{"id":3053,"date":"2022-02-28T06:55:52","date_gmt":"2022-02-28T06:55:52","guid":{"rendered":"https:\/\/3.212.105.250\/?p=3053"},"modified":"2025-01-17T18:04:35","modified_gmt":"2025-01-18T00:04:35","slug":"hur-man-identifierar-och-avlagsnar-punktfratning","status":"publish","type":"post","link":"https:\/\/vm6fr4whzn6.c.updraftclone.com\/sv\/2022\/02\/28\/hur-man-identifierar-och-avlagsnar-punktfratning\/","title":{"rendered":"Hur man identifierar och avl\u00e4gsnar punktfr\u00e4tning"},"content":{"rendered":"<p>Korrosion \u00e4r en fiende f\u00f6r alla typer av metaller. Denna skadliga process f\u00e5r metallmaterial att gradvis rosta och brytas ned; och ofta angriper den i smyg, utan att uppt\u00e4ckas f\u00f6rr\u00e4n skadan redan \u00e4r skedd.<\/p>\n<p>Det som g\u00f6r korrosion \u00e4nnu sv\u00e5rare att uppt\u00e4cka och f\u00f6rebygga \u00e4r att den f\u00f6rekommer i m\u00e5nga olika former. En av dessa \u00e4r punktfr\u00e4tning, som anses vara en av de l\u00f6mskaste och mest skadliga formerna av korrosion. Fr\u00e4tkorrosion kan f\u00f6rvanska metallytor och \u00e4ventyra deras stabilitet.<\/p>\n<p>I den h\u00e4r guiden ger vi en kort \u00f6versikt \u00f6ver punktfr\u00e4tning, vad den g\u00f6r och vad som orsakar den. Vi g\u00e5r ocks\u00e5 igenom hur man identifierar och avl\u00e4gsnar punktfr\u00e4tning. L\u00e4s vidare f\u00f6r att l\u00e4ra dig mer om denna unika form av korrosion och hur du f\u00f6rhindrar att den f\u00f6rst\u00f6r dina metallr\u00f6r och andra komponenter.<\/p>\n<h2>Vad \u00e4r punktfr\u00e4tning?<\/h2>\n<p>Gropfr\u00e4tning, eller bara gropfr\u00e4tning som det ocks\u00e5 kallas, \u00e4r en typ av <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/sv\/2021\/06\/15\/vad-du-kan-gora-at-lokal-korrosion\/'>Lokaliserad korrosion<\/a> som drabbar aluminium, j\u00e4rn, st\u00e5l och andra metallmaterial. Den k\u00e4nnetecknas av de rostt\u00e4ckta h\u00e5ligheter, eller gropar, som den l\u00e4mnar p\u00e5 materialets yta. Om den inte kontrolleras kan gropfr\u00e4tning permanent skada materialet och g\u00f6ra metallen tunnare, vilket leder till en f\u00f6r\u00f6dande f\u00f6rlust av strukturell integritet.<\/p>\n<h2>Vad orsakar punktfr\u00e4tning?<\/h2>\n<p>Fr\u00e4tkorrosion uppst\u00e5r oftast p\u00e5 grund av depassivering av ett litet omr\u00e5de. Detta lilla omr\u00e5de blir anodiskt, medan det omgivande omr\u00e5det blir katodiskt. Detta leder till lokal korrosion.<\/p>\n<p>Men vad \u00e4r det som orsakar depassivering i f\u00f6rsta hand? Sm\u00e5 defekter, som sprickor, flisor och repor! Sm\u00e5 repor p\u00e5 metallytan kanske inte verkar s\u00e5 farliga, men de kan skada metallens skyddande bel\u00e4ggning och g\u00f6ra att den inte l\u00e4ngre \u00e4r passiv. De vanligaste orsakerna till punktfr\u00e4tning \u00e4r bl.a:<\/p>\n<ul>\n<li>Sprickor<\/li>\n<li>Repor<\/li>\n<li>Chips<\/li>\n<li>Oj\u00e4mn sp\u00e4nning<\/li>\n<li>Defekt metallsubstrat<\/li>\n<li>Exponering f\u00f6r turbulent v\u00e4tska<\/li>\n<li>Oj\u00e4mn skyddsbel\u00e4ggning<\/li>\n<li>Kemiska attacker<\/li>\n<\/ul>\n<p>S\u00e5 om din metall \u00e4r skadad p\u00e5 n\u00e5got s\u00e4tt eller uts\u00e4tts f\u00f6r oroligt vatten b\u00f6r du h\u00e5lla ett extra \u00f6ga p\u00e5 pitting. En annan potentiell orsak till gropfr\u00e4tning \u00e4r olika luftning. N\u00e4r en d\u00e5ligt underh\u00e5llen metall uts\u00e4tts f\u00f6r vatten eller dammpartiklar blir ett litet omr\u00e5de syrefattigt. Detta orsakar en skillnad i luftning mellan det och det omgivande omr\u00e5det. En reaktion uppst\u00e5r och rostgropar bildas p\u00e5 metallytan.<\/p>\n<h2>Hur man k\u00e4nner igen punktfr\u00e4tning<\/h2>\n<p>M\u00e5nga anser att gropkorrosion \u00e4r en av de farligaste formerna av korrosion eftersom den \u00e4r s\u00e5 sv\u00e5r att f\u00f6rutse, uppt\u00e4cka och f\u00f6rhindra. Du kanske t\u00e4nker: \"V\u00e4nta, eftersom den skapar gropar p\u00e5 metallytan, borde den inte vara l\u00e4tt att uppt\u00e4cka?\" Tyv\u00e4rr \u00e4r de gropar som skapas otroligt sm\u00e5. De flesta \u00e4r osynliga (eller n\u00e4stan osynliga) f\u00f6r det m\u00e4nskliga \u00f6gat. De \u00e4r dessutom ofta t\u00e4ckta av ett korrosionsskikt, vilket g\u00f6r dem \u00e4nnu sv\u00e5rare att uppt\u00e4cka.<\/p>\n<p>Att uppt\u00e4cka korrosion med blotta \u00f6gat \u00e4r n\u00e4stan om\u00f6jligt, men det finns\u00a0<em>\u00e4r<\/em>\u00a0tillf\u00f6rlitliga s\u00e4tt att testa f\u00f6r det. Testning kan f\u00f6rhindra att gropfr\u00e4tning f\u00e5r f\u00f6r\u00f6dande konsekvenser, s\u00e5 vi rekommenderar att k\u00e4nsliga material testas ofta. Vanliga testmetoder f\u00f6r gropkorrosion inkluderar:<\/p>\n<h3>Visuell unders\u00f6kning<\/h3>\n<p>Med hj\u00e4lp av ett mikroskop r\u00e4knar experten antalet gropar i ett visst omr\u00e5de. Detta hj\u00e4lper dem att avg\u00f6ra deras storlek och f\u00f6rdelning samt intensitet.<\/p>\n<h3>Testning av ljud<\/h3>\n<p>Vid sonisk provning \u00f6verf\u00f6rs ultraljudsenergi genom en koppling till metallen. Ultraljudspulserna studsar mot metallen och omvandlas till elektriska signaler. Dessa signaler visar var det finns gropar och andra oj\u00e4mnheter i metallen.<\/p>\n<h3>Elektromagnetisk provning<\/h3>\n<p>Denna provningsmetod anv\u00e4nds f\u00f6r att lokalisera oj\u00e4mnheter i ytan p\u00e5 ledande metaller som st\u00e5l och j\u00e4rn.<\/p>\n<h3>Elektrokemisk provning<\/h3>\n<p>Elektrokemiska tester \u00e4r ett annat s\u00e4tt att testa korrosionshastigheten i metaller. Under testet appliceras en elektrisk str\u00f6m p\u00e5 metallens arbetselektrod f\u00f6r att skapa m\u00e4tbara signaler.<\/p>\n<h3>Test av neds\u00e4nkning<\/h3>\n<p>En bit av metallen s\u00e4nks ned i en l\u00f6sning. Den f\u00e5r ligga i n\u00e5gra dagar. Efter avl\u00e4gsnandet m\u00e4ts korrosionshastigheten och groparna unders\u00f6ks i mikroskop f\u00f6r att ytterligare fastst\u00e4lla omfattning och intensitet.<\/p>\n<h2>Vilka material \u00e4r mest utsatta?<\/h2>\n<p>Material som inneh\u00e5ller bromid-, klorid- eller hypokloritjoner \u00e4r mest k\u00e4nsliga f\u00f6r punktfr\u00e4tning. Material som uts\u00e4tts f\u00f6r l\u00f6sningar som inneh\u00e5ller fluorider eller joditer (som vatten eller sulfider) l\u00f6per ocks\u00e5 en \u00f6kad risk. N\u00e5gra metaller som \u00e4r utsatta f\u00f6r punktfr\u00e4tning \u00e4r:<\/p>\n<ul>\n<li>Krom<\/li>\n<li>Rostfritt st\u00e5l<\/li>\n<li>Kvicksilver<\/li>\n<li>Kobolt<\/li>\n<li>Aluminium<\/li>\n<li>Koppar<\/li>\n<\/ul>\n<h2>F\u00f6rhindra spaltkorrosion<\/h2>\n<p>F\u00f6rutom att veta hur man identifierar och tar bort korrosionsangrepp vill man f\u00f6rmodligen ocks\u00e5 veta hur man f\u00f6rhindrar att korrosionsangrepp uppst\u00e5r. Det finns n\u00e5gra s\u00e4tt att minimera risken f\u00f6r punktfr\u00e4tning.<\/p>\n<p>Att anv\u00e4nda korrosionsbest\u00e4ndiga material \u00e4r en av de f\u00f6rsta f\u00f6rebyggande \u00e5tg\u00e4rderna som b\u00f6r vidtas. Legeringar som inneh\u00e5ller titan, kv\u00e4ve, krom och molybden \u00e4r mycket motst\u00e5ndskraftiga mot gropfr\u00e4tning. En annan effektiv f\u00f6rebyggande metod \u00e4r <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/sv\/konsultomraden\/korrosion\/potentialundersokningar-for-katodiskt-skydd\/storningar-i-katodiskt-skydd\/'>katodiskt skydd,<\/a> som f\u00f6rhindrar korrosion genom att f\u00f6rvandla en metallyta till en elektrokemisk cell. Helst b\u00f6r du bel\u00e4gga materialet med en mer reaktiv metall. Den korrosiva metallen kommer att fungera som en anod och korrodera i st\u00e4llet f\u00f6r den ursprungliga metallen, vilket f\u00f6rhindrar gropfr\u00e4tning.<\/p>\n<p>Ett annat av de mest effektiva s\u00e4tten att f\u00f6rhindra punktfr\u00e4tning \u00e4r att kontrollera milj\u00f6faktorer (fuktighet, temperatur, klorid, pH-syror och saltniv\u00e5er) efter b\u00e4sta f\u00f6rm\u00e5ga. Andra metoder f\u00f6r att f\u00f6rhindra gropfr\u00e4tning \u00e4r att anv\u00e4nda och underh\u00e5lla en skyddande bel\u00e4ggning och att kontrollera exponeringen f\u00f6r v\u00e4tskor och damm.<\/p>\n<h2>Kan man ta bort gropkorrosion?<\/h2>\n<p>Till skillnad fr\u00e5n de flesta former av korrosion kan gropfr\u00e4tning avl\u00e4gsnas. F\u00f6rutsatt att metallen fortfarande \u00e4r strukturellt sund kan du ta bort korrosionen med en mild syra. Om du vill ta bort sj\u00e4lva gropen m\u00e5ste du slipa, skrapa eller sandbl\u00e4stra metallen. Du kan ocks\u00e5 ta bort gropar mekaniskt.<\/p>\n<p>N\u00e4r korrosionen och groparna \u00e4r borta b\u00f6r du grundm\u00e5la metallen med n\u00e5gon av f\u00f6ljande bel\u00e4ggningsmetoder:<\/p>\n<ul>\n<li>Zinkfosfat grundning<\/li>\n<li>Metallisering med zinkspray<\/li>\n<li>Kemisk bel\u00e4ggning<\/li>\n<li>Varm doppning<\/li>\n<\/ul>\n<p>Letar du efter s\u00e4tt att h\u00e5lla punktfr\u00e4tning borta? Experterna p\u00e5 Dreiym Engineering kan hj\u00e4lpa dig! Vi erbjuder\u00a0<a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/sv\/services\/korrosion\/analys-av-markens-korrosivitet\/\"><strong>testning av markens korrosivitet<\/strong><\/a>\u00a0f\u00f6r att m\u00e4ta korrosiviteten i den jord som dina metallkomponenter \u00e4r nedgr\u00e4vda i. Vi kan ocks\u00e5 <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/sv\/konsultomraden\/korrosion\/utformning-av-katodiskt-skydd\/'>utformning och installation av katodiskt skydd<\/a> system f\u00f6r att ytterligare minska risken f\u00f6r gropfr\u00e4tning. Kontakta oss idag f\u00f6r att f\u00e5 veta mer om v\u00e5ra korrosionsf\u00f6rebyggande tj\u00e4nster eller f\u00f6r att boka en konsultation.<\/p>\n<img decoding=\"async\" class=\"aligncenter wp-image-3938 size-full\" src=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Remove-Pitting-Corrosion.jpg\" alt=\"Hur man identifierar och avl\u00e4gsnar punktfr\u00e4tning\" width=\"800\" height=\"2000\" srcset=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Remove-Pitting-Corrosion.jpg 800w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Remove-Pitting-Corrosion-120x300.jpg 120w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Remove-Pitting-Corrosion-768x1920.jpg 768w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Remove-Pitting-Corrosion-614x1536.jpg 614w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>","protected":false},"excerpt":{"rendered":"<p>Corrosion is the enemy of metals of all kinds. This damaging process causes metal materials to gradually rust and degrade; and often, it attacks sneakily, undetectable until the damage is already done. What makes corrosion even harder to detect and prevent is that it comes in many forms. One of these is pitting corrosion, regarded [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":3453,"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":602,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-3053","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=\"Corrosion is the enemy of metals of all kinds. 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This damaging process causes metal materials to gradually rust and degrade; and often, it attacks sneakily, unde\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/sv\/2022\/02\/28\/hur-man-identifierar-och-avlagsnar-punktfratning\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/How-To-Identify-and-Remove-Pitting-Corrosion.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/How-To-Identify-and-Remove-Pitting-Corrosion.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"708\" \/>\n\t\t<meta property=\"og:image:height\" content=\"425\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2022-02-28T06:55:52+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2025-01-18T00:04:35+00:00\" \/>\n\t\t<script type=\"application\/ld+json\" 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