NO136228B - - Google Patents
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- NO136228B NO136228B NO3462/73A NO346273A NO136228B NO 136228 B NO136228 B NO 136228B NO 3462/73 A NO3462/73 A NO 3462/73A NO 346273 A NO346273 A NO 346273A NO 136228 B NO136228 B NO 136228B
- Authority
- NO
- Norway
- Prior art keywords
- corrosion
- capric acid
- metal
- vapor
- objects
- Prior art date
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- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 claims description 62
- 238000005260 corrosion Methods 0.000 claims description 38
- 230000007797 corrosion Effects 0.000 claims description 32
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 claims description 31
- 229910052751 metal Inorganic materials 0.000 claims description 31
- 239000002184 metal Substances 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 19
- 239000000126 substance Substances 0.000 claims description 13
- 239000003112 inhibitor Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 description 11
- -1 amine carboxylates Chemical class 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 10
- 239000000123 paper Substances 0.000 description 9
- 150000007513 acids Chemical class 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000003921 oil Substances 0.000 description 7
- 239000012808 vapor phase Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical class CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910001369 Brass Inorganic materials 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010951 brass Substances 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000005639 Lauric acid Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
- 239000005457 ice water Substances 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000011814 protection agent Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 229920002955 Art silk Polymers 0.000 description 1
- 239000005635 Caprylic acid (CAS 124-07-2) Substances 0.000 description 1
- 229920000298 Cellophane Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910000318 alkali metal phosphate Inorganic materials 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- HXJOEVTXZQOPIT-UHFFFAOYSA-N decanoate;methylazanium Chemical compound [NH3+]C.CCCCCCCCCC([O-])=O HXJOEVTXZQOPIT-UHFFFAOYSA-N 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910001960 metal nitrate Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229960002446 octanoic acid Drugs 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000011101 paper laminate Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/023—Containers for magazines or cassettes
- G11B23/0233—Containers for a single cassette
Landscapes
- Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
- Packages (AREA)
- Automatic Tape Cassette Changers (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
Fremgangsmåte til å hindre korrosjon av metallgjenstander ved hjelp av stoffer som i dampform virker korrosjonshindrende. Procedure to prevent corrosion of metal objects by means of substances which, in vapor form, have a corrosion-inhibiting effect.
Foreliggende oppfinnelse angår en The present invention relates to a
fremgangsmåte til å hindre korrosjon under anvendelse av den i og for seg kjente method to prevent corrosion using the known in and of itself
forholdsregel som består i å omslutte metallgjenstander eller gjenstander hvis precaution consisting in enclosing metal objects or objects if
overflate er av metall, med et innpakningsmateriale, sammen med et stoff som surface is metal, with a wrapping material, together with a substance that
1 dampformig tilstand virker korrosjonshindrende. Dette innpakningsmateriale 1 vapor state works to prevent corrosion. This wrapping material
kan være av celluloseholdige stoffer eller can be of cellulose-containing substances or
av stoffer inneholdende cellulosederivater. of substances containing cellulose derivatives.
Under lagring, håndtering, transport During storage, handling, transport
og for konservering av metallgjenstander and for the conservation of metal objects
eller gjenstander med metalloverf later, or objects with a metal surface,
særlig gjenstander av stål, aluminium, kobber og messing, er det ofte nødvendig å especially objects made of steel, aluminium, copper and brass, it is often necessary to
hindre korrosjon av disse metaller. I forskjellige hittil kjente metoder på området prevent corrosion of these metals. In various previously known methods in the area
anvendes der forholdsvis kostbare midler relatively expensive means are used there
som i dampform virker korrosjonshindrende, f. eks. amin-karboxylater eller amin-nitriter. which in vapor form acts as a corrosion inhibitor, e.g. amine carboxylates or amine nitrites.
Der er tidligere foreslått i innpakningsmateriale som papir å anvende forskjellige It has previously been proposed to use different packaging materials such as paper
stoffer som i dampform forhindrer korrosjon av metaller. I US patentskrift nr. substances which in vapor form prevent corrosion of metals. In US patent document no.
2 824 782 åpenbares således anvendelsen av 2 824 782 thus reveals the application of
alkalimetallsalter av C(i - C1B-fettsyrer, alkali metal salts of C(i - C1B fatty acids,
blant annet av kaprinsyre, for dette formål, among others of capric acid, for this purpose,
idet der angis at de frie syrer ikke, eller i where it is stated that the free acids do not, or i
liten grad, har korrosjonshindrende virkning. I US patentskrift nr. 2 848 298 fore-slåes for anvendelse til samme formål to a small extent, has a corrosion-preventing effect. US Patent No. 2,848,298 is proposed for use for the same purpose
blandinger som består av et metallsalt av mixtures consisting of a metal salt of
en C(. - CU)-alkansyre, hvoriblant er nevnt a C(. - CU)-alkanoic acid, among which are mentioned
kaprinsyre, et metallnitrat og et di-alkali-metallfosfat. Der nevnes i patentskriftet at capric acid, a metal nitrate and a di-alkali metal phosphate. It is mentioned in the patent document that
stoffer av de to førstnevnte grupper ikke ansees å være anvendbare i dampform som korrosjonshindrende midler, og at den i patentskriftet angitte effekt skyldes kom-binasjonen av stoffene, altså er en syner-gistisk virkning. substances of the two first-mentioned groups are not considered to be usable in vapor form as corrosion inhibitors, and that the effect stated in the patent document is due to the combination of the substances, i.e. a synergistic effect.
Andre kjente metoder omfatter be-legg av de metaller som skal benyttes med oljeaktige stoffer inneholdende korrosjonshindrende midler som virker bare ved kontakt. Under visse betingelser er der brukt oljer inneholdende korrosjonshindrende stoffer som blir flyktige ved høyere temperaturer, og hverved danner en korrosjonshindrende atmosfære over oljen som be-finner seg i et lukket rom med metallveg-ger, f. eks. i en veivkasse eller lignende. De ulemper og begrensninger som er forbundet med slike metoder er åpenbare. Først og fremst må i de fleste tilfelle metallgjen-standene renses før sådanne oljeaktige korrosjonsbeskyttende media, deriblant de nevnte oljer, kan anvendes. Ennvidere mas-kerer eller minsker nærværet av oljer ofte effektiviteten av det korrosjonshindrende middel i oljen. Det er da nødvendig å «aktivisere» korrosjonshindrende midler i smøreoljer ved å innføre andre materialer, som svovelholdige forbindelser, fenolfor-bindelser og/eller polykarboxylsyrer, deres amider eller estre. Alle disse forholdsregler øker selvfølgelig omkostningene ved anvendelsen av de korrosjonshindrende midler, og omkostningene blir ennu større, da det er nødvendig å fjerne oljen eller den oljeaktige substans fra metallgjenstanden før den skal brukes. Other known methods include coating the metals to be used with oily substances containing corrosion-preventing agents which only work on contact. Under certain conditions, oils containing corrosion-preventing substances are used which become volatile at higher temperatures, thereby forming a corrosion-preventing atmosphere above the oil which is in a closed room with metal walls, e.g. in a crankcase or similar. The disadvantages and limitations associated with such methods are obvious. First and foremost, in most cases the metal objects must be cleaned before such oily corrosion protection media, including the aforementioned oils, can be used. Furthermore, the presence of oils often masks or reduces the effectiveness of the anti-corrosion agent in the oil. It is then necessary to "activate" corrosion-preventing agents in lubricating oils by introducing other materials, such as sulphur-containing compounds, phenolic compounds and/or polycarboxylic acids, their amides or esters. All these precautions naturally increase the costs of using the anti-corrosion agents, and the costs become even greater, as it is necessary to remove the oil or the oily substance from the metal object before it is to be used.
Når delvis eller fullstendig lukkede 1 metalldeler anbringes, innpakkes, omslut-tes eller lagres i beholdere, skjer dette i alminnelighet under slike betingelser at vanndamp og luft enten er tilstede eller føres inn til metalldelene i beholderen, el- i ler at vanndamp sammen med luft trenger inn i beholderen gjennom dens vegger efter forpakningen. When partially or completely closed 1 metal parts are placed, wrapped, enclosed or stored in containers, this generally takes place under such conditions that water vapor and air are either present or introduced to the metal parts in the container, or that water vapor together with air penetrates into the container through its walls after packaging.
Foreliggende oppfinnelse har til formål å eliminere de nevnte og andre ulemper og å skaffe nye produkter som kan brukes alene som omslutnings- eller innpakningsmaterialer eller som bestanddeler av sådanne. Disse nye materialer er istand til å hindre korrosjon av metalldeler lag-ret eller anbragt i beholdere eller inn-pakningsmidler, og/eller korrosjon av me-tallbeholdere som inneholder de nye materialer. The purpose of the present invention is to eliminate the aforementioned and other disadvantages and to provide new products that can be used alone as wrapping or wrapping materials or as components of such. These new materials are capable of preventing corrosion of metal parts stored or placed in containers or packaging means, and/or corrosion of metal containers containing the new materials.
Foreliggende oppfinnelse angår altså en fremgangsmåte til å hindre korrosjon av metallgjenstander eller gjenstander med metalloverflater ved å omslutte sådanne gjenstander med et innpakningsmateriale sammen med et stoff som i dampform virker korrosjonshindrende, og det karak-teristiske trekk ved oppfinnelsen er at man som korrosjonshindrende stoff anvender kaprinsyre, fortrinsvis i mengder mellom 0,55 g og 55 g pr. m2 av innpakningsmaterialet, og at temperaturen av den inn-pakkede gjenstand holdes mellom ca. —1° C og 42° C. The present invention thus relates to a method for preventing corrosion of metal objects or objects with metal surfaces by enclosing such objects with a wrapping material together with a substance which acts as a corrosion inhibitor in vapor form, and the characteristic feature of the invention is that capric acid is used as a corrosion inhibitor , preferably in amounts between 0.55 g and 55 g per m2 of the wrapping material, and that the temperature of the wrapped object is kept between approx. -1° C and 42° C.
Ved høyere temperaturer går av ukjen-te grunner den korrosjonshindrende virkning tapt. Dette kan ikke forklares med damptrykket, da damptrykket av kaprinsyren ved —1° C til 42° C selvsagt er la-vere enn f. eks. ved 65° C. At higher temperatures, the corrosion-preventing effect is lost for unknown reasons. This cannot be explained by the vapor pressure, as the vapor pressure of capric acid at -1° C to 42° C is of course lower than e.g. at 65°C.
Kaprinsyren utgjør ikke alene et bil-| lig, i dampform virkende, korrosjonshindrende middel i sammenligning med andre fettsyrer, men den utgjør også det mest effektive dampformige korrosjonshindrende middel for lagring og beskyttelse av metalldeler ved omgivelsenes temperatur i sammenligning med de nærmestliggende homologe forbindelser. Capric acid does not alone constitute a car-| equal, in vapor form, anti-corrosion agent in comparison with other fatty acids, but it also constitutes the most effective vapor-form anti-corrosion agent for storage and protection of metal parts at ambient temperature in comparison with the closest homologous compounds.
Oppfinnelsen kan realiseres eller brukes på forskjellige måter som adskiller seg bare i detaljer, men som omfatter de vesentlige trekk ifølge oppfinnelsen. Således kan kaprinsyre innføres ved impregnering av forskjellige innpakningsmaterialer, såsom papir, cellofan, polyetylenfilmer, kor-rugerte plater, stoffer og lignende, som kan være enten delvis porøse, eller absorberende, eller fullstendig ugjennomtrengelige stoffer. Fortrinsvis velges det et fast ma- The invention can be realized or used in different ways which differ only in details, but which include the essential features according to the invention. Thus, capric acid can be introduced by impregnation of various packaging materials, such as paper, cellophane, polyethylene films, corrugated sheets, fabrics and the like, which can be either partially porous, or absorbent, or completely impermeable substances. Preferably, a fixed ma-
;eriale som har filterstruktur slik at kaprinsyre blir absorbert mellom de indi-viduelle fibre av bæreren. Når bærerma-terialet ikke er særlig absorberende kan let fordelaktig belegges eller impregneres med syren. ;erial which has a filter structure so that capric acid is absorbed between the individual fibers of the carrier. When the carrier material is not particularly absorbent, it can advantageously be easily coated or impregnated with the acid.
En av fordelene ved oppfinnelsen ligger i uavhengigheten overfor egenskapene av omgivelser i hvilken syren er meget effektiv som korrosjonsbeskyttende middel. Ved mange typer av dampformige korrosjonshindrende midler er det f. eks. nød-vendig at innpakningsmaterialet enten er nøytralt eller lett basisk. Dette er ikke tilfelle med kaprinsyre. Dessuten blir mange materialer, f. eks. messing eller kobber, flekket eller selv korrodert med aminer. Som følge derav er aminer eller amin-nitriter ikke alltid egnet som korrosjonshindrende midler for slike materialer. I motsetning dertil er kaprinsyre fullstendig tilfredsstillende som korrosjonshindrende middel for kobberholdige metaller og for jernholdig metall, såsom stål og jern. One of the advantages of the invention lies in its independence from the characteristics of the environment in which the acid is very effective as a corrosion protection agent. With many types of vapor-based corrosion inhibitors, there is e.g. it is essential that the wrapping material is either neutral or slightly basic. This is not the case with capric acid. In addition, many materials, e.g. brass or copper, stained or even corroded with amines. As a result, amines or amine nitrites are not always suitable as corrosion inhibitors for such materials. In contrast, capric acid is completely satisfactory as a corrosion inhibitor for copper-containing metals and for ferrous metals such as steel and iron.
Typiske eksempler på faste stoffer som kan brukes i forbindelse med kaprinsyre for formålet er papir, tekstilstoffer som bomull, ull eller silke, tre modifisert eller stivnet papir, f. eks. papp, fiberplater og laminert papir, syntetiske fibre eller spundne tekstilmaterialer, f. eks. kunst-silke, polyestere, polyamider, nylon og po-lyetylen, asbest, trekull, aktivert trekull, aluminium-oxyd-gel, og siliciumoxyd-gel som kan impregneres med kaprinsyre og brukes i forbindelse med et innpakningsmateriale. Et ark eller strimmelmateriale bestående av de ovenfor nevnte fiberstof-fer kan brukes for å fremstille gjenstander ifølge oppfinnelsen. Impregneringen eller avsettingen av kaprinsyre på de ovenfor nevnte faste materialer kan skje ved fukt-ning, neddykking eller gjennombløtning av materialet med en dispersjon eller opp-løsning av kaprinsyre, fortrinsvis i et forholdsvis flyktig organisk oppløsningsmid-del. Impregneringen kan også utføres ved å fordele en smelte av kaprinsyre, med eller uten et smeltepunktssenkende middel på overflaten av det faste bærerma-teriale. De fibrøse materialer kan også impregneres ved kontakt med kaprinsyre. Typical examples of solids that can be used in conjunction with capric acid for this purpose are paper, textiles such as cotton, wool or silk, wood modified or stiffened paper, e.g. cardboard, fibreboard and laminated paper, synthetic fibers or spun textile materials, e.g. artificial silk, polyesters, polyamides, nylon and polyethylene, asbestos, charcoal, activated charcoal, aluminum oxide gel, and silicon oxide gel which can be impregnated with capric acid and used in conjunction with a wrapping material. A sheet or strip material consisting of the above-mentioned fibrous materials can be used to produce objects according to the invention. The impregnation or deposition of capric acid on the above-mentioned solid materials can take place by moistening, immersing or soaking the material with a dispersion or solution of capric acid, preferably in a relatively volatile organic solvent. The impregnation can also be carried out by distributing a melt of capric acid, with or without a melting point lowering agent, on the surface of the solid support material. The fibrous materials can also be impregnated by contact with capric acid.
Det er i mange tilfelle fordelaktig å behandle eller impregnere ett eller flere lag av papirlaminat med kaprinsyre og derefter omarbeide dem til et ferdig laminert materiale som er forsynt med ytter-lag som er meget mindre porøse og mindre gjennomtrengelige for dampene av det korrosjonshindrende middel enn de impregnerte laminater som brukes for det indre av innpakningen, eller som blir anbragt i nærheten av det korroderbare metall. I disse tilfelle kan det ytre laminat bestå av en metallfolie, f. eks. tinn eller aluminium, fortrinsvis med slik tykkelse at det ikke oppviser hull. Lignende resul-tater ble oppnådd ved å belegge en side av det med kaprinsyre impregnerte papir med en voksfilm. It is in many cases advantageous to treat or impregnate one or more layers of paper laminate with capric acid and then rework them into a finished laminated material which is provided with outer layers which are much less porous and less permeable to the vapors of the anti-corrosion agent than the impregnated laminates used for the interior of the packaging, or placed near the corrodible metal. In these cases, the outer laminate can consist of a metal foil, e.g. tin or aluminium, preferably with such a thickness that it does not show holes. Similar results were obtained by coating one side of the capric acid impregnated paper with a wax film.
Et overraskende trekk ved oppfinnelsen består i den uventede forskjell mellom virkningen av nær beslektede fettsyrer som dampformige korrosjonshindrende midler, når de blir fordampet fra papir eller annet innpakningsmateriale, sam-menlignet med den virkning som oppnåes når syrene er dispergert i et oljeaktig medium. I sistnevnte medium er den oppnådde korrosjonsbeskyttelse vesentlig den samme for en rekke av forskjellige fettsyrer, idet det ikke ble funnet større forskjell mellom nær beslektede homologer av kaprinsyre. Når imidlertid mediet er i det vesentlige «tørt», dvs. et medium i hvilket der ikke i det vesentlige finnes olje eller annen væske, er den korrosjonshindrende effekt i dampfasen av kaprinsyre kritisk. Dette kan sees av eksemplene, i hvilke kaproin- og kaprylsyrer sammenlignes i deres korrosjonshindrende virkning i dampfasen med kaprinsyren. Der kan sees at kaproin- og kaprylsyrer faktisk aksel-lererer rustdannelsen, mens laurinsyren (den neste, høyere homolog av kaprinsyre) bare har en begrenset virkning ved omgivelsestemperaturen under de betingelser i hvilke forsøkene ble utført. Sam-menlignet med disse syrer, er det blitt funnet at kaprinsyre er meget effektivt når det metall som skal beskyttes er jern, stål, kobber eller messing. Oppfinnelsen er således basert på den uventede forskjell mellom disse syrer i en ny omgivelse som er helt forskjellig fra de omgivelser i hvilke syrene tidligere eventuelt ble brukt. Den her nevnte fordel av kaprinsyren ligger ikke bare i dens ypperligere korrosjonshindrende virkning i dampfasen, men også i den kjensgjerning at den er betydelig billigere enn andre dampformige korrosjonshindrende midler, såsom amin-nitri-ter eller aminkarboxylater. A surprising feature of the invention consists in the unexpected difference between the effect of closely related fatty acids as vapor corrosion inhibitors, when they are evaporated from paper or other wrapping material, compared to the effect obtained when the acids are dispersed in an oily medium. In the latter medium, the achieved corrosion protection is essentially the same for a number of different fatty acids, as no major difference was found between closely related homologues of capric acid. However, when the medium is essentially "dry", i.e. a medium in which there is essentially no oil or other liquid, the corrosion-preventing effect in the vapor phase of capric acid is critical. This can be seen from the examples, in which caproic and caprylic acids are compared in their corrosion-inhibiting effect in the vapor phase with capric acid. It can be seen that caproic and caprylic acids actually accelerate rust formation, while lauric acid (the next, higher homologue of capric acid) only has a limited effect at ambient temperature under the conditions in which the experiments were carried out. Compared with these acids, it has been found that capric acid is very effective when the metal to be protected is iron, steel, copper or brass. The invention is thus based on the unexpected difference between these acids in a new environment which is completely different from the environments in which the acids were previously possibly used. The here-mentioned advantage of capric acid lies not only in its superior corrosion-inhibiting action in the vapor phase, but also in the fact that it is considerably cheaper than other vapor-form corrosion-inhibiting agents, such as amine nitrites or amine carboxylates.
Det er funnet at kaprinsyre bare er effektiv ved temperaturer mellom ca. —1° C og ca. 42° C. Ved høyere temperaturer blir antagelig andre fenomener fremher-skende, fordi kaprinsyren ikke da danner et effektiv dampformig korrosjonshindrende middel, mens flere av de ovenfor nevnte syrer var i det minste delvis effektive. It has been found that capric acid is only effective at temperatures between approx. -1° C and approx. 42° C. At higher temperatures, other phenomena presumably become predominant, because the capric acid does not then form an effective vapor-form corrosion inhibitor, while several of the above-mentioned acids were at least partially effective.
De følgende eksempler illustrerer for-skjellen mellom bruken av kaprinsyre og dens homologer under et korrosjonshindrende forsøk i dampfase som ble utført for å påvise den relative korrosjonshindrende evne under lagringsbetingelser mellom ca. —1° C og ca. 42° C, betingelser som hersker under lagringen av metallgjenstander i lagerhus eller lignende situasjoner. I dette forsøk blir en metallprøve montert i en fenolformaldehydharpiks-blokk og opphengt ved hjelp av et glassrør i en glassbeholder 4 cm over en plattform på hvilken et filterpapir impregnert med det korrosjonsbeskyttende middel skulle undersøkes. Under plattformen, som danner en skjerm, anbringes vann, og hele apparatet settes i en ovn ved 37° C i 16 timer. Derefter anbringes isvann i glass-røret, over og i kontakt med den mon-terte metallprøve. Dette tillater kondense-ring av vann på den utsatte prøveoverflate. Apparatet iakttas derefter med totimers mellomrom. Isvann fornyes annen hver time for å tilveiebringe en kold og cyklisk kondensasjonsoverflate på overflaten av metallet som holdes i ovnen ved 37° C. De nedenfor angitte tall viser at kaprinsyre virker ypperlig som korrosjonshindrende middel ved omgivelsestemperaturen i minst fire sykluser. De nedenfor angitte tall viser også at de nære homologer, nem-lig kaprylsyre og kaproinsyre ikke hadde noen verdi, mens laurinsyre bare hindret rustning i to sykluser. Nærvær av metyl-aminkaprat i kombinasjon med kaprinsyre tilveiebringer også en vesentlig fullstendig korrosjonsbeskyttelse i dampfase. The following examples illustrate the difference between the use of capric acid and its homologues during a vapor phase corrosion inhibition test which was carried out to demonstrate the relative corrosion inhibition ability under storage conditions between approx. -1° C and approx. 42° C, conditions that prevail during the storage of metal objects in warehouses or similar situations. In this experiment, a metal sample is mounted in a phenol-formaldehyde resin block and suspended by means of a glass tube in a glass container 4 cm above a platform on which a filter paper impregnated with the corrosion protection agent was to be examined. Water is placed under the platform, which forms a screen, and the entire apparatus is placed in an oven at 37° C. for 16 hours. Ice water is then placed in the glass tube, above and in contact with the mounted metal sample. This allows condensation of water on the exposed sample surface. The device is then observed at two-hour intervals. Ice water is renewed every two hours to provide a cold and cyclic condensation surface on the surface of the metal which is kept in the oven at 37° C. The figures given below show that capric acid works excellently as an anti-corrosion agent at ambient temperature for at least four cycles. The figures given below also show that the close homologues, namely caprylic acid and caproic acid had no value, while lauric acid only prevented armoring in two cycles. The presence of methylamine caprate in combination with capric acid also provides substantially complete corrosion protection in the vapor phase.
I ovennevnte forsøk ble 4 g syre opp-løst i 20 ems isopropylalkohol. y2 ems av In the above experiment, 4 g of acid were dissolved in 20 ems of isopropyl alcohol. y2 ems off
denne oppløsning ble avsatt på et filterpapir med en diameter på 4 cm. this solution was deposited on a filter paper with a diameter of 4 cm.
Det foretrekkes at den i henhold til It is preferred that the according to
oppfinnelsen brukte mengde av kaprinsyre er tilstrekkelig for et betydelig tids-rom som korrosjonshindrende middel for the amount of capric acid used in the invention is sufficient for a considerable period of time as a corrosion inhibitor
det metall som skal beskyttes og under de the metal to be protected and below them
betingelser for hvilke det er utsatt. Nor-malt vil denne mengde av kaprinsyre ut-gjøre mellom ca. 0,55 g og 55 g pr. m2 av conditions to which it is exposed. Normally, this amount of capric acid will amount to between approx. 0.55 g and 55 g per m2 of
innpakningsmaterialet. the wrapping material.
Claims (1)
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CH1306572A CH556589A (en) | 1972-09-06 | 1972-09-06 | CONTAINER FOR ACCEPTING A CASSETTE WITH A TAPE-SHAPED RECORDING MEDIA. |
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NO136228C NO136228C (en) | 1977-08-03 |
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NO3462/73A NO136228C (en) | 1972-09-06 | 1973-09-04 | CONTAINER FOR A CASSETTE WITH A BAND-SHAPED REGISTRATION BAR. |
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DD (1) | DD105919A5 (en) |
DE (3) | DE2248408C2 (en) |
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FI (1) | FI56593C (en) |
FR (1) | FR2198210B1 (en) |
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- 1973-08-24 AT AT736773A patent/AT336300B/en not_active IP Right Cessation
- 1973-08-27 US US391962A patent/US3899229A/en not_active Expired - Lifetime
- 1973-08-27 ZA ZA00735860A patent/ZA735860B/en unknown
- 1973-08-29 DE DE2343487A patent/DE2343487C2/en not_active Expired
- 1973-08-29 DE DE2366590A patent/DE2366590C2/en not_active Expired
- 1973-09-02 IL IL43132A patent/IL43132A/en unknown
- 1973-09-03 CS CS6141A patent/CS168668B2/cs unknown
- 1973-09-04 DD DD173268A patent/DD105919A5/xx unknown
- 1973-09-04 NO NO3462/73A patent/NO136228C/en unknown
- 1973-09-04 JP JP48098970A patent/JPS5211578B2/ja not_active Expired
- 1973-09-05 CA CA180,359A patent/CA1001588A/en not_active Expired
- 1973-09-05 SE SE7312106A patent/SE389572B/en unknown
- 1973-09-05 AU AU60033/73A patent/AU477187B2/en not_active Expired
- 1973-09-05 SU SU1958187A patent/SU505390A3/en active
- 1973-09-05 BE BE135327A patent/BE804473A/en not_active IP Right Cessation
- 1973-09-05 GB GB4177973A patent/GB1408516A/en not_active Expired
- 1973-09-05 YU YU2360/73A patent/YU35687B/en unknown
- 1973-09-05 DK DK489373AA patent/DK136922B/en not_active IP Right Cessation
- 1973-09-05 ES ES418645A patent/ES418645A1/en not_active Expired
- 1973-09-05 FR FR7332057A patent/FR2198210B1/fr not_active Expired
- 1973-09-06 FI FI2774/73A patent/FI56593C/en active
- 1973-09-06 BR BR6942/73A patent/BR7306942D0/en unknown
- 1973-09-06 AR AR249960A patent/AR201010A1/en active
- 1973-09-06 IT IT69661/73A patent/IT996658B/en active
- 1973-09-06 NL NLAANVRAGE7312316,A patent/NL171304C/en not_active IP Right Cessation
-
1976
- 1976-06-03 HK HK328/76*UA patent/HK32876A/en unknown
-
1978
- 1978-11-22 KR KR7805909U patent/KR790000094Y1/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1986001930A1 (en) * | 1984-09-21 | 1986-03-27 | Frodelius Jan Erik | Storage means for tape or disc recording media |
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