{"id":3050,"date":"2022-02-07T06:55:13","date_gmt":"2022-02-07T06:55:13","guid":{"rendered":"https:\/\/3.212.105.250\/?p=3050"},"modified":"2025-01-19T14:20:54","modified_gmt":"2025-01-19T20:20:54","slug":"rakokorroosion-tunnistaminen-ja-ehkaiseminen","status":"publish","type":"post","link":"https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2022\/02\/07\/rakokorroosion-tunnistaminen-ja-ehkaiseminen\/","title":{"rendered":"Rakokorroosion tunnistaminen ja ehk\u00e4iseminen"},"content":{"rendered":"<p>Useimmat korroosion muodot on helppo havaita. Olipa kyseess\u00e4 halkeilu, v\u00e4rimuutos tai ruoste, jokin asia paljastaa sen. On kuitenkin joitakin korroosion muotoja, jotka ovat tunnetusti salakavalia. N\u00e4m\u00e4 korroosion muodot aiheuttavat tuhoa komponenteissa samalla, kun ne j\u00e4\u00e4v\u00e4t huomaamatta. Usein komponentit vioittuvat ilman mink\u00e4\u00e4nlaista varoitusta, jolloin olet j\u00e4rkyttynyt ja ihmettelet: \"Mit\u00e4 t\u00e4ss\u00e4 tapahtui?\".<\/p>\n<p>Yksi t\u00e4llainen korroosion muoto on rakokorroosio, joka muodostuu pieniss\u00e4, syrj\u00e4isiss\u00e4 paikoissa ja levi\u00e4\u00e4 alueille, jotka eiv\u00e4t ole helposti n\u00e4kyviss\u00e4. Vaikka rakokorroosiota on vaikea havaita, sen voi kuitenkin havaita alkuvaiheessa, jos on tarkkaavainen ja sinnik\u00e4s. T\u00e4ss\u00e4 oppaassa rakokorroosion tunnistamiseen ja ehk\u00e4isemiseen k\u00e4ymme l\u00e4pi rakokorroosion perusteet ja opastamme, miten voit tehokkaasti havaita ja ehk\u00e4ist\u00e4 sit\u00e4. Aloitetaan.<\/p>\n<h2>Mik\u00e4 on rakokorroosio?<\/h2>\n<p>Rakokorroosio, joka tunnetaan my\u00f6s nimell\u00e4 talletus- tai tiivistyskorroosio, on <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2021\/06\/15\/mita-voit-tehda-paikalliselle-korroosiolle\/'>korroosion paikallinen muoto<\/a> joka hy\u00f6kk\u00e4\u00e4 liitettyjen pintojen v\u00e4liseen rakoon. Se voi vaikuttaa sek\u00e4 metallin ja metallin v\u00e4lisiin ett\u00e4 metallin ja ei-metallin v\u00e4lisiin rakoihin. Jos rakokorroosiota ei valvota, se voi aiheuttaa materiaalin halkeilua ja lopulta komponentin tai rakenteen rikkoutumisen.<\/p>\n<h2>Mik\u00e4 aiheuttaa rakokorroosiota?<\/h2>\n<p>Seuraava askel rakokorroosion tunnistamisessa ja est\u00e4misess\u00e4 on sen syiden ymm\u00e4rt\u00e4minen. Rakokorroosio johtuu erilaisista kemiallisista koostumuksista tietyiss\u00e4 kohdissa l\u00e4hell\u00e4 liitettyj\u00e4 pintoja. T\u00e4m\u00e4 kemiallisen koostumuksen ero syntyy, kun ilma, vesi tai jokin muu sy\u00f6vytt\u00e4v\u00e4 aine tunkeutuu materiaalien v\u00e4liseen pieneen rakoon ja j\u00e4\u00e4 sinne.<\/p>\n<p>T\u00e4m\u00e4 pys\u00e4htyneisyys aiheuttaa kemiallisen reaktion, joka v\u00e4hent\u00e4\u00e4 alueen hapen m\u00e4\u00e4r\u00e4\u00e4 ja tulvii rakoon positiivisia metalli-ioneja, jolloin rako muuttuu anodiksi. T\u00e4m\u00e4n j\u00e4lkeen negatiiviset ionit tasapainottavat positiivisten ionien tulvan ja luovat hapon, joka hy\u00f6kk\u00e4\u00e4 ja sy\u00f6 jommankumman tai molempien materiaalien suojaavan oksidikalvon.<\/p>\n<h2>Ovatko rakokorroosio ja pistekorroosio sama asia?<\/h2>\n<p>Monet ihmiset olettavat, ett\u00e4 rakokorroosio ja pistekorroosio ovat samoja asioita, koska ne toimivat ja esiintyv\u00e4t samalla tavalla. Molemmat korroosion muodot johtuvat materiaalin suojaavan oksidikalvon hajoamisesta. Lis\u00e4ksi molemmat voivat aiheuttaa kuoppien muodostumista. Pistekorroosio vaikuttaa kuitenkin metallin koko pintaan, kun taas rakokorroosio vaikuttaa yksinomaan rakojen sis\u00e4ll\u00e4 ja ymp\u00e4rill\u00e4 olevaan alueeseen. Pistekorroosio on usein vakavampaa, mutta rakokorroosiota on vaikeampi havaita, ja se aiheuttaa paljon todenn\u00e4k\u00f6isemmin komponentin tai rakenteen rikkoutumisen.<\/p>\n<h2>Miten tunnistaa rakokorroosio<\/h2>\n<p>Halkeamakorroosiota esiintyy todenn\u00e4k\u00f6isimmin kahden materiaalin liitoskohdissa - esimerkiksi aluslevyjen, tiivisteiden ja puristimien alla tai palkkien ja levyjen liitoskohdissa. Yleisi\u00e4 rakokorroosion merkkej\u00e4 ovat muun muassa:<\/p>\n<ul>\n<li>Maalin v\u00e4rj\u00e4ytyminen liitettyjen alueiden l\u00e4hell\u00e4<\/li>\n<li>Suojapinnoite hilseilee raoissa tai niiden l\u00e4heisyydess\u00e4.<\/li>\n<li>Varsinaisen materiaalin hilseily\u00e4 liitettyjen alueiden l\u00e4hell\u00e4<\/li>\n<\/ul>\n<p>Rakokorroosion merkit ovat hienovaraisia ja j\u00e4\u00e4v\u00e4t usein huomaamatta. Niit\u00e4 voi olla my\u00f6s vaikea havaita, koska monet raot ovat eritt\u00e4in pieni\u00e4 (vain muutaman mikrometrin levyisi\u00e4) tai ne ovat suojakilpien peitossa. Jos et aktiivisesti etsi merkkej\u00e4 rakokorroosiosta, saatat huomata sen vasta, kun on liian my\u00f6h\u00e4ist\u00e4!<\/p>\n<p>Jos havaitset yhden tai useamman edell\u00e4 mainituista erityispiirteist\u00e4, \u00e4l\u00e4 hylk\u00e4\u00e4 niit\u00e4. Ne voivat olla varhainen varoitusmerkki rakokorroosiosta. Rakokorroosion varhainen tunnistaminen ja hoito on avain vakavien vaurioiden ja vikojen ehk\u00e4isemiseen.<\/p>\n<h2>Mitk\u00e4 materiaalit ovat suurimmassa vaarassa?<\/h2>\n<p>Jotkin materiaalit ovat alttiimpia t\u00e4lle korroosiolle kuin toiset. Rakokorroosioon vaikuttavia tekij\u00f6it\u00e4 ovat muun muassa seuraavat:<\/p>\n<h3>Rakotyyppi<\/h3>\n<p>Onko rako metalli-metalli-rako vai metalli-metalli-ei-metalli-rako?<\/p>\n<h3>Geometria<\/h3>\n<p>Mink\u00e4 kokoinen ja syvyinen rako on? Kuinka karkea pinta on?<\/p>\n<h3>Materiaali<\/h3>\n<p>Mik\u00e4 on rakoilun seoskoostumusrakenne?<\/p>\n<h3>Ymp\u00e4rist\u00f6<\/h3>\n<p>Mik\u00e4 on ymp\u00e4r\u00f6iv\u00e4n ilman ja maaper\u00e4n pH? Mik\u00e4 on ilman happipitoisuus? Ent\u00e4 alueen s\u00e4\u00e4 ja l\u00e4mp\u00f6tila? Kuinka paljon halidi- ja kloridi-ioneja on ymp\u00e4rist\u00f6ss\u00e4?<\/p>\n<p>Yleisesti ottaen rakokorroosiolle alttiimmat materiaalit ovat kalvoa muodostavia seoksia, joiden korroosionkest\u00e4vyys perustuu passiivisten kalvojen (eli suojaavan oksidikalvon) vakauteen. N\u00e4ihin kuuluvat alumiiniseokset ja kaikkien laatuluokkien ruostumaton ter\u00e4s.<\/p>\n<h2>Rakokorroosion est\u00e4minen<\/h2>\n<p>Onneksi voit est\u00e4\u00e4 rakokorroosion, kuten useimmat korroosion muodot. T\u00e4rkeimm\u00e4t menetelm\u00e4t rakokorroosion est\u00e4miseksi ovat seuraavat:<\/p>\n<ul>\n<li>Pienten rakojen poistaminen, jotka voivat sitoa korroosioaineita (voit tiivist\u00e4\u00e4 rakoja jatkuvalla hitsauksella tai juottamalla).<\/li>\n<li>k\u00e4ytt\u00e4m\u00e4ll\u00e4 korkealuokkaisia seoksia, jotka kest\u00e4v\u00e4t rakokorroosiota (pistesy\u00f6pymist\u00e4 kest\u00e4v\u00e4t materiaalit kest\u00e4v\u00e4t usein my\u00f6s rakokorroosiota).<\/li>\n<li>alttiiden alueiden kuivattaminen ja kuivaaminen sateen tai lumen j\u00e4lkeen umpeenkasvun est\u00e4miseksi.<\/li>\n<li>Pultti- tai kierteitettyjen liitosten sijasta k\u00e4ytet\u00e4\u00e4n tyss\u00e4hitsausliitoksia.<\/li>\n<li>Teflonista valmistettujen ei-imeytyvien tiivisteiden k\u00e4ytt\u00f6<\/li>\n<\/ul>\n<h2>Voiko rakokorroosion kumota?<\/h2>\n<p>Valitettavasti jo tapahtuneita korroosiovaurioita ei voi mitenk\u00e4\u00e4n peruuttaa. Voit kuitenkin ryhty\u00e4 edell\u00e4 mainittuihin toimenpiteisiin, jotta korroosio ei p\u00e4\u00e4se levi\u00e4m\u00e4\u00e4n pidemm\u00e4lle ja vahingoittamaan lis\u00e4\u00e4 materiaalia. Voit usein pelastaa osat, joissa on vain v\u00e4h\u00e4n korroosiota, mutta voimakkaasti sy\u00f6pyneet tai vioittuneet osat on vaihdettava. Onneksi ennaltaehk\u00e4isevien toimenpiteiden toteuttaminen est\u00e4\u00e4 korvaavia materiaaleja joutumasta samaan kohtaloon kuin niit\u00e4 edelt\u00e4neet materiaalit.<\/p>\n<p>Yksi yleinen tapa ehk\u00e4ist\u00e4 metallin korroosiota on se, ett\u00e4 <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/konsultointialueet\/korroosio\/katodisuojapotentiaalin-tutkimukset\/'>katodinen suojaus,<\/a> tekniikka, jolla estet\u00e4\u00e4n korroosiota muuttamalla metalli s\u00e4hk\u00f6kemiallisen kennon katodiksi. Jos olet kiinnostunut kokeilemaan <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2023\/03\/10\/katodisuojausinsinoorit\/'>katodinen suojaus<\/a> korroosionestomenetelm\u00e4n\u00e4, Dreiym Engineering voi auttaa. Tarjoamme katodista suojausta <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/konsultointialueet\/rikostekninen-konsultointi\/tulipalo-rajahdys\/asuinrakennusten-energiavarastointijarjestelma-palontutkintapalvelu\/'>j\u00e4rjestelm\u00e4n suunnittelu- ja asennuspalvelut<\/a>. Niille, joilla on jo k\u00e4yt\u00f6ss\u00e4 katodisuojausj\u00e4rjestelm\u00e4, tarjoamme my\u00f6s seuraavia palveluja.\u00a0<a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/services\/korroosio\/hairioiden-testaus\/\"><strong>katodisuojauksen testaus<\/strong><\/a>\u00a0palvelut, joilla varmistetaan, ett\u00e4 j\u00e4rjestelm\u00e4 toimii edelleen tarkoitetulla tavalla.<\/p>\n<p>Kaikilla lisensoiduilla ammatti-insin\u00f6\u00f6reill\u00e4mme on CP3- tai CP4-sertifiointi ja vuosien kokemus testauksesta. <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2020\/10\/22\/katodiseen-suojaukseen-vaikuttavat-tekijat\/'>katodinen suojaus<\/a> j\u00e4rjestelm\u00e4t. Voit luottaa siihen, ett\u00e4 tiimimme suorittaa nopeasti j\u00e4rjestelm\u00e4\u00e4si koskevat arvioinnit ja antaa sinulle tarvittavat tiedot, jotta voit pit\u00e4\u00e4 <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2024\/06\/11\/katodisuojauksen-uudelleentarkastelu-nykyiset-suuntaukset-ja-parhaat-kaytannot\/'>katodinen suojaus<\/a> j\u00e4rjestelm\u00e4 erinomaisessa kunnossa.<\/p>\n<p>Ota meihin yhteytt\u00e4 jo t\u00e4n\u00e4\u00e4n, jos sinulla on kysytt\u00e4v\u00e4\u00e4 tai jos haluat lis\u00e4tietoja <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fi\/2023\/05\/17\/4-katodisuojauksen-testausmenetelmat\/'>katodisuojauksen asennus ja testaus<\/a> palvelut.<\/p>\n<img decoding=\"async\" class=\"aligncenter wp-image-3940 size-full\" src=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Preventing-Crevice-Corrosion.jpg\" alt=\"Rakokorroosion tunnistaminen ja ehk\u00e4iseminen\" width=\"800\" height=\"2000\" srcset=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Preventing-Crevice-Corrosion.jpg 800w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Preventing-Crevice-Corrosion-120x300.jpg 120w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Preventing-Crevice-Corrosion-768x1920.jpg 768w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Preventing-Crevice-Corrosion-614x1536.jpg 614w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>","protected":false},"excerpt":{"rendered":"<p>Most forms of corrosion are easy to detect. Whether it\u2019s the cracking, the discoloration, or the rust, there\u2019s something that gives it away. But there are some forms of corrosion that are notoriously sneaky. These forms of corrosion wreak havoc on components while sneaking under the radar. Often, components will fail with little to no [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":3454,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_mbp_gutenberg_autopost":false,"_pgmb_is_evergreen":true,"_pgmb_ap_template_id":0,"iawp_total_views":341,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-3050","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-corrosion-and-cathodic-protection"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.6.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"Most forms of corrosion are easy to detect. 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