 - Google Patents

Description

7? 2lS ^ rii ^te W ^{tnBtelIe (S. USA} - ^{for the} application of the wipeable metallic

Annealing a S ^ f κ ^^ "*? Dem ^{layer are} various advantageous embodiments

αΞίϊίί Acid treatment of the BIe-forming possible. In a preferred manner, this is done

In addition to the elektrnlvtkrhpn »κ _Γ ι -j ,, · ^{on the sheet or} strip ^of a bivalent

and cobalt on de * I zn ΐΐί Ή ^g J ⁰ "u ^N ' ^{Ckd 5 iron-} containing electrolytes this at one

also known (Vg ^ STSSÄ ^ Slfs? % Τ *% * ^V ° " ^{5 Ws 1} ^ ' ^{in dner} ** ™?

the pickled sheet with an in! Tw- ¹⁰ \. ⁹⁵⁰ ) ¹⁰ to 30 seconds and subsequently from a non-inherent

StoÄSSSu ^ SlS «Zt zu""Γ H ^{biert nickel electrol} ^ n, e.g. from Wattschen or

pull the steel to the 7 «TT c. ^{of the Zltron} acidic type, at a current density of

e hSn so that Γ NfcESη J ^ '? T ^{8 TO 10 3 to 10 A} / ^{dm2 in a} " ^{r Zei} * from 6 to 15 see Nickel

SSwM of the Ii πί Sl ^^ coating deposited, however, can be expediently

the lead _C r _s chschlussl5 _m ? t ςί κ Λ "^ ^{and in the place of the} nickel electrolyte also a cobalt

Except dfeS vtf3, «nT ^ΖΙ Άί I?"' Containing sulfate electrolyte used and that

Nickel undfor Κοΐΐκ, ν vT _f ^A ^ ^separate a cobalt at a current density of 3 to 10 A / dm * in

renden "BlechenTst it also hVt ^ r T r ™ ^emaiUie - ^{15 the time from 6 to 15 se} 'on the sheet or strip

Pamphlet? 731 JA SS μ, ^{(VgL French} e to be deposited.

lh, ^ Sch cht _en S, I ieiun, 'J " ^{ZU BIeChCn for should in addition to iron} advantageously at the same time

St ÄfibTuTüi ν ⁶ ?? "^{SOlI> at least} one or at most two foreign metals

Metalloids ^ Ä H o ' ^K ° ^balt ° ^{which are} deposited, so it is advisable to au / dem

Ss cause ^ ^passive 'eration of the απ strip or sheet from a divalent iron as well

The Frfinrliino ii _PO t A _a α fu at the same time one or two of the metals manganese in

After a hurry of be JSn ν ΪΙ ^g ^ B ^ nd _e , which an amount of 1 to 20 g / l - introduced as manganese

Emaüieen vorÄ "method for the layer salfate, nickel in an amount of 10 to 50 g / l, cobalt

ϊϊή? t ° Λ ^ ³ " ⁰ "" ^{ZU Ver in a M} 10 to 50 / l hld Elkt

, l in an amount of 10 to 50 g / l, Ko

and? n, h _P tnH λΛ ^ ³ " ⁰ "" ^{ZU Ver} " ^{in an} amount of 10 to 50 g / l containing electrodes

"Γ? ^ J? ¹ ! ¹ *" of ^{this type 5 lt di bi ri} Sdiä 5 bi 20 A / d *

? n, h _P tnH λΛ ^ ^{in an} amount of 10 to 50 g / l containing electrodes mk the "" Γ? ^ J? ¹ ! ¹ * ". ^{Of this kind a5, with a pure current} diet of 5 to 20 A / dm * Wszeit shortening, _P , n, l · f · ^ T ^ ^treatment - to be separated ^{in a time of} 10 to 30 seconds, too of ShSnH ^{cont 'nu' he 'I} e treatment to explain the method according to the invention and; ith the S ^{r "you} can ^ ^h g ^e f ^uh" are is to point out the following: in a SäureeTnem normlnToh _e ι t f? "f? ^{bands mk b} Treatmen t at the beginning of the process initially dfc herein are subject to · be erne? Fn ^ Z% ^, f ^{and S} ° ^{lche '3} ° ^the ^ treatment undergone remaining alkaline residues ^{of the} degreasing on the sheet surface with Z J? neutralized and the top -EmaMbeT ^ L h ™, T ^ ^{NDFR ien "nd very haf} ^ th surface is easily oxidized, whereby no material from the Sse ^ _n lhj ⁸ η ^Become K ^{k, Ballonnen} - sheet surface is removed. The formed thin eintlifWnH "^ ^ ^Erfindun g at oxide layer assists in following procedure-Wes IlöS Γίί Z R ^ng H ⁿ⁸ J ^ge" T ^{th kind in th e} 35 step, the formation of a likewise relatively thin ηί, Η Λ "^ ^ ^Erzeu g ^un 8 ünnen ^d porous spongy or, not? ^{Xldsch 'CHT' n} nitric acid or hanging metal layer zusammensSfiefSZ. the special effect Srd HTR ^ f ^C _H ^hemiScl \ ^{or? dlsch} treated as this metal layer is that the ^ II ₇ prepared tape or sheet enamel to be applied later during the baking Lt πι!? ^W. ' ^s _u ^chbare P ^ori S ^e bnv. 40 ^hindurüh simultaneously with the deposited metal layer as H μ f ,, ^ ^{1, of iron and} also with the easily oxidized base material by \ Zl η ^{"e N} u ^{lCkel 'K0balt} · ^{manganese pores} ^ can act so that there is a r ν 7 J ^ ™ eV bathing ^{in an education} 8 ^y on z. B. Iron titanates come, which the good lcSnZrdZJ ^ T ^e ^ T ^{T b} l ^{S 80} ° ^{C ab} - ^adhesion 8 of ^{the enamel on the base} material under bathers £ 'Λ ρ α Z * ™ ^{nd thin} & ^only one 45 mediation of the oxide layer and the porous metal bath, the foreign metals nickel, cobalt and layer form the bath

The indication of the total S ^a TS ^U f ^ei i ^{he Ge} ^ l ^{to tk "onzen} concentration of Incidentally refers

· h '^ fI ^{0 the tape or ko} n ^z entration of up to 50 g / l of Fremdmctallen

r wL? a ZinkelcktToIyten in itself (calculated as metal) on the method according to the

rWmeverz.nkt.beim consumer chemical 50 invention, in which the deposition of iron and

emn _P ? f _t „ ^P H ^0Zen l ^lg l ^{r S} ? ^] P? ^säme at space - one or two of the foreign metals together in

iSwWrf ir / ^Z ' ^{nkschicht freed} t «nd is carried out on an electrolyte. Will against it

is enamelled by shooting. _the deposition of iron in a first bath of and

, «■ η η η 71! ^? l method of generating one or two of the foreign metals in a second

a thin oxide layer required acid treatment 55 bath, the second bath has a

vnrtriihift α ^{for the following} process steps, a relatively high concentration of the

before e.lhft if the sheet or strip in 3 to separating foreign metals.

ιη "if ^r J ^ ¹ ^ i" ⁸ * "" ^ch «n« «h in space- The advantages of the method according to the invention

αIn? ^b ' ^s60 , ^se ^. “Is dealt with closely or that is particularly to be seen in that simple

* n ^er H ? u 'c ^volum P ^rozenti ger saltpeter- 60 manner a continuous, relatively short

uVR ^{anodic at} T _n ^er current density of 10 A / dm 'Treatment of steel strips with normal

SmrT ^mP T i ° ^sec _n ^b e is ^treated . In appropriate carbon contents of about 0.04 to 0.10%

In moderation, the bath can contain a lot of lOvo as well as very low carbon contents of

IThZ T ^rS ? ^we i ^eI f ^"r e (l ° ^OO / o'g) ^z 'gesetztwer- about 0.006% conducted in the same manner

H u- ^S t ^{the anodic} acid 6 ₅ can be, being flawless and very adhesive

m ^ai \ ™ ^{tem perature from 40} to 80 ⁰ C enamel layers on these strips or sheets

10 percent by volume weakness h

^g m \ P ^{erature of 40} to 8OC enamel layers on this

g can be produced from 10 percent by volume sulfuric acid. ^{S e en} "I f

can be set.
The following is the procedure for

enamelling of steel strips and sheets using an advantageous workflow that is already has proven to be described in more detail.

example

1. Anodic degreasing in sodium hydroxide solution at a temperature of 80 ^c C and at a current density of 15 A / dm ² in a time of 6 seconds.

2. Rinse.

3. Treat at room temperature in volume percent Nitric acid in a time of 30 seconds.

4. Rinse.

5. Cathodic deposition of iron at room temperature from an electrolyte with the the following composition: i;

140 g / l iron (II) sulfate (FeSO ₄ 7 H ₂ O), 100 g / l magnesium sulfate (MgSO ₁ 7 H ₂ O), 50 g / l ammonia,

the pH of which is adjusted to 2.0 with sulfuric acid, at a current density of 10 A / dm ² , in a time of 10 seconds;
Ancide material: soft carbon steel.

6. Rinse.

7. Cathodic deposition of nickel from one

Electrolytes with the composition:

200 g / l nickel sulfate (NiSO ₄ 7 M ₂ O),
50 g / l nickel chloride (NiCl ₂ - 6 H ₂ O),
40 g / l sodium citrate (CgH ₅ O ₇ Na, 5V ₂ H ₂ O),

the pH of which is adjusted to 2.0 with sulfuric acid, at a current density of 6 A / dm ² and a temperature of 50 ^° C. in a time of 10 seconds.

8. Rinse.

9. Cathodic deposition of zinc from an electrolyte with the composition:

320 g / l zinc sulfate (ZnSO ₄ 7 H ₂ O),
20 g / l ammonium chloride,

the pH of which is adjusted to 2.0 with sulfuric acid, with a current density of 30 A / dm ² and a temperature of 60 ° C in a time of 10 seconds.

10. Rinse and dry.

11. Dezincing in 5 percent by volume nitric acid at the manufacturer of the sheets to be enamelled at room temperature for a period of 20 seconds.

12. Rinse.

13. Enamelling.

Claims (7)

density from 3 to 10 A / dm2 in a time from 6 to n. . .., 15 see is deposited. Claims: g Method according to one of Claims 1 to 7, characterized in that on the tape or 1. Process for single-layer enamelling of a 5 sheet of bivalent iron as well as equal-band or sheet of steel, the band degreasing one or two of the metals manganese in one or sheet metal before enamelling, acid quantity of 1 to 20 g / 1 - Introduced as manganese treated, electroplated with foreign metal containing sulphate -, nickel in an amount of 10 to 50 g / l, the coatings as well as with a removable cobalt in an amount of 10 to 50 g / l ent-zinc layer, thereby marked - io holding electrolyte this bsi a current density is characterized that the strip or sheet metal to be deposited for 5 to 20 A / dm ² in a time of 10 to 30 seconds generation of a thin oxide layer in saltpeter. acid or sulfuric acid chemically or anodically
treated that on the prepared tape or sheet metal an xs that can be wiped off when wet
porous or spongy metallic layer Iron and one or two of the metals nickel, Electroplated cobalt, manganese from one or several baths at a temperature of Room temperature to 80 ⁰ C is deposited, ao being when using only one bath the bath the foreign metals nickel, cobalt The invention relates to a method for and manganese up to a total concentration layer enamelling of a strip or sheet made of steel, tration of 50 g / l can be added, and that the strip or sheet is de- Strip or sheet metal galvanically in a zinc as greased, acid-treated, galvanically with foreign metal Electrolytes galvanized in a known manner, containing coatings and with a removable is chemically provided with a 3 to 8 volume zinc layer at the consumer. percent nitric acid at room temperature Process for single-layer enameling of steel freed from the zinc layer and then sheet metal, d. H. Procedures in which there is no basic email is enamelled. 30 is used are known. With one of these 2. The method according to claim 1, characterized by the known method (cf. British patent specification indicates that the strip or sheet for production 763 379) is the sheet to be enamelled first the thin oxide layer in 3 to 8 percent by volume electrolytically degreased and after rinsing in Nitric acid chemically at room temperature 30 to water, in sulfuric acid or a mixture of Is treated for 60 seconds. 35 formic acid and nitric acid chemically or elec- 3. The method according to claim 1, thereby pickled trolytically and rinsed again. After that the strip or sheet is lytically plated with nickel in a nickel bath or a thin oxide layer in 3 to 8 percent by volume in a nickel bath and then enamelled. Nitric acid anodic at a current density of If the enameling is not carried out in a short time after ^{nickel-plating of 10 A / dm 2} at room temperature for 10 seconds, the nickel-plating process will be carried out. Sheet metal electrolytically coated with a zinc layer, 4. The method according to claims 1 and 3, which is then removed again before enamelling, characterized in that the tape or sheet A sufficient adhesion between the steel sheet is treated anodically in a bath, which is to and the enamel coating is according to this method an additional 10 percent by volume sulfuric acid (100% / ₀ ig) 45 but not reached. Notwithstanding this behavior, it is also known to drive (cf. USA.-Patent 5. The method according to claim 1, characterized in 2 748 066), after pickling and before application shows that the strip or sheet metal to produce the nickel layer undergoes a treatment in 10% the thin oxide layer is anodized in a bath of sulfuric acid at about 80 ° C to remove the is treated to carry out the 10 volume percent sulfur oxides from the surface. Instead of acid is made. The zinc protective layer can be used in this process 6. The method according to claims 1 to 5, the nickel-plated sheet are oiled. Due to the fact that on the sheet metal of this known method, however, a continuous treatment of the tapes and sheets is not possible 10 A / dm ² in a time of 10 to 30 seconds. Enamelling of metal sheets (see German patent specification and subsequently from a non-inhibited 828 626) is also an electroplating of the nickel electrolyte, e.g. B. the Wattschen or the sheet with nickel proposed, the oxidizing citric acid type, annealed at a current density of and then pickled. Instead of 3 to 10 A / dm ² in a time of 6 to 15 seconds Nickel 60 Nickel can also be deposited (cf. German Auslegeschrift. 1 017 876) cobalt or a mixture of nickel 7. The method according to claims 1 to 6, and cobalt (see. French Patent 1 286 330), characterized in that are used on the sheet or. The oxidizing annealing in the case of a strip made of a divalent iron containing relatively high temperatures and the subsequent cooling after the electrolyte at a current density of 65 in a very specific atmosphere of 5 to 10 A / dm ^a in a time of 10 to 30 seconds, however, require one thing relatively large and subsequently from a cobalt-containing effort, so that this known method of sulfate electrolyte does not satisfy the cobalt with a current. In addition to these well-known