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Патент USA US2137370

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7‘ "Patented Nov. 22, 1938
1‘
2,137,370
" UN'TEnqs-mss
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2.137.370
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‘
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.
“ mnrnoo‘or COATING moNLANn STEEL .‘
‘
SURFACES.
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‘
p
_
‘_ ,Nopmw’ing;
“ Theodor Broch‘
Application‘
Unger, Fredrik5stad,»No1-wa,y
member-15, 1936‘, se-.,
, “ ‘ p .p ._
> ‘
W
rial ,No. 114,503.‘ In Great Brita‘inDecei‘nber‘
11.1935
‘
‘ ‘
‘l
i
ships‘,iship tanks-and other large containers‘lon “
haslfor its object a method ‘of ‘of
board ships or on the land,lc'omprising also steam
‘rtreatmentl OfqlI‘Ol’l‘?IldSlZEGl structures to‘ provide ‘
xboilers, ‘pipe lines and‘the like;I but the ‘use‘of
ing the corrodin‘g effects ‘of liquids and gases and ‘1the.method is ‘of ‘advantage also in‘ connection
‘ H1 “5 which is also particularly well suited to serve as . withother iron‘ and steelstructures‘, such: as build- 5
‘ “ ‘Pan unde'rc'oating forl‘paints,l varnishes, lacquers ings‘,‘ bridges, ‘masts; pillars‘; postsand the like.
same with a protective coating capable of resist- '
land the" like.
‘
‘ ‘
“ JThislinventior‘i
.
t.
.
‘
The ‘paint, lacquer or the‘1 like applied ‘as the
1
a continuation in‘ part 1'of my
“prion‘application Ser.“No."l.9;117‘?led,on April‘ 30, ‘
. “1031935 .for “a Method-of‘troikiding ‘iro‘n'a‘nd steel
‘ H-‘structureswit‘h‘ a protective coating‘.
' ‘i i
second coating on top or the solidi?ed layer of.
aqueous composition may be an ordinary paint ‘
Containing‘ ?llers or‘ ‘pigments of i any‘ suitable‘ na- . 10 ‘
ture‘gi s‘uch as'for example ‘chaikgzinc‘ white,‘ litho
"cc‘ording‘to the invention the results aimediat ‘phone‘ etc." *It has been-1'foundfl‘h‘owever, that
are*attainedibyapplying to the ‘surfaceskin‘ques- ‘ ‘titaniumjtconipounds', such‘ as titaniumdioxid‘e are
“tion‘ ‘an aqueous ‘paste comprising ‘aicompound ‘of ‘ particularlyf‘suitable as a ?ller"orlpigment~inthe
15
~15‘ a metalfwhich» is ‘above iron'in' the electroniotive ‘second coating composition. I
The-‘ordinary commercial‘ titanium paints ‘(con- “
‘.lser‘ies ‘of ‘the ‘metals together ‘with. a “compound
capable of ‘forming complex compounds ‘withiron. taining titanium" ‘oxide with orwithout‘ other ‘pig;
=1‘ PWhen-acomposition‘ of this character is main» ments or ?llers such‘ as zincx'white; lithophone,
“tained‘ in“ contact-with the iron ‘surface ‘for some chalk etc.) ‘have proved‘to give‘ei-icellent ‘results
I
time, iron ions will enter into‘ solution‘ and'form
. a‘complex iron compoundyfw‘hile‘the metal above
in cor‘nbin ‘tiori
‘ing compositio
‘
thelabovers‘peci?ed ground- ‘.120
“ ‘ ,ironinthe electroniotiveseries. will be deposited‘ ‘
on the. iron surface ‘in‘la metallic ‘condition (by
1“cementation_"1_)-. .
“ ‘_ “25 ‘ ‘The. metal above‘irj‘on
‘the electromotive series
iiasar‘uaua ‘with ai‘smscs‘treat: 450 .105
‘ which is» ‘asnecessary: constituent“ of the . composi
‘ Ltion‘may be i for ‘example ‘zinc,,chromiunnmagne
vsiuin many other‘ metal below magnesium in the
‘ . ‘electrom‘otive series. This metal maybe present
3p infhe‘ composition as a salt orvasyan oxideonas
‘“
.
The‘ compound capable of’ formingmomples
..____t_r-t____s 15
‘ ‘oompounds‘with ‘ironlmay‘tf‘orlexample be a phos
.Hphate such as monocalciurn phosphate‘ _o1_' “altar u‘ ‘ ,‘The coatingsolidi?cd inithe course lofmzfiihours.
‘ Q35 ‘Qt‘rate ‘ ‘;‘(/such;‘ as sodium‘ or potassiumfitartrate) jor ,‘Qn‘top ofstheso obtained coating," 9. layer. of» an .35
‘an acetate‘ ‘(such‘aslsodium ortpotassiurn acetate) ‘ oil paint ‘ containing“. titanium ‘pigment ‘was ap
. ...or.lthe‘ ‘likes,In?a‘dditiontothe saidsubstances plied.‘ ; The structure was maintained ‘in contact
1
the composition preferably also.‘ ‘ ontainstanqalkali
. “metalsalt or. other good‘ electrolyte“, ~
J49“
“ "
vI-n order to produce asuit blelcon‘sisteincy to
‘make the composition readily‘ap‘plicable by. brush;
‘ ing‘.,sprayingxorrlike;methods. the composition
‘ will usually be given an ‘addition of some ?ller
such ‘as kieselguhr, clay, starch or the like.
45
In order to‘produce‘ a protective coating on the
‘
‘
iron‘ or‘. steel ‘surface in question, a coating of ‘ a ‘
composition of the above speci?ed nature is ap
with sea water. for more: than ‘3 monthso» ‘No
formation 5 of“ “rust could_;.be detected . as“ a ‘ result
of this.
The effect or the treatment may bel40
‘.explainedlas follows;
a i i
‘
l. The ‘zinc ‘oxide and» a.‘ part] of; themono-calcium
phosphate react to form a zinc phosphate and
‘tricalcium phosphate. The excess‘ of mono- 7
calcium phosphate reacts‘with iron‘ and rust to 45“
‘form insoluble ‘iron phosphate. At thesame time“
metallic zinc is deposited on the iron. A saturated
“ plied to the surface and‘ then left to ‘solidify, “ solution of zinc phosphate is in fact present to-‘
“ whereupon a suitable paint, lacquer, varnish, oil gether with a compound capableof forming a
‘.50. or ‘the like is applied on top of the ?rst coating.
'
. ‘The resulting “compound coating‘adheres very
complex salt; This ‘compound combines‘with the 50 '
iron ‘(equivalent to the deposited zinc) ‘which will
‘strongly to the surface and protects the surfaces ‘ enter into‘solution. The coating of paste further
acts ‘as a constant store for further reaction as
for a very long time.“
i
w
a‘
above in proportion as‘. a part of the coating is‘
The method is of particular advantage in‘ con
‘ 55 nection with ‘ships and constructional equipment
‘
dissolved in water, and Iorms" a comparatively 55
Q, 1 87,870
saturated solution reacting as above explained.
'72 parts of monocalcium phomhate (commercial
quality), 4 parts of dextrine and 75 parts of
There is thus constantly av direction of flow
which brings about deposition of metallic zinc.
water. After drying, two coats of the same
titanium white-oil paint as above‘ were applied.
One of these samples was placed half immersed
in sea water, and the other one in open- air in
an oblique position. After four months, both of
Sample I!
_
iron surface was coated with a paste con
‘ taining zinc chloride, mono-calcium phosphate
I and
I’ The paste consisted of :
»
Zinc
'
the samples in open air were found to be in good
condition, while the red lead-coated sample im
' Parts by weight
chloride ________________________ ____
mersed in sea water was found to be highly
damaged. The other sample placed in sea water
was in an entirely sound condition.
25 ,
' Calcium monophosphate (CaLHdPOOa) ___..
60
Kleaelguhr ............. __, __________ __'-'.=.;
30
Water ________________________ _.' _______ __
‘ 20
Example VI
The pastewas prepared by the aid'of sea water as >
. A large iron plate in a thoroughly rusty condi
a vehicle. The ‘coating was left to dry and was . tion was freed from loosely adhering rust by
I then coated with a layer of an oil paint. v “
_ beating and then cut into pieces and treated ex
Emmple II!
actly‘ as in Example V. After about four months
the vsamples were inspected. The results were
An 1m‘ tank. which after emptying has been‘ exactly as in Example V with the only difference
brushed to remove loose, rust, i! brushed over ‘that the red lead sample in sea water was found
;(one time or several times). with a, paste, pro
to be in a still more'damaged :condition than
duced by stirring 10 parts by weight .of zinc according
to Example V.
.
I
chloride and 20 parts by weight‘ of potassium
tartrate‘ in about 170 parts by weight of . water.
‘
When dry the ‘resulting coatingwas covered
‘by aliayer of an oil paint. .
l.
.
"will!"
v
Esa'mplevVH
An iron plate (scrap. iron) having large rust
cavities was freed from loosely adhering rust,
while the main partvof the rust was-left on the
’
plate. a The plate was cut into. pieces, and the
[A numberof-iron pistes was brushed over with
pieces treated as in Example V. After four
months the samples were, inspected. The red
lead sample in open air showed a beginning de
terioration, in that the rust spots had pene
monocalcium' phosphate, various. other Phosphates ,trated through the paint. The other open air
"such as phosphates of ‘aluminium-titanium, sample was inan entirely sound condition; The
munslum. strontium.
barium. {time mm red lead sample in sea waterwas highly damaged,
'o
found to have thesame
set forth in largeblisters having been formed on the surface.
' ‘the above- examples.
The other sample, treated with the aqueous paste
pastesabove mentioned ‘I were ‘also. em and
placed in, sea water showed no signs of de
coat u-on surfaces of large dimension,
which had previously been freed from loosely ad
40
pastesofthe above type. some contain~
ing sine phosphate'andothers ‘containing nine
1 oxide.‘ but. having asa constituent
of
terioration.
herlng rust. After thepaste coating had solidi
-
fled the surfaces were treated asvusual with one
‘
_
1
;
,
I
v
'Emm?e-V!"
,.
.
-
a
'A' ship's nun‘ was coated; with‘ a paste of the
same composition as in Example V. After some
days the surface below the water line was coated
, or. two coats of paint. Itwas found that onthis
‘almost theipaint produced a yveryykeepingcoat
' with an ordinary bottom paint. - Above the water
“
"the course of‘the various experiments it has
been found that the paste functions as a satis
line a grey'oll paint was applied.‘ ‘Part of the
work was ‘done-fat temperatures of about 8° 0.
‘ “factor!
we‘titute for the'oonventional base coat
,
below ‘zero, while the rest of the work was done
H
'
a
sample
vv
‘
I
a
A. large-newiron plate with roller scales was
cut into comparatively 0 large pieces. Two of
the ‘pieces were painted with one coat of ordinary
' "as
at temperatures above zero in moist air. - After
eight‘lmonths," the surface 'was in an entirely
.
red lead.“ when this ‘coast was dryftwo‘ coats of
sound condition‘ with no signs of rust.
I
was‘plaeed‘in open air in an‘ oblique posi
Two other pieces oi’ the plate were'coated with
‘a paste
of
parta‘o'f‘
chloride,
'
'
"
‘
'
‘
Method ‘of protecting iron‘ andv steel structures
against corrosion whichcomprises preparing an
aqueous zinc depositing paste by incorporating
zinc oxide and monocalcium phosphate into an
‘ordinary painters oil with titanium white (Stand
YA)‘ were applied. "One of ‘theisamples' was
‘immersed with one. hall'- in sea water". The other
claim:
aqueous liquid, applying a coating of the some
pared‘aqueous paste to the iron surface to‘ be
protected, and leavingthe so applied coating on
the iron surface in a moist condition at ordinary an
temperature until-the coating has solidified.
'
-
THEODOR BBOCH'UNGER. '
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