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Патент USA US2124261

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Patented ‘July ‘19, 19.38 v
7 r 2,124,261
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ML-Ma'NUFAoTUREI on memories"
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“ jsynai'aniatainnph, tint Pleasant; wanaa' ‘
i p I _ worth‘,.London,\ England,‘ as'signor' to The Alu
‘ minum Plant‘ and ‘Vessel Company. Limited,
“Point Pleasantrwandsworth,London;y-England
‘ ApplicationfFelii-uary s, 1936, semi no; 52,711
v, ‘ bgrnoreai Britain February 6, 1935.‘:
l I‘; ‘This invention lrelateisljitomthe manufacture‘ of "
" ‘_
out its length, thereby ensuringthat, the current
‘ “ YeIectmdesand has ‘particular 'referencegto the ; density , shall , remain ‘substantially constant * not;- I
1 ‘ij_.manuiacture oi, electrodes. which are‘ composed withstanding Ithev fact"v that \liquid circulating
‘of‘relatively. expensive‘ or valuable 'metals?ffor "openings arelthu'sprovided; vIn order‘toprovide -
‘instance; nickelland which are required to' carry
avgood ‘electrical connection between the‘two'ele-l
‘ {elements
ments, oithe
oi copper‘or
other relatively'inexpensive‘
ring-like‘element_orv .; ‘
‘ Such electrodesare used? in connection with
‘the ‘electrolysis’ of liquids,‘ as, “for example, in the . metal is“ preferably cast,welded’orsilver-soldered
production of metallic‘sodium from caustic soda ‘ in position‘ 'onlthe‘upper end‘ of ‘the ?ared part 10'
heavy electric currents."
‘; H
, ,L 1
“M10 and they. are usually fermedyby casting~
' i i g ‘castings are relatively'expensive to machine all
connection it‘ has been ‘found that owing to the " H
. but
the maehininc‘nqt
an even ‘necessary
Of . “searching
arising ine.or
use caustic,
of the‘electrode,
soda, of
elec- 1 ‘i
‘l‘jl?‘ that the‘ surface ofthe electrode ‘shall be parallel‘
of the body'lporti‘on of the electrode. ‘.Ingthis‘ I
“ . jgwith its ‘neighbouring electrode.
means, such as riveting ‘jor bolting, of" the, two‘ 15 i
Furthermore,‘ parts of the electrode are unsuitable as it has
‘ '
i ‘l I] ‘it 118$ been found dif?elllt t0 ensure that‘Such vbeen found [that thevelectrical contact becomes ‘
I j ‘ castings are free from‘ blowholes, porous places’ progressively ‘ worsej j under operating conditions ‘
‘ ‘; and'oxide‘ inclusions and experience has shown ‘ owing tothe gradual seepage'of the electrolyte ‘
‘ ‘20 that such'eastings Often breakdown prematurely‘ between such mechanically united surfaces, par--, 20
;. ‘11h use Owing to such defeets- Inthis‘ Connection hticularly in instances where spray is carried above
,it must be borne in mind that‘s‘uch porous places
4 ‘ or blow holes left in the machined casting’ vgive
rise to process troubles due to the reduced effec-
the surface of the electrolyte.‘ *
’ ‘ ‘
i i
In order that the said invention may be clearly“
understood and readily carried into e?‘ect’ the,’ .
25 ‘ tive current-carrying capacity of the ‘particular same will now, be more fully described with ref; .25
‘ “Part Of the Section at which they 066111‘ and thus erence to the accompanyingdrawing, in which:-,
the e?ective current density from one electrode‘ “ Figs_ .1 and z'show respectively in vertical sec
‘ to another is less thanin‘suchplaces Where the tional elevation and‘ in plan an electrode pro- . '
"1 ‘
. “ ‘metal is‘ free from Such defects-
' +130
The electrode shown in the accompanying 30.‘
to provide an improved and simpli?ed method , drawing is made'up of a hollow cylindrical body ‘
t of forming such electrodes and an improved form
of electrode which is less expensive vand which
at the same time possesses the conductivity and
' other attributes necessary for enabling the same
to be used for electrolysis and, similar purposes.
- duced in accordance with the present invention. '
The emef Object ‘ofv the present invention is
portion a composed of the relatively expensive“
metal such as nickel and a-surmounting ring
like element b composed of ‘the less expensive
electrically conducting metal such as copper. A1; 35
its upper end the body pol-tic“ is provided with
A0601‘ ding to the“ inventlonthe Improved form ‘ a‘ series of circumferentially spaced slits,’ slots
‘ . of electrode ‘is composed of two parts, to'wit,v a
hollow cylindrical body DOI‘tiQII ‘composed 05 a
or openings 0 to permit the liquid under treat‘.
ment to pass therethrough and'is ?ared outward-. ' r
‘ ‘i 40‘ relatively expensive metalfslleh'ae; nickel, and \ ly in, the manner shown, the effective current“;0
'9' surmounting ring-likeelement vunited as, for carryingi‘cross sectional area of the electrode re
example; by fusion’. Weldme orihellke' wlth the‘ Pmaining substantially“ constant throughout its
" ‘ “Pper end ‘Pf the body poljtlon and. composed 0i a
‘less expenswe good 'electncally‘conducting‘metal’
4‘5 such as copper‘ the ‘cylindrical body portion be"
ing preferably formed‘ofsheet metal having suit‘
ableiliquidnoirculating openings formed therein.
length. The hollow cylindrical body portion may» ’
be out from a metal tube but for economical'reaé ‘ ‘ '
sons it is preferably formed'from a ?at sheet of 45
metal] which is rolled or curved so that its oppo_
‘_ b
ht t
> “it b1
> In carrying the invention into effect according 5 e
885 are‘ mug
oge er ‘any ‘5 a y
to one convenient mode, the hollow cylinder of ' joined P51 for example’ by ‘welding’ the welding ‘
50 sheet metal is formed at its upper end'withia, ‘ extendmg only to the lower end of that Portion 50,
“ ‘series of circumferentially spaced slits, slots or" of the body which 18 ‘Subsequently ?ared-~ ' BY
openings and the'slitted,‘ slotted or apertured end providing the upper part0! the cylinder 0r ?at
is‘?ared outwardly in such a manner that the sheet with a seriesrof, slits or slots. the Subse- ‘’
’ 55
‘ effective current-carrying‘ cross-sectional area of
quent ?aring oi the upper end of the'cylinder
‘I the electrode is substantially-constant through
‘results in the formation of the desired liquid cire
' culating openings, without loss of cross sectional
‘ conducting area.
The surmounting ring-like element of copper
or the like is cast, welded or silver-soldered in
positionon the upper end of the ?ared part of
the body portion of the electrode or on the
less. Moreover, from the point of view of mount
ing or assembly, di?loulties involved in connect
ing up the electrodes with a source of electric
supply are largely overcome as it is a relatively
simple matter to form a good electrical connec
tion with the copper ring as compared with that
01' obtaining a good electrical connection with the
tongues between which the aforesaid openings
are formed. If desired, the area of contact and, upper part of a nickel electrode. Other advan
the anchorage between the two elements may be tages will be apparent to those skilled in the art.
Having thus described this invention what I 10
10 increased or improved by providing the’ tongues
with a series of pins or other protuberances which > claimas new ‘therein’ and desire to secure by Let
are embedded in the ring-like. element or ele
ters Patent is:-,,
‘A bi-metallic electrode for use in the electroly-~
From the foregoing it will be appreciated that: sis of' caustic alkalis, consisting of a liquid im
15 the two-part, two-metal electrode produced in
mersion part in the form of a hollow cylindrical 15
body portion composed of nickel and a surmount
many advantages over the one-piece cast nickel ing ring-like part composed of copper, the upper
electrodes used hitherto. In the ?rst place, it is end of the nickel body portion, being ?ared out
accordance with the present invention possesses
free from the drawbacks inherent with any form > wardly and of constant cross-sectional area and
'current'carrying capacity, said upper end being 20
20 of casting when used for electrolytic and like pur
poses and, secondly, ‘the costs can be materially
reducedsince not only does the invention enable
sheet metal to ‘be utilized for the formation of
therelectrode, thus saving machining and scrap,
25 but, owing to the use of a copper or like sur
mountingring, the mass of the more expensive
‘ material, for‘ instance, nickel, used'is considerably
‘formed with a series or liquid circulation open
ings constituted by circumierentially spaced slits
which, by the ?aring, have the‘form oi’ slots, and
the ring-like part'oi copper being united'by fusion
with the upper end of the outwardlyv ?ared part 25
' of nickel.
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