{"id":11861,"date":"2025-08-16T07:59:18","date_gmt":"2025-08-16T07:59:18","guid":{"rendered":"https:\/\/sinoextrud.com\/?p=11861"},"modified":"2025-08-16T07:59:18","modified_gmt":"2025-08-16T07:59:18","slug":"jak-zabranit-galvanicke-korozi-mezi-hlinikem-a-nerezovou-oceli","status":"publish","type":"post","link":"https:\/\/sinoextrud.com\/cs\/how-to-prevent-galvanic-corrosion-between-aluminum-and-stainless-steel\/","title":{"rendered":"Jak zabr\u00e1nit galvanick\u00e9 korozi hlin\u00edku a nerezov\u00e9 oceli?"},"content":{"rendered":"

\"Hlin\u00edkov\u00fd
Povrch s pr\u00e1\u0161kov\u00fdm n\u00e1st\u0159ikem zabra\u0148uje korozi kovu na kov.<\/figcaption><\/figure>\n<\/p>\n

P\u0159i dotyku hlin\u00edku a nerezov\u00e9 oceli m\u016f\u017ee doj\u00edt k tich\u00e9 korozi. Pokud se j\u00ed nev\u011bnuje pozornost, po\u0161kozuje d\u00edly, oslabuje spoje a zvy\u0161uje n\u00e1klady na \u00fadr\u017ebu.<\/p>\n

Galvanick\u00e9 korozi mezi hlin\u00edkem a nerezovou ocel\u00ed m\u016f\u017eete zabr\u00e1nit izolac\u00ed kov\u016f pomoc\u00ed nevodiv\u00fdch materi\u00e1l\u016f, n\u00e1t\u011br\u016f nebo vhodnou konstrukc\u00ed.<\/strong><\/p>\n

M\u00edch\u00e1n\u00ed kov\u016f bez pl\u00e1nov\u00e1n\u00ed vede k n\u00e1kladn\u00fdm oprav\u00e1m. P\u0159i spr\u00e1vn\u00e9m postupu v\u0161ak m\u016f\u017eete oba materi\u00e1ly bezpe\u010dn\u011b pou\u017e\u00edvat spole\u010dn\u011b. Pod\u00edvejme se, jak na to.<\/p>\n

Jak\u00e9 materi\u00e1ly mohou izolovat hlin\u00edk od nerezov\u00e9 oceli?<\/h2>\n

Mnoho in\u017een\u00fdr\u016f tento krok p\u0159ehl\u00ed\u017e\u00ed. Spr\u00e1vn\u00e1 izolace je v\u0161ak nej\u00fa\u010dinn\u011bj\u0161\u00edm zp\u016fsobem, jak zastavit galvanickou korozi mezi hlin\u00edkem a nerezovou ocel\u00ed.<\/p>\n

Hlin\u00edk m\u016f\u017eete odd\u011blit od nerezov\u00e9 oceli pomoc\u00ed plastov\u00fdch podlo\u017eek, gumov\u00fdch t\u011bsn\u011bn\u00ed, nylonov\u00fdch pouzder nebo lakovan\u00fdch povrch\u016f, kter\u00e9 p\u0159eru\u0161\u00ed elektrickou cestu.<\/strong><\/p>\n

\"Profil
Eloxovan\u00e1 bari\u00e9rov\u00e1 vrstva sni\u017euje galvanick\u00e9 reakce s nerezovou ocel\u00ed.<\/figcaption><\/figure>\n<\/p>\n

Ke galvanick\u00e9 korozi doch\u00e1z\u00ed p\u0159i dotyku dvou r\u016fzn\u00fdch kov\u016f v p\u0159\u00edtomnosti elektrolytu, nap\u0159\u00edklad vody. Jeden kov se st\u00e1v\u00e1 anodou (koroduje), druh\u00fd katodou. Hlin\u00edk je v t\u00e9to dvojici anodou, co\u017e znamen\u00e1, \u017ee rychleji degraduje.<\/p>\n

B\u011b\u017en\u00e9 izola\u010dn\u00ed materi\u00e1ly<\/h3>\n\n\n\n\n\n\n\n\n\n
Izola\u010dn\u00ed materi\u00e1l<\/th>\nKde pou\u017e\u00edt<\/th>\nPozn\u00e1mky<\/th>\n<\/tr>\n<\/thead>\n
Nylonov\u00e9 podlo\u017eky<\/td>\nMezi \u0161rouby a hlin\u00edkov\u00fdmi povrchy<\/td>\nN\u00edzk\u00e9 n\u00e1klady, snadn\u00e1 instalace<\/td>\n<\/tr>\n
Gumov\u00e1 t\u011bsn\u011bn\u00ed<\/td>\nMezi p\u0159\u00edrubami, panely<\/td>\nPoskytuje tak\u00e9 tlumen\u00ed vibrac\u00ed<\/td>\n<\/tr>\n
Plastov\u00e1 pouzdra<\/td>\nKolem \u0161roub\u016f nebo uvnit\u0159 otvor\u016f<\/td>\nPln\u011b izoluje \u0161rouby od konstrukce<\/td>\n<\/tr>\n
Pr\u00e1\u0161kov\u00e9 n\u00e1t\u011bry<\/td>\nNa hlin\u00edkov\u00fdch d\u00edlech<\/td>\nVyh\u00fdb\u00e1 se p\u0159\u00edm\u00e9mu kontaktu, pot\u0159ebuje kontrolu<\/td>\n<\/tr>\n
Vl\u00e1knit\u00e9 nebo plst\u011bn\u00e9 podlo\u017eky<\/td>\nV do\u010dasn\u00fdch nastaven\u00edch<\/td>\nNevhodn\u00e9 pro oblasti s vysokou z\u00e1t\u011b\u017e\u00ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Tyto materi\u00e1ly blokuj\u00ed elektrick\u00fd proud. \u017d\u00e1dn\u00fd proud = \u017e\u00e1dn\u00e1 galvanick\u00e1 reakce. V\u017edy zajist\u011bte \u00fapln\u00e9 odd\u011blen\u00ed, nikoli pouze ochranu na \u00farovni povrchu.<\/p>\n

<\/svg> Galvanick\u00e1 koroze vy\u017eaduje kontakt kovu a elektrolytu.<\/b>Pravda<\/span><\/p>

Pro vznik galvanick\u00e9 koroze je nutn\u00fd jak elektrick\u00fd kontakt, tak p\u0159\u00edtomnost vlhkosti nebo elektrolytu.<\/p><\/div>\n

<\/svg> Pouh\u00e9 um\u00edst\u011bn\u00ed hlin\u00edku vedle nerezov\u00e9 oceli bez kontaktu zp\u016fsob\u00ed korozi.<\/b>False<\/span><\/p>

Koroze vy\u017eaduje p\u0159\u00edm\u00fd kontakt kovu s vlhkost\u00ed, aby do\u0161lo ke galvanick\u00e9 reakci.<\/p><\/div>\n

Zabra\u0148uj\u00ed dielektrick\u00e9 povlaky galvanick\u00e9 korozi?<\/h2>\n

Rychl\u00fd n\u00e1t\u011br se zd\u00e1 b\u00fdt jednoduch\u00fd, ale skute\u010dn\u011b zastav\u00ed korozi mezi r\u016fznorod\u00fdmi kovy?<\/p>\n

Ano, dielektrick\u00e9 povlaky zabra\u0148uj\u00ed galvanick\u00e9 korozi vytvo\u0159en\u00edm izola\u010dn\u00ed vrstvy, kter\u00e1 blokuje elektrick\u00fd tok mezi hlin\u00edkem a nerezovou ocel\u00ed.<\/strong><\/p>\n

\"Hlin\u00edkov\u00fd
Hlin\u00edkov\u00fd \u00fahlov\u00fd profil ide\u00e1ln\u00ed pro izolovan\u00e9 nerezov\u00e9 \u0161roubov\u00e9 spoje<\/figcaption><\/figure>\n<\/p>\n

Dielektrick\u00e9 n\u00e1t\u011bry jsou nevodiv\u00e9 barvy nebo f\u00f3lie. Funguj\u00ed jako bari\u00e9ry mezi dv\u011bma r\u016fzn\u00fdmi kovy. Tyto povlaky zastavuj\u00ed tok elektron\u016f, co\u017e zastavuje korozn\u00ed reakci.<\/p>\n

Mezi b\u011b\u017en\u00e9 typy pat\u0159\u00ed epoxidov\u00e9, polyuretanov\u00e9 a pr\u00e1\u0161kov\u00e9 n\u00e1t\u011bry. Ty jsou u\u017eite\u010dn\u00e9 zejm\u00e9na v mo\u0159sk\u00e9m nebo venkovn\u00edm prost\u0159ed\u00ed, kde je st\u00e1le p\u0159\u00edtomna vlhkost.<\/p>\n

Typy povlak\u016f, kter\u00e9 pom\u00e1haj\u00ed p\u0159edch\u00e1zet galvanick\u00e9 korozi<\/h3>\n\n\n\n\n\n\n\n\n
Typ povlaku<\/th>\nV\u00fdhody<\/th>\nD\u00e9lka \u017eivota (odhadovan\u00e1)<\/th>\n<\/tr>\n<\/thead>\n
Epoxidov\u00e9<\/td>\nPevn\u00e9, odoln\u00e9 v\u016f\u010di chemik\u00e1li\u00edm<\/td>\n8-10 let<\/td>\n<\/tr>\n
Polyuretan<\/td>\nodoln\u00fd proti UV z\u00e1\u0159en\u00ed, pru\u017en\u00fd<\/td>\n6-8 let<\/td>\n<\/tr>\n
Pr\u00e1\u0161kov\u00e9 lakov\u00e1n\u00ed<\/td>\nOdoln\u00e9, \u0161irok\u00e9 mo\u017enosti barev<\/td>\n10-15 let<\/td>\n<\/tr>\n
Z\u00e1kladn\u00ed n\u00e1t\u011br bohat\u00fd na zinek<\/td>\nOb\u011btn\u00ed ochrana oceli<\/td>\n5-8 let<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Povlaky v\u0161ak mus\u00ed b\u00fdt souvisl\u00e9. Pokud se povlak po\u0161kr\u00e1be nebo opot\u0159ebuje, m\u016f\u017ee pod n\u00edm za\u010d\u00edt koroze. Povlakovan\u00e9 d\u00edly v\u017edy pravideln\u011b kontrolujte.<\/p>\n

<\/svg> Dielektrick\u00e9 povlaky jsou \u00fa\u010dinn\u00e9, proto\u017ee zabra\u0148uj\u00ed kontaktu kovu s kovem a pr\u016ftoku proudu.<\/b>Pravda<\/span><\/p>

Izoluj\u00ed kovy, \u010d\u00edm\u017e p\u0159eru\u0161\u00ed elektrickou cestu pot\u0159ebnou pro vznik koroze.<\/p><\/div>\n

<\/svg> Dielektrick\u00e9 povlaky funguj\u00ed, i kdy\u017e jsou naneseny pouze na jeden ze dvou kov\u016f.<\/b>False<\/span><\/p>

Oba kovov\u00e9 povrchy mus\u00ed b\u00fdt izolov\u00e1ny, aby se galvanick\u00e1 koroze zcela zastavila. Jednostrann\u00fd povlak st\u00e1le umo\u017e\u0148uje pr\u016ftok proudu.<\/p><\/div>\n

Jak vybrat spojovac\u00ed materi\u00e1l, aby nekorodoval?<\/h2>\n

Spojovac\u00ed prvky jsou \u010dasto opom\u00edjeny, p\u0159esto jsou nej\u010dast\u011bj\u0161\u00edm m\u00edstem poruch ve sm\u00ed\u0161en\u00fdch kovov\u00fdch konstrukc\u00edch.<\/p>\n

Chcete-li zabr\u00e1nit korozi, zvolte spojovac\u00ed prvky z kompatibiln\u00edch kov\u016f nebo je izolujte podlo\u017ekami, obj\u00edmkami nebo speci\u00e1ln\u00edmi n\u00e1t\u011bry.<\/strong><\/p>\n

\"Pr\u016fmyslov\u00fd
Odoln\u00fd hlin\u00edk ur\u010den\u00fd pro izolovanou mont\u00e1\u017e s nerezov\u00fdm kov\u00e1n\u00edm<\/figcaption><\/figure>\n<\/p>\n

Pou\u017eit\u00ed \u0161roub\u016f z nerezov\u00e9 oceli na hlin\u00edku zn\u00ed siln\u011b, ale vytv\u00e1\u0159\u00ed galvanick\u00fd p\u00e1r. \u010casem hlin\u00edk kolem spojovac\u00edho prvku koroduje. To oslabuje spoj a zt\u011b\u017euje demont\u00e1\u017e.<\/p>\n

Doporu\u010den\u00fd v\u00fdb\u011br upev\u0148ovac\u00edch prvk\u016f pro hlin\u00edkov\u00e9 konstrukce<\/h3>\n\n\n\n\n\n\n\n\n
Typ upev\u0148ovac\u00edho prvku<\/th>\nPozn\u00e1mky<\/th>\nRiziko koroze<\/th>\n<\/tr>\n<\/thead>\n
Hlin\u00edkov\u00e9 spojovac\u00ed prvky<\/td>\nStejn\u00fd kov, \u017e\u00e1dn\u00fd galvanick\u00fd efekt<\/td>\nVelmi n\u00edzk\u00e1<\/td>\n<\/tr>\n
Povrstven\u00e1 nerezov\u00e1 ocel<\/td>\nS izolac\u00ed nebo pokoven\u00edm<\/td>\nN\u00edzk\u00e1<\/td>\n<\/tr>\n
Pozinkovan\u00e1 ocel<\/td>\nOb\u011btn\u00ed ochrana, \u010dasem se opot\u0159ebov\u00e1v\u00e1<\/td>\nM\u00edrn\u00e1<\/td>\n<\/tr>\n
Nerezov\u00e1 ocel + nylonov\u00e9 podlo\u017eky<\/td>\nSiln\u00e9 a izolovan\u00e9<\/td>\nN\u00edzk\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Pokud mus\u00edte pou\u017e\u00edt \u0161rouby z nerezov\u00e9 oceli, kombinujte je s plastov\u00e9 nebo nylonov\u00e9 podlo\u017eky a obj\u00edmky<\/strong>. Ty zabra\u0148uj\u00ed p\u0159\u00edm\u00e9mu kontaktu. Zva\u017ete tak\u00e9 pou\u017eit\u00ed antikorozn\u00ed pasty nebo maziva b\u011bhem mont\u00e1\u017ee.<\/p>\n

<\/svg> Pou\u017eit\u00ed \u0161roub\u016f z nerezov\u00e9 oceli na hlin\u00edku v\u017edy zabra\u0148uje korozi d\u00edky jejich odolnosti.<\/b>False<\/span><\/p>

Nerezov\u00e9 \u0161rouby mohou zp\u016fsobit rychlej\u0161\u00ed korozi hlin\u00edku v d\u016fsledku galvanick\u00e9 reakce, pokud nejsou izolov\u00e1ny.<\/p><\/div>\n

<\/svg> Hlin\u00edkov\u00e9 spojovac\u00ed prvky jsou nejlep\u0161\u00ed volbou, aby se zabr\u00e1nilo galvanick\u00e9 korozi s hlin\u00edkov\u00fdmi d\u00edly.<\/b>Pravda<\/span><\/p>

Spojovac\u00ed prvky ze stejn\u00e9ho kovu zabra\u0148uj\u00ed galvanick\u00e9mu rozd\u00edlu potenci\u00e1l\u016f, kter\u00fd zp\u016fsobuje korozi.<\/p><\/div>\n

Je elektrick\u00e1 izolace nezbytn\u00e1 k zastaven\u00ed reakc\u00ed?<\/h2>\n

Nejde jen o kovy - jde o to, jak se mezi nimi pohybuj\u00ed elektrony. Bez \u00fapln\u00e9ho obvodu koroze neza\u010dne.<\/p>\n

Ano, elektrick\u00e1 izolace je nezbytn\u00e1 k zastaven\u00ed galvanick\u00e9 koroze, proto\u017ee p\u0159eru\u0161uje obvod mezi r\u016fznorod\u00fdmi kovy.<\/strong><\/p>\n

\"Hlin\u00edkov\u00fd
Hlin\u00edkov\u00fd profil s povrchovou \u00fapravou pro blokov\u00e1n\u00ed elektrochemick\u00e9 koroze<\/figcaption><\/figure>\n<\/p>\n

Galvanick\u00e1 koroze funguje jako mal\u00e1 baterie. Dvojice kov\u016f vytv\u00e1\u0159\u00ed nap\u011bt\u00ed. Vlhkost nebo jin\u00fd elektrolyt je spoj\u00ed. Elektrony proud\u00ed a hlin\u00edk se rozpou\u0161t\u00ed.<\/p>\n

Tu m\u016f\u017eete zablokovat p\u0159eru\u0161en\u00edm cesty:<\/p>\n

    \n
  1. Pou\u017e\u00edvejte plastov\u00e1 t\u011bsn\u011bn\u00ed nebo obj\u00edmky.<\/strong><\/li>\n
  2. Naneste celoplo\u0161n\u00e9 n\u00e1t\u011bry.<\/strong><\/li>\n
  3. Vyhn\u011bte se konstruk\u010dn\u00edm pastem, kter\u00e9 shroma\u017e\u010fuj\u00ed vodu.<\/strong><\/li>\n
  4. Pou\u017eijte izola\u010dn\u00ed dr\u017e\u00e1ky nebo upevn\u011bn\u00ed.<\/strong><\/li>\n<\/ol>\n

    Kontroln\u00ed seznam elektrick\u00e9 izolace<\/h3>\n\n\n\n\n\n\n\n\n
    Ak\u010dn\u00ed krok<\/th>\n\u00da\u010del<\/th>\n<\/tr>\n<\/thead>\n
    P\u0159idejte gumov\u00e9 nebo plastov\u00e9 podlo\u017eky<\/td>\nZastav\u00ed p\u0159\u00edm\u00fd elektrick\u00fd kontakt<\/td>\n<\/tr>\n
    Sty\u010dn\u00e9 plochy s barvou<\/td>\nIzoluje kov od sebe navz\u00e1jem<\/td>\n<\/tr>\n
    N\u00e1vrh odvodn\u011bn\u00ed<\/td>\nUdr\u017euje klouby such\u00e9 a bez elektrolyt\u016f<\/td>\n<\/tr>\n
    Pou\u017eit\u00ed dielektrick\u00e9 pasty<\/td>\nBlokuje vlhkost v z\u00e1vitech spojovac\u00edch prvk\u016f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Ani uzemn\u011bn\u00ed syst\u00e9mu nepom\u016f\u017ee, pokud se dva nepodobn\u00e9 kovy p\u0159\u00edmo dot\u00fdkaj\u00ed. Izolace mus\u00ed b\u00fdt fyzick\u00e1 a \u00fapln\u00e1.<\/p>\n

    <\/svg> Elektrick\u00e1 izolace zabra\u0148uje korozi t\u00edm, \u017ee zastavuje tok elektron\u016f mezi kovy.<\/b>Pravda<\/span><\/p>

    Bez vodiv\u00e9 cesty nem\u016f\u017ee doj\u00edt ke galvanick\u00e9 korozi ani v p\u0159\u00edpad\u011b p\u0159\u00edtomnosti vlhkosti.<\/p><\/div>\n

    <\/svg> K zastaven\u00ed galvanick\u00e9 koroze sta\u010d\u00ed kovovou konstrukci uzemnit.<\/b>False<\/span><\/p>

    Uzemn\u011bn\u00ed nezabr\u00e1n\u00ed galvanick\u00e9 korozi; obvod mus\u00edte p\u0159eru\u0161it izolac\u00ed.<\/p><\/div>\n

    Z\u00e1v\u011br<\/h2>\n

    Galvanick\u00e9 korozi mezi hlin\u00edkem a nerezovou ocel\u00ed lze p\u0159edch\u00e1zet. Izolujte kovy, nat\u0159ete povrchy, zvolte spr\u00e1vn\u00fd spojovac\u00ed materi\u00e1l a zastavte tok proudu vhodnou izolac\u00ed. Spr\u00e1vn\u00fdmi kroky m\u016f\u017eete tyto materi\u00e1ly bezpe\u010dn\u011b a efektivn\u011b kombinovat.<\/p>","protected":false},"excerpt":{"rendered":"

    Powder-coated surface prevents metal-to-metal corrosion When aluminum and stainless steel touch, corrosion can start silently. Left unchecked, it damages parts, weakens joints, and increases maintenance costs. You can prevent galvanic corrosion between aluminum and stainless steel by isolating the metals with non-conductive materials, coatings, or proper design. Mixing metals without planning leads to expensive repairs. […]<\/p>\n","protected":false},"author":6,"featured_media":6750,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"none","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-11861","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-custom-mold"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/11861","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/comments?post=11861"}],"version-history":[{"count":0,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/11861\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media\/6750"}],"wp:attachment":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media?parent=11861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/categories?post=11861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/tags?post=11861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}