FI71626B - BLYMANTELKABEL BESTAENDIG MOT JORDKORROSION - Google Patents
BLYMANTELKABEL BESTAENDIG MOT JORDKORROSION Download PDFInfo
- Publication number
- FI71626B FI71626B FI850456A FI850456A FI71626B FI 71626 B FI71626 B FI 71626B FI 850456 A FI850456 A FI 850456A FI 850456 A FI850456 A FI 850456A FI 71626 B FI71626 B FI 71626B
- Authority
- FI
- Finland
- Prior art keywords
- lead
- corrosion
- jordkorrosion
- blymantelkabel
- bestaendig
- Prior art date
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- Ropes Or Cables (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
71626 MAAPERÄKORROOSIOTA KESTÄVÄ LYIJYVAIPPAKAAPELI.71626 LEAD CORROSION RESISTANT LEAD SHIELD CABLE.
Viestintä- ja voimakaapeleina käytettävissä 1yijyväippakaapel ei ssa on kaapelin käyttötarkoituksesta ja paksuudesta riippuen erilaisia vahvistus- tai eristyskerroksia lyijyvaipan ympärillä. Näiden kerrosten tarkoituksena on parantaa kaapelivaipan sähköisiä, mekaanisia ja 5 korroosionkesto-ominaisuuksia.Depending on the purpose and thickness of the cable, the lead wire cable used as communication and power cables does not have different reinforcement or insulation layers around the lead sheath. The purpose of these layers is to improve the electrical, mechanical and 5 corrosion resistance properties of the cable sheath.
Sähköisten ja korroosionkesto-ominaisuuksien parantamiseksi käytetyt tavallisimmat materiaalit ovat bitumi, bitumiky11ästetty kreppipaperi ja erilaiset muovit. Korroosionestomielessä näillä pyritään estämään tai hidastamaan veden ja siinä liuenneena olevien aggressiivisten 10 aineiden pääsyä lyijyvaipan pintaan. Eristyskerrosten kostuessa tai mekaanisesti vaurioituessa näin kuitenkin tapahtuu, lyijyvaippa syöpyy puhki ja kaapeli on käyttökelvoton.The most common materials used to improve electrical and corrosion resistance properties are bitumen, bitumen-impregnated crepe paper, and various plastics. In the sense of anti-corrosion, these aim to prevent or slow down the entry of water and aggressive substances dissolved therein into the surface of the lead sheath. However, when the insulation layers get wet or mechanically damaged, this happens, the lead sheath corrodes the puncture and the cable is unusable.
Lyijyvaippakaapelien korroosion yleisin syy on happikonsentraatio-eroista johtuvien paika 11iskorroosioparien syntyminen lyijyvaipan 15 pinnalle.The most common cause of corrosion of lead sheath cables is the formation of localized corrosion pairs on the surface of the lead sheath 15 due to differences in oxygen concentration.
Kun aikaisemmin käytetyt, lähinnä mekaanisena diffuusioesteenä toimivat suojakerrokset eivät käytännössä ole osoittautuneet riittäviksi, saavutetaan tässä esiteltävällä keksinnöllä sellainen lyijyvaippakaapel in ulkoinen eristekerros, joka estää lyijyvaipan koorroosion.When the previously used protective layers, which mainly act as a mechanical diffusion barrier, have not proved to be sufficient in practice, the present invention provides an external insulating layer in a lead sheath cable which prevents corrosion of the lead sheath.
20 Keksintö perustuu lyijyn korroosiota estävän eräänlaisen kemiallisen "mikroympäristön" luomiseen ja säilyttämiseen lyijyvaipan pinnalla. Lyijy on havaittu olevan erittäin altis korroosiolle kosteuden läsnäollessa, jos sitä ympäröivän kosteuden eli veden happamuus on liian suuri ja jos lyijypinnoi1 la esiintyy paikallisia happipitoisuuden 25 eroja.The invention is based on the creation and maintenance of a kind of chemical "microenvironment" on the surface of a lead sheath which prevents the corrosion of lead. Lead has been found to be highly susceptible to corrosion in the presence of moisture if the acidity of the surrounding moisture, i.e. water, is too high and if local differences in oxygen content occur in the lead surface.
Tutkittaessa sellaisia korroosioinhibiittoreita, joiden voitaisiin olettaa pystyvän suojaamaan lyijyä kaapeleissa esiintyvältä korroosiolta, nimittäin natriumsilikaattia, natriumbentsoaattia ja natrium-molybdaattia, havaittiin natriummolybdaatti näistä ylivoimaisesti 30 tehokkaimmaksi. Tulos oli sama sekä visuaalisissa, sähkökemiallisissa että painohäviömittauksissa. Samanaikaisissa kokeissa todettiin edelleen, että korroosionesto oli tehokasta pH-arvon ollessa alueella 7-9, kuitenkin niin, että tehokkuushuippu oli pH-alueella 7.5-8.5.In the study of corrosion inhibitors that could be expected to be able to protect lead from corrosion in cables, namely sodium silicate, sodium benzoate and sodium molybdate, sodium molybdate was found to be by far the most effective of these. The result was the same in visual, electrochemical and weight loss measurements. In parallel experiments, it was further found that corrosion inhibition was effective at a pH in the range of 7-9, however, with an efficiency peak in the pH range of 7.5-8.5.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI850456A FI71626C (en) | 1985-02-05 | 1985-02-05 | Lead jacket cable resistant to soil corrosion. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI850456A FI71626C (en) | 1985-02-05 | 1985-02-05 | Lead jacket cable resistant to soil corrosion. |
| FI850456 | 1985-02-05 |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| FI850456A0 FI850456A0 (en) | 1985-02-05 |
| FI850456L FI850456L (en) | 1986-08-06 |
| FI71626B true FI71626B (en) | 1986-10-10 |
| FI71626C FI71626C (en) | 1987-01-19 |
Family
ID=8520314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI850456A FI71626C (en) | 1985-02-05 | 1985-02-05 | Lead jacket cable resistant to soil corrosion. |
Country Status (1)
| Country | Link |
|---|---|
| FI (1) | FI71626C (en) |
-
1985
- 1985-02-05 FI FI850456A patent/FI71626C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FI850456A0 (en) | 1985-02-05 |
| FI71626C (en) | 1987-01-19 |
| FI850456L (en) | 1986-08-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM | Patent lapsed |
Owner name: TIKKANEN, MATTI HAAKON AUGUST Owner name: YLAESAARI,_SEPPO TAPIO |