{"id":11862,"date":"2025-08-16T08:00:25","date_gmt":"2025-08-16T08:00:25","guid":{"rendered":"https:\/\/sinoextrud.com\/?p=11862"},"modified":"2025-08-16T08:00:25","modified_gmt":"2025-08-16T08:00:25","slug":"reaguje-nerezova-ocel-s-hlinikem","status":"publish","type":"post","link":"https:\/\/sinoextrud.com\/cs\/will-stainless-steel-react-with-aluminum\/","title":{"rendered":"Bude nerezov\u00e1 ocel reagovat s hlin\u00edkem?"},"content":{"rendered":"

\"eloxovan\u00fd
Eloxovan\u00e1 hlin\u00edkov\u00e1 vrstva odol\u00e1v\u00e1 elektrick\u00e9 reakci s nerezovou ocel\u00ed.<\/figcaption><\/figure>\n<\/p>\n

Kombinace nerezov\u00e9 oceli a hlin\u00edku se m\u016f\u017ee zd\u00e1t ne\u0161kodn\u00e1, ale jejich vz\u00e1jemn\u00e1 reakce m\u016f\u017ee \u010dasem zp\u016fsobit tichou korozi konstrukce.<\/p>\n

Ano, nerezov\u00e1 ocel m\u016f\u017ee reagovat s hlin\u00edkem galvanickou koroz\u00ed, kdy\u017e mezi nimi vlhkost vytvo\u0159\u00ed elektrickou cestu.<\/strong><\/p>\n

Tato reakce neprob\u00edh\u00e1 okam\u017eit\u011b. Ale jakmile jednou za\u010dne, je t\u011b\u017ek\u00e9 ji zastavit. Poj\u010fme prozkoumat, jak j\u00ed zabr\u00e1nit pomoc\u00ed chytr\u00e9ho designu a materi\u00e1l\u016f.<\/p>\n

Pro\u010d doch\u00e1z\u00ed ke korozi p\u0159i kontaktu t\u011bchto kov\u016f?<\/h2>\n

Na prvn\u00ed pohled se oba kovy zdaj\u00ed b\u00fdt pevn\u00e9 a odoln\u00e9. Chemie v\u0161ak vypr\u00e1v\u00ed jin\u00fd p\u0159\u00edb\u011bh.<\/p>\n

Kontakt mezi nerezovou ocel\u00ed a hlin\u00edkem zp\u016fsobuje korozi, proto\u017ee maj\u00ed rozd\u00edln\u00e9 elektrochemick\u00e9 potenci\u00e1ly a v p\u0159\u00edtomnosti elektrolytu vyvol\u00e1vaj\u00ed galvanickou reakci.<\/strong><\/p>\n

\"Pr\u00e1\u0161kov\u011b
Pr\u00e1\u0161kov\u00e9 lakov\u00e1n\u00ed zabra\u0148uje galvanick\u00e9mu proudu mezi r\u016fznorod\u00fdmi kovy.<\/figcaption><\/figure>\n<\/p>\n

Galvanick\u00e1 koroze vznik\u00e1, kdy\u017e se dva nepodobn\u00e9 kovy dot\u00fdkaj\u00ed a jsou spojeny elektrolytem, nap\u0159\u00edklad vodou. V t\u00e9to dvojici, hlin\u00edk se st\u00e1v\u00e1 anodou<\/strong> (koroduje) a nerezov\u00e1 ocel slou\u017e\u00ed jako katoda<\/strong> (z\u016fst\u00e1v\u00e1 neporu\u0161en\u00fd).<\/p>\n

To je d\u00e1no jejich pozic\u00ed v galvanick\u00e9 \u0159ad\u011b. \u010c\u00edm d\u00e1le jsou dva kovy v tomto diagramu od sebe, t\u00edm intenzivn\u011bj\u0161\u00ed je reakce.<\/p>\n

Sn\u00edmek galvanick\u00e9 \u0159ady (v mo\u0159sk\u00e9 vod\u011b)<\/h3>\n\n\n\n\n\n\n\n\n
Kov<\/th>\nPozice v s\u00e9rii<\/th>\nRiziko koroze (v kombinaci s nerezov\u00fdm materi\u00e1lem)<\/th>\n<\/tr>\n<\/thead>\n
Ho\u0159\u010d\u00edk<\/td>\nVelmi anodick\u00fd<\/td>\nVelmi vysok\u00e1<\/td>\n<\/tr>\n
Hlin\u00edk<\/td>\nAnodick\u00e9<\/td>\nVysok\u00e1<\/td>\n<\/tr>\n
Zinek<\/td>\nM\u00e9n\u011b anodick\u00e9<\/td>\nSt\u0159edn\u00ed<\/td>\n<\/tr>\n
Nerezov\u00e1 ocel<\/td>\nKatodick\u00e9<\/td>\n\u017d\u00e1dn\u00e9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Elektrolyt funguje jako m\u016fstek. Bez vlhkosti se tento obvod nem\u016f\u017ee dokon\u010dit. Jakmile je v\u0161ak vystaven p\u016fsoben\u00ed vody - zejm\u00e9na slan\u00e9 vody - koroze se rychle urychluje.<\/p>\n

<\/svg> Ke galvanick\u00e9 korozi doch\u00e1z\u00ed pouze tehdy, kdy\u017e se dva kovy dot\u00fdkaj\u00ed a je p\u0159\u00edtomna vlhkost.<\/b>Pravda<\/span><\/p>

Pro vznik galvanick\u00e9 koroze je nutn\u00fd jak elektrick\u00fd kontakt, tak elektrolyt.<\/p><\/div>\n

<\/svg> Hlin\u00edk zp\u016fsobuje korozi nerezov\u00e9 oceli, pokud je ponech\u00e1n v kontaktu s venkovn\u00edm prost\u0159ed\u00edm.<\/b>False<\/span><\/p>

Hlin\u00edk je ve dvojici anodou; koroduje, zat\u00edmco nerezov\u00e1 ocel z\u016fst\u00e1v\u00e1 chr\u00e1n\u011bna.<\/p><\/div>\n

Mohou se nepodobn\u00e9 kovy dot\u00fdkat ve venkovn\u00edm prost\u0159ed\u00ed?<\/h2>\n

Je l\u00e1kav\u00e9 se k nim p\u0159ipojit a zapomenout. To v\u0161ak \u010dasto vede k pozd\u011bj\u0161\u00edm n\u00e1kladn\u00fdm \u0161kod\u00e1m.<\/p>\n

Ano, nepodobn\u00e9 kovy se mohou ve venkovn\u00edm prost\u0159ed\u00ed dot\u00fdkat, ale pouze pokud jsou \u0159\u00e1dn\u011b izolov\u00e1ny nebo pota\u017eeny, aby se zabr\u00e1nilo galvanick\u00e9 korozi.<\/strong><\/p>\n

\"Hlin\u00edkov\u00fd
Hlin\u00edkov\u00e9 \u017ealuzie s povrchovou \u00fapravou pro mo\u0159sk\u00e9 nebo vlhk\u00e9 prost\u0159ed\u00ed<\/figcaption><\/figure>\n<\/p>\n

Venkovn\u00ed podm\u00ednky jsou pro galvanickou korozi ide\u00e1ln\u00ed: d\u00e9\u0161\u0165, rosa, kondenzace a zne\u010di\u0161t\u011bn\u00ed. Dokonce i vlhkost m\u016f\u017ee vytvo\u0159it lehkou elektrolytovou vrstvu.<\/p>\n

P\u0159esto se v mnoha venkovn\u00edch proveden\u00edch pou\u017e\u00edv\u00e1 hlin\u00edk a nerezov\u00e1 ocel spole\u010dn\u011b. Kl\u00ed\u010dem k \u00fasp\u011bchu je zabr\u00e1nit p\u0159\u00edm\u00e9mu kontaktu<\/strong> a p\u0159eru\u0161en\u00ed elektrick\u00e9 cesty<\/strong>.<\/p>\n

Venkovn\u00ed metody ochrany<\/h3>\n\n\n\n\n\n\n\n\n
Strategie<\/th>\nJak pom\u00e1h\u00e1<\/th>\n<\/tr>\n<\/thead>\n
Plastov\u00e9 nebo pry\u017eov\u00e9 distan\u010dn\u00ed podlo\u017eky<\/td>\nP\u0159eru\u0161\u00ed elektrick\u00fd obvod<\/td>\n<\/tr>\n
Dielektrick\u00e9 povlaky<\/td>\nZastav\u00ed tok elektron\u016f<\/td>\n<\/tr>\n
Odvod\u0148ovac\u00ed otvory<\/td>\nZabra\u0148uje hromad\u011bn\u00ed vody<\/td>\n<\/tr>\n
Strategick\u00fd design<\/td>\nMinimalizuje kontaktn\u00ed plochy<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Vyvarujte se tak\u00e9 zadr\u017eov\u00e1n\u00ed vlhkosti ve sp\u00e1r\u00e1ch. Pou\u017e\u00edvejte \u0161ikm\u00e9 plochy, v\u011btr\u00e1n\u00ed nebo t\u011bsn\u011bn\u00ed, kter\u00e1 rychle vysychaj\u00ed. Pokud mus\u00ed b\u00fdt kov odhalen, p\u0159idejte ob\u011btav\u00fd n\u00e1t\u011br nebo pl\u00e1nujte pravideln\u00e9 kontroly.<\/p>\n

<\/svg> Hlin\u00edk a nerezovou ocel lze spojovat ve venkovn\u00edm prost\u0159ed\u00ed, pokud jsou pou\u017eity izola\u010dn\u00ed materi\u00e1ly.<\/b>Pravda<\/span><\/p>

Izola\u010dn\u00ed materi\u00e1ly zabra\u0148uj\u00ed elektrick\u00e9mu spojen\u00ed, kter\u00e9 zp\u016fsobuje galvanickou korozi.<\/p><\/div>\n

<\/svg> Venkovn\u00ed vlhkost nesta\u010d\u00ed k tomu, aby mezi r\u016fznorod\u00fdmi kovy vznikla koroze.<\/b>False<\/span><\/p>

I lehk\u00e1 vlhkost m\u016f\u017ee p\u016fsobit jako elektrolyt, zejm\u00e9na ve zne\u010di\u0161t\u011bn\u00e9m nebo slan\u00e9m vzduchu.<\/p><\/div>\n

Jakou roli hraje v jejich reakci vlhkost?<\/h2>\n

Vlhkost se m\u016f\u017ee zd\u00e1t ne\u0161kodn\u00e1, ale u spoj\u016f ze sm\u00ed\u0161en\u00fdch kov\u016f hraje v\u00fdznamnou roli p\u0159i destrukci.<\/p>\n

Vlhkost p\u016fsob\u00ed p\u0159i galvanick\u00e9 korozi jako elektrolyt a umo\u017e\u0148uje tok elektron\u016f mezi hlin\u00edkem a nerezovou ocel\u00ed.<\/strong><\/p>\n

\"Dekorativn\u00ed
Lemov\u00e1n\u00ed hran s povrchovou bari\u00e9rou pro sn\u00ed\u017een\u00ed reakce hlin\u00edku s nerezovou ocel\u00ed<\/figcaption><\/figure>\n<\/p>\n

\u010cist\u00e1 voda je slab\u00fd vodi\u010d. V re\u00e1ln\u00e9m sv\u011bt\u011b v\u0161ak voda \u010dasto obsahuje soli, prach, kyseliny nebo pr\u016fmyslov\u00e9 \u0161kodliviny. Ty zvy\u0161uj\u00ed jej\u00ed vodivost a \u010din\u00ed z n\u00ed siln\u00fd elektrolyt.<\/p>\n

Bez vlhkosti se hlin\u00edk a nerezov\u00e1 ocel mohou dot\u00fdkat bez v\u011bt\u0161\u00edch probl\u00e9m\u016f. Jakmile se v\u0161ak do nich dostane voda - i jen v podob\u011b kondenzace - za\u010dne prob\u00edhat elektrochemick\u00e1 reakce.<\/p>\n

Zdroje vlhkosti, kter\u00e9 vyvol\u00e1vaj\u00ed galvanickou korozi<\/h3>\n\n\n\n\n\n\n\n\n
Zdroj:<\/th>\nB\u011b\u017en\u00e9 v t\u011bchto nastaven\u00edch<\/th>\n<\/tr>\n<\/thead>\n
D\u00e9\u0161\u0165 nebo sn\u00edh<\/td>\nVenkovn\u00ed n\u00e1bytek, konstrukce, oplocen\u00ed<\/td>\n<\/tr>\n
Kondenzace<\/td>\nHVAC, chladic\u00ed jednotky<\/td>\n<\/tr>\n
Soln\u00fd sprej<\/td>\nPob\u0159e\u017en\u00ed budovy, lod\u011b, p\u0159\u00edstavy<\/td>\n<\/tr>\n
Pr\u016fmyslov\u00e1 mlha<\/td>\nTov\u00e1rny, chemick\u00e9 z\u00f3ny<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Pokud je vlhkost nevyhnuteln\u00e1, mus\u00edte p\u0159eru\u0161en\u00ed obvodu<\/strong>. To znamen\u00e1 n\u00e1t\u011bry, izola\u010dn\u00ed podlo\u017eky nebo izola\u010dn\u00ed materi\u00e1ly.<\/p>\n

<\/svg> Bez vlhkosti nem\u016f\u017ee doj\u00edt ke galvanick\u00e9 korozi, i kdy\u017e se kovy dot\u00fdkaj\u00ed.<\/b>Pravda<\/span><\/p>

Pro vznik koroze je zapot\u0159eb\u00ed elektrolyt, kter\u00fd uzav\u0159e obvod.<\/p><\/div>\n

<\/svg> Jak\u00fdkoli druh vody, dokonce i destilovan\u00e1, okam\u017eit\u011b vyvol\u00e1 galvanickou korozi.<\/b>False<\/span><\/p>

\u010cist\u00e1 destilovan\u00e1 voda m\u00e1 velmi n\u00edzkou vodivost a nesta\u010d\u00ed k tomu, aby zp\u016fsobila rychlou korozi.<\/p><\/div>\n

Jak navrhovat konstrukce, aby nedoch\u00e1zelo k reakc\u00edm s kovy?<\/h2>\n

\u0160patn\u00fd n\u00e1vrh vede k rychl\u00e9mu selh\u00e1n\u00ed. Chytr\u00e9 uspo\u0159\u00e1d\u00e1n\u00ed v\u0161ak umo\u017e\u0148uje bezpe\u010dnou koexistenci hlin\u00edku a nerezov\u00e9 oceli.<\/p>\n

Chcete-li zabr\u00e1nit reakc\u00edm kov\u016f, navrhn\u011bte konstrukce tak, aby se nepodobn\u00e9 kovy nedot\u00fdkaly, z\u016fstaly such\u00e9 nebo byly odd\u011bleny nevodiv\u00fdmi materi\u00e1ly.<\/strong><\/p>\n

\"Odoln\u00fd
Hlin\u00edkov\u00fd r\u00e1mov\u00fd profil navr\u017een\u00fd pro bezpe\u010dnou integraci s r\u016fznorod\u00fdmi kovy.<\/figcaption><\/figure>\n<\/p>\n

Za\u010dn\u011bte t\u00edm, \u017ee porozum\u00edte sv\u00e9mu prost\u0159ed\u00ed. Je vlhk\u00e9, p\u0159\u00edmo\u0159sk\u00e9 nebo vystaven\u00e9 p\u016fsoben\u00ed chemick\u00fdch l\u00e1tek? Pokud ano, p\u0159i n\u00e1vrhu myslete na odvodn\u011bn\u00ed a v\u011btr\u00e1n\u00ed.<\/p>\n

D\u00e1le vyberte kompatibiln\u00ed spojovac\u00ed materi\u00e1l a truhl\u00e1\u0159sk\u00e9 v\u00fdrobky. Nebo je zcela zaizolujte. Rovn\u011b\u017e minimalizujte odkrytou plochu hlin\u00edku ve srovn\u00e1n\u00ed s nerezovou ocel\u00ed - t\u00edm se sn\u00ed\u017e\u00ed rychlost koroze.<\/p>\n

Konstruk\u010dn\u00ed tipy pro zamezen\u00ed galvanick\u00fdch reakc\u00ed<\/h3>\n\n\n\n\n\n\n\n\n\n
Funkce designu<\/th>\nBenefit<\/th>\n<\/tr>\n<\/thead>\n
Sva\u017eit\u00e9 povrchy<\/td>\nZabra\u0148uje vzniku stojat\u00e9 vody<\/td>\n<\/tr>\n
T\u011bsn\u011bn\u00e9 spoje<\/td>\nZabra\u0148uje vnik\u00e1n\u00ed vody<\/td>\n<\/tr>\n
Povrstven\u00e9 spojovac\u00ed prvky<\/td>\nDod\u00e1v\u00e1 dodate\u010dnou ochranu<\/td>\n<\/tr>\n
Nylonov\u00e9 podlo\u017eky a pouzdra<\/td>\nFyzicky odd\u011blen\u00e9 kovy<\/td>\n<\/tr>\n
Pl\u00e1novan\u00e9 kontroly<\/td>\nZachycen\u00ed probl\u00e9m\u016f v\u010das, ne\u017e se roz\u0161\u00ed\u0159\u00ed koroze<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Nezapome\u0148te na n\u00e1t\u011br! Dob\u0159e nanesen\u00e1 jednoduch\u00e1 vrstva n\u00e1t\u011bru m\u016f\u017ee zdvojn\u00e1sobit \u017eivotnost sm\u00ed\u0161en\u00e9 kovov\u00e9 konstrukce.<\/p>\n

<\/svg> Konstrukce se \u0161ikm\u00fdmi povrchy a spr\u00e1vn\u00fdm odvodn\u011bn\u00edm sni\u017euje riziko galvanick\u00e9 koroze.<\/b>Pravda<\/span><\/p>

Udr\u017eov\u00e1n\u00ed vlhkosti mimo dosah zabra\u0148uje tvorb\u011b elektrolytu a zastavuje reakci.<\/p><\/div>\n

<\/svg> Pou\u017eit\u00ed v\u011bt\u0161\u00edch hlin\u00edkov\u00fdch ploch vedle mal\u00fdch d\u00edl\u016f z nerezov\u00e9 oceli sni\u017euje riziko koroze.<\/b>False<\/span><\/p>

V\u011bt\u0161\u00ed anodick\u00e9 plochy s mal\u00fdmi katodick\u00fdmi plochami zhor\u0161uj\u00ed korozi t\u00edm, \u017ee soust\u0159e\u010fuj\u00ed proud na hlin\u00edk.<\/p><\/div>\n

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

Nerezov\u00e1 ocel a hlin\u00edk mohou p\u0159i spojov\u00e1n\u00ed reagovat, zejm\u00e9na ve venkovn\u00edm prost\u0159ed\u00ed. T\u00e9to korozi v\u0161ak lze zabr\u00e1nit p\u0159eru\u0161en\u00edm elektrick\u00e9 cesty, p\u0159id\u00e1n\u00edm n\u00e1t\u011br\u016f a pou\u017eit\u00edm chytr\u00e9ho designu. P\u0159i pl\u00e1nov\u00e1n\u00ed m\u016f\u017eete bezpe\u010dn\u011b pou\u017e\u00edt oba kovy v jedn\u00e9 konstrukci.<\/p>","protected":false},"excerpt":{"rendered":"

Anodized aluminum layer resists electrical reaction with stainless steel Combining stainless steel and aluminum may seem harmless, but the reaction between them can silently corrode structures over time. Yes, stainless steel can react with aluminum through galvanic corrosion when moisture creates an electrical path between them. This reaction doesn\u2019t happen instantly. But once it begins, […]<\/p>\n","protected":false},"author":6,"featured_media":6039,"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-11862","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\/11862","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=11862"}],"version-history":[{"count":0,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/11862\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media\/6039"}],"wp:attachment":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media?parent=11862"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/categories?post=11862"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/tags?post=11862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}