DE1966076C3 - Indissoluble anode device for the electrical treatment of metals - Google Patents

Description

The invention relates to an indissoluble anode * device for electrical treatment. Metals, which consists of a busbar with an anode attached, the busbar being transverse extends over the electrolyte container. You cherish them

The task is based on corrosion on the conductor rail «5 ru avoid due to their service life and the uniform distribution of the thickness of the galvanic applied in the treatment of metals Layer is impaired. "« _ ,,,, "

in a known electrolytic treatment device for galvanic treatment, for example, but not exclusively in the case of electroplating or electrolytic pickling, the The anode is usually only suspended from the busbar, or it is attached using bolts or screws and nuts mechanically fastened. Fig. 1 and 2 show a known example of such an anode support part. These figures show a. Known generally used anode device in which one Conductor rail 8, which at the same time serves as a hanging bracket 4 " device for the anode 2 is attached to the upper wall edges of the electrolytic bath tank 1 ^ and in turn is held by a suspension bridge 7, while the anode 2, the screws and Nuts 9 and a stop edge attachment 10 (e.g. angle iron) are provided on their upper part, is suspended on the busbar via the stop edge attachment 10.

In this known anode device, the Anode mechanically only through a busbar

held, which also serves as a hanging or carrying Irm. With different anode materials The problem is the formation of a poorly-tending film on the anode surface connected to the busbar by the reactivity of the anode with the electrolyte, so that a non-uniform or in places even no electrical continuity occurs. For example, if steel is to be treated with chromic acid, then Use lead or a lead compound in general as the most suitable anode material. S3S

generally copper ver _{FEF of} chromic acid so £ Ά many problems on the apparatus arise DieStromzumit plated surface ver _SWEi se with chromium, N ickel or ΐ the use of copper per-Srial for the busbar whose ^ iit the mentioned metals plated J _{& danger} of chromic acid by the containing-FeS unavoidable in iSaogenen surface ° r such as pinholes or SpränSn duS the flawed points SSriöTso that the copper inside KORRO-Sf S ** above-mentioned practice ended be ^ jT iYhZ ™ "n" e for the busbar of lead or Se ^ fverwendet. However, since in this case B """" ™ _w plated bus bar metal-J ™? ¹ * _hen consistent with the anode to vertonurjscfiι gwe _elekt driven insulated film BIe.- the s' s _another's r touching Oberfia-

chroma ^ De ^ Fhltll nd Un

G diminishes

_{touch each} other

_again enter voids and Un-JJ _{in the passage of the current.}

can _{only use the} above mentioned Matena, but also

to be used or iron. At Aluuwι ^. ^^ _{χ or jn Chromsaurelo} .

_Oxvdfi i _m, whereby the flow passage ver ^ J ¹ '_{"is other hand AUC} h iron not ^^ low electrical conductivity Not _{only e} ine high supply voltage erfors ,, ^ _außertlem heat. Dert.cn wr j. _These difficulties

Task _{mentioned at the beginning} with JtT r.rrin g

^^^^ & g with the

^ _{that I}

_{Anodenmeta "verbin.} ^ _{Ano (each with the}

SeLolzen or welded. _{is described} with reference to the Ze.chnun- ^ ™ electrolytic treatment

explained.

an embodiment of the er . ^^^ SSSJ ^ m 1 is a container called "ÄSSsches Bad, which is equipped with a for an e eMroIyt.scnes d < _Alum i _niu m provided

»« ^ BSSÄ Λ ^ β «« » ^{for anode2} is the same as _β ^ _{bath surface}

and the soJgJ ^ d ^ J _container protrudes. the

can be made in one piece with a steel, connected Jgj _{di busbar}

J ^ bd »dSSoÄhen bath container 1 is outside the efcKtroiy, _{ö exist} .

so that fö * ™haben £ * V ^ _{haf th stay} ⁶ _n . ^ n ^e tog " _M Electrode Material, Die Stromscraene"> *. _the somebody

as Bleii ^ r "for B & ™ * ξ _Verschn t _e i _{m Zung}

Steel or nickel can be used. Such material

ttffliÄ " is in which no

The application of the coating layer 11 to the busbar 8 FIG. 5 shows a comparative graphical representation a pretreatment, such as cleaning the position of the electrodeposited quantities Surface of the busbar 8, advantages in the case of counterpart parts in the event of an application lateral connection of the two parts with itself, and that of the anode device according to the invention for the electrical current transfer resistance will be relocated. 5 trolytic treatment of steel and in case

The anode 2 is directly aligned with the coating layer 11 by welding or using a known electrode device melting, as shown for example in FIGS. 1 and 2 shown tiger assignment to the busbar 8 are firmly connected. The bath temperature was 15 to 70 ⁰ C, which the. The connection of anode 2 and current density was over 12A'dm ^s , and the electrolyte 8 is not based on the example mentioned ίο showed a composition of 10 to 70 g / l CrO ₃ , 1 to 0.7 g / l H ₂ SO ₄ . As the line B ' can be made for, and the coating layer 11, the application of the device according to the invention can be applied by potting. 7 shows that there was a uniform layer thickness across the cross-bridge of electrically insulating material over the entire width of the steel. On the other hand, the fastening and holding of the busbar 8 on the 15 resulted in considerable fluctuations in the bath when the known device was used, the upper edge of the container 1 for the electrolytic as line Λ 'shows. However, the busbar 8 can also be held by means of the layer thickness due to the uneven current of another support device. passage due to the influence of the electrolyte

The anode device with the features of the th.

Invention has the advantage that it is free of any- *> The busbar 8 according to FIG. 3 and 4 existed

what influences from the electrolyte or from electrolytic copper. The material of the electrode 2

same can be kept. Accordingly, and the coating layer 11 consisted of a leather

if there are no fluctuations in the passage of current, there is an alloy of 95% lead and 5% tin. They were a

nor corrosion of the device, like this in pieces in a metallic form for production

otherwise under the influence of the electrolyte is the case. »5 poured into an electrode.

Also, the electrolyte does not get through in any way. The coating layer 11 was 10 mm thick and protruded

Anode device spoiled. 500 mm beyond the outer edge of the container,

By the second of the mentioned inventive so that an uncoated section of 150 mm

As a result of improvements it is possible to change the thickness - length remained free. The busbar 8 was thus on

The galvanic layer was exposed to air over the width of the with a length of 150 mm. At

belt running through at high speed and at this point the feed line was connected to the

to avoid the shortening of the anode lifespan - using a rectifier with a power source

the one that was bound by corrosion and decomposition.

imagined busbar is caused. When using such an inventive

The invention can be applied particularly effectively to anode device for electrolytic use, if steel sheets only treated chromic acid for a short time, occurred during one is treated for less than a few seconds, for a period of more than a year no suspicion whatsoever the sheet steel as the cathode and a lead alloy. When using an anode device than the aforementioned insoluble anode in a direction that does not undermine the features of the invention Solution that had 10 to 70 g / l 40 could be used, however several difficulties were encountered Chromic anhydride and 0.1 to 7 g / l sulfur of the type described above in less than 6 months contains acid as an essential component. record.

For this purpose 2 sheets of drawings

Claims (1)

T- * Uflauflösba «: Aiwdenvorrichlung for the electrolytic Treatment of metals, consisting of Semer StrcRnschiene with attached Anode, with the busbar running across the ElektrolytbehUer extends, thereby marked that the busbar completely with the anode metal or any such metal that is fused to one another connect the anode metal cup, is coated and that the anode is fused to the clad metal