{"id":3613,"date":"2026-08-24T17:03:26","date_gmt":"2026-08-24T09:03:26","guid":{"rendered":"https:\/\/www.c-adtech.com\/?p=3613"},"modified":"2026-08-24T17:03:26","modified_gmt":"2026-08-24T09:03:26","slug":"covering-flux-for-aluminum","status":"publish","type":"post","link":"https:\/\/www.c-adtech.com\/tr\/covering-flux-for-aluminum\/","title":{"rendered":"Al\u00fcminyum i\u00e7in Kaplama Ak\u0131s\u0131"},"content":{"rendered":"

Al\u00fcminyum i\u00e7in kaplama ak\u0131s\u0131<\/strong> is a chemical compound, usually a blend of chlorides and fluorides, spread over molten aluminum to form a protective barrier that stops oxygen and moisture from reacting with the metal surface. After testing dozens of flux formulations across different furnace types at AdTech, we can say with confidence that the right covering flux reduces metal loss by 2% to 5% per melt cycle, cuts dross formation nearly in half, and extends refractory life because the melt surface stays calmer and less turbulent. If you run a foundry, a die-casting shop, or you’re sourcing raw materials for aluminum processing, understanding how covering flux works isn’t optional knowledge, it’s a direct line to your bottom line.<\/p>\n

This piece walks through everything we’ve learned from years of formulation testing, plant visits, and direct conversations with metallurgists who use covering flux daily. We’ll cover chemistry, application rates, safety protocols, and the practical mistakes that cost operators money.<\/p>\n

Projeniz i\u00e7in Al\u00fcminyum Kaplama Ak\u0131s\u0131 kullan\u0131lmas\u0131 gerekiyorsa, \u015funlar\u0131 yapabilirsiniz: Bize ula\u015f\u0131n<\/a>\u00a0\u00fccretsiz fiyat teklifi i\u00e7in.<\/p>\n

Al\u00fcminyum i\u00e7in Kaplama Ak\u0131s\u0131 Asl\u0131nda Ne \u0130\u015fe Yarar?<\/h2>\n

Molten aluminum reacts almost instantly with atmospheric oxygen. Within seconds of exposure, a thin aluminum oxide (Al2O3) skin forms on the surface. That oxide layer sounds harmless, but it isn’t. Oxide film gets folded back into the melt during stirring, pouring, or transfer, creating inclusions that weaken castings and cause porosity defects.<\/p>\n

\"Al\u00fcminyum
Al\u00fcminyum i\u00e7in Kaplama Ak\u0131s\u0131<\/figcaption><\/figure>\n

Covering flux sits on top of the molten pool like a lid. It typically melts at a lower temperature than aluminum itself (around 500\u00b0C to 650\u00b0C compared to aluminum’s melting point near 660\u00b0C), which means it liquefies quickly and spreads across the surface before serious oxidation can occur. The molten flux layer physically blocks oxygen and water vapor from reaching the metal, and it also helps trap small oxide particles that would otherwise stay suspended in the bath.<\/p>\n

We’ve noticed operators sometimes confuse covering flux with drossing flux or degassing flux. They’re related but not interchangeable, and mixing up their functions leads to wasted material and poor melt quality.<\/p>\n

Al\u00fcminyum Kaplama Ak\u0131\u015fkan\u0131n\u0131n Arkas\u0131ndaki Kimya<\/h2>\n

Ticari kaplama ak\u0131 form\u00fclasyonlar\u0131n\u0131n \u00e7o\u011fu, alkali ve alkali toprak metal halidlerinin bir kar\u0131\u015f\u0131m\u0131na dayan\u0131r. Kesin oran, hedeflenen erime s\u0131cakl\u0131\u011f\u0131na, i\u015flenmekte olan ala\u015f\u0131ma ve d\u00f6k\u00fcmhanenin ek oksit emme kapasitesine ihtiya\u00e7 duyup duymad\u0131\u011f\u0131na ba\u011fl\u0131d\u0131r.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Bile\u015fen<\/th>\nTipik Aral\u0131k (%)<\/th>\nFonksiyon<\/th>\n<\/tr>\n<\/thead>\n
Sodyum Klor\u00fcr (NaCl)<\/td>\n20-45<\/td>\nErime noktas\u0131n\u0131 d\u00fc\u015f\u00fcr\u00fcr, temel ta\u015f\u0131y\u0131c\u0131 tuz<\/td>\n<\/tr>\n
Potasyum Klor\u00fcr (KCl)<\/td>\n15-40<\/td>\nAk\u0131\u015fkanl\u0131\u011f\u0131 art\u0131r\u0131r, NaCl ile sinerjik etki g\u00f6sterir<\/td>\n<\/tr>\n
Kriolit (Na\u2083AlF\u2086)<\/td>\n5-15<\/td>\nOksidin \u0131slanmas\u0131n\u0131 ve emilimini art\u0131r\u0131r<\/td>\n<\/tr>\n
Kalsiyum Flor\u00fcr (CaF2)<\/td>\n3-10<\/td>\nViskozite kontrol\u00fcn\u00fc art\u0131r\u0131r, c\u00fcruf ayr\u0131\u015fmas\u0131na yard\u0131mc\u0131 olur<\/td>\n<\/tr>\n
Magnezyum Klor\u00fcr (MgCl\u2082)<\/td>\n2-8<\/td>\nErime noktas\u0131 d\u00fc\u015f\u00fc\u015f\u00fcn\u00fc azalt\u0131r<\/td>\n<\/tr>\n
Karnalit (KCl\u00b7MgCl\u2082)<\/td>\n0-10<\/td>\nEski form\u00fclasyonlarda yayg\u0131n olarak kullan\u0131l\u0131r, yap\u0131\u015fmay\u0131 azalt\u0131r<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The NaCl-KCl eutectic mixture forms the backbone of nearly every covering flux we’ve examined, because that combination melts around 650\u00b0C, right in the working range foundries need. Fluoride additions like cryolite improve what metallurgists call “wetting,” meaning the flux spreads thin and even instead of clumping in one spot.<\/p>\n

We should mention something that doesn’t get discussed enough in supplier brochures: the ratio between chlorides and fluorides changes how aggressively the flux reacts with refractory linings. Higher fluoride content improves oxide separation but can accelerate wear on furnace linings over hundreds of cycles. This is a trade-off every purchasing manager should weigh against furnace maintenance budgets.<\/p>\n

Kaplama Ak\u0131s\u0131, C\u00fcruf Olu\u015fturucu Ak\u0131 ve Ar\u0131tma Ak\u0131s\u0131<\/h2>\n

Ak\u0131 kategorileri aras\u0131ndaki kar\u0131\u015f\u0131kl\u0131k, tesis teknisyenleriyle, \u00f6zellikle de al\u00fcminyum eritme i\u015flemlerine yeni ba\u015flayanlarla konu\u015furken kar\u015f\u0131la\u015ft\u0131\u011f\u0131m\u0131z en yayg\u0131n sorunlardan biridir. Her ak\u0131 t\u00fcr\u00fc, eritme s\u00fcrecinin belirli bir a\u015famas\u0131na hizmet eder.<\/p>\n

\"Erimi\u015f
Erimi\u015f al\u00fcminyumun i\u015flenmesi ve eriyik kalitesinin iyile\u015ftirilmesi amac\u0131yla kullan\u0131lan kaplama tozu, c\u00fcruf olu\u015fturucu toz ve ar\u0131tma tozu gibi al\u00fcminyum toz t\u00fcrlerinin kar\u015f\u0131la\u015ft\u0131r\u0131lmas\u0131.<\/figcaption><\/figure>\n
\n\n\n\n\n\n\n\n\n
Ak\u0131 Tipi<\/th>\nTemel Ama\u00e7<\/th>\nUygulama Zamanlamas\u0131<\/th>\nTipik Dozaj<\/th>\n<\/tr>\n<\/thead>\n
\u00d6rt\u00fcc\u00fc Ak\u0131<\/td>\nOksidasyonu \u00f6nler, koruyucu bir tabaka olu\u015fturur<\/td>\n\u015earj i\u015fleminden hemen sonra, eriyik tam s\u0131cakl\u0131\u011fa ula\u015fmadan uygulan\u0131r<\/td>\nMetal tonu ba\u015f\u0131na 0,5-2 kg<\/td>\n<\/tr>\n
Drossing Flux<\/a><\/td>\nC\u00fcrufta hapsolmu\u015f metalik al\u00fcminyumu ay\u0131r\u0131r<\/td>\nC\u00fcruf s\u0131y\u0131rma i\u015fleminden \u00f6nce uygulan\u0131r<\/td>\nMetal tonu ba\u015f\u0131na 1-3 kg<\/td>\n<\/tr>\n
Rafine Ak\u0131<\/a><\/td>\nErimi\u015f malzemeden metalik olmayan kal\u0131nt\u0131lar\u0131 giderir<\/td>\nD\u00f6k\u00fcmden \u00f6nce, d\u00f6ng\u00fcn\u00fcn ortas\u0131nda uygulan\u0131r<\/td>\nMetal tonu ba\u015f\u0131na 0,3-1 kg<\/td>\n<\/tr>\n
Gaz Giderici Ak\u0131<\/td>\n\u00c7\u00f6z\u00fcnm\u00fc\u015f hidrojeni giderir<\/td>\nD\u00f6kmeden 10-15 dakika \u00f6nce uygulan\u0131r<\/td>\nMetal tonu ba\u015f\u0131na 0,1-0,5 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Covering flux stays on top of the melt the entire time metal sits in the furnace. Drossing flux is worked into the skimmings specifically to recover metal that would otherwise be lost. Refining and degassing serve completely separate chemical purposes and shouldn’t be substituted for a good covering layer.<\/p>\n

We’ve seen shops try to save money by using a single “universal” flux for all four functions. It rarely works well. General-purpose flux compromises on every function to some degree, and the metal loss savings from proper covering flux alone usually pay back the cost difference within weeks.<\/p>\n

Al\u00fcminyumun Erime S\u0131ras\u0131nda Neden Bu Kadar H\u0131zl\u0131 Oksitlendi\u011fi<\/h2>\n

Aluminum has a strong natural affinity for oxygen, stronger than iron, copper, or zinc. The reaction that forms aluminum oxide releases a large amount of energy (it’s exothermic), which is part of why the oxide skin forms almost instantaneously on exposure to air.<\/p>\n

There’s a secondary problem beyond simple surface oxidation: hydrogen absorption. Molten aluminum can dissolve hydrogen from moisture in the atmosphere or from damp charge materials. When the metal solidifies, that dissolved hydrogen comes out of solution and creates porosity inside the casting. A good covering flux doesn’t eliminate hydrogen pickup entirely, but by reducing surface turbulence and blocking moisture contact, it lowers the overall hydrogen content picked up during the hold time.<\/p>\n

Bunu, uygun \u015fekilde form\u00fcle edilmi\u015f bir kaplama ak\u0131s\u0131 kullanmaya ge\u00e7meden \u00f6nce ve sonra, bir m\u00fc\u015fteri tesisinde d\u00fc\u015f\u00fck bas\u0131n\u00e7 testi (RPT) uygulayarak \u00f6l\u00e7t\u00fck. Di\u011fer hi\u00e7bir proses de\u011fi\u015fkeninde de\u011fi\u015fiklik yap\u0131lmadan, ak\u0131n\u0131n tutarl\u0131 bir \u015fekilde uygulanmas\u0131ndan sonraki iki hafta i\u00e7inde g\u00f6zeneklilik de\u011ferleri, yakla\u015f\u0131k 8% olan yo\u011funluk indeksinden 3%\u2019nin alt\u0131na d\u00fc\u015ft\u00fc.<\/p>\n

Ala\u015f\u0131m\u0131n\u0131z \u0130\u00e7in Do\u011fru Kaplama Ak\u0131s\u0131n\u0131 Se\u00e7me<\/h2>\n

Her al\u00fcminyum ala\u015f\u0131m\u0131, belirli bir eriyik bile\u015fimine ayn\u0131 \u015fekilde tepki vermez. Y\u00fcksek magnezyumlu ala\u015f\u0131mlar (5000 serisi), y\u00fcksek silikonlu d\u00f6k\u00fcm ala\u015f\u0131mlar\u0131ndan (300 serisi) farkl\u0131 bir i\u015fleme gerektirir; \u00e7\u00fcnk\u00fc magnezyum, baz\u0131 eriyik bile\u015fenleriyle daha \u015fiddetli bir \u015fekilde reaksiyona girer.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Ala\u015f\u0131m Ailesi<\/th>\nTipik Ala\u015f\u0131mlar<\/th>\nAk\u0131 Dikkate Al\u0131nmas\u0131<\/th>\n<\/tr>\n<\/thead>\n
1000 Serisi (Saf Al\u00fcminyum)<\/td>\n1050, 1100<\/td>\nStandart NaCl\/KCl baz\u0131 iyi sonu\u00e7 verir; d\u00fc\u015f\u00fck flor\u00fcr miktar\u0131 yeterlidir<\/td>\n<\/tr>\n
3000 Serisi (Manganez)<\/td>\n3003, 3004<\/td>\nStandart kaplama ak\u0131s\u0131, orta d\u00fczeyde kriyolit i\u00e7eri\u011fi<\/td>\n<\/tr>\n
5000 Serisi (Magnezyum)<\/td>\n5052, 5083<\/td>\nMg reaktivitesini kontrol alt\u0131na almak i\u00e7in daha y\u00fcksek flor\u00fcr i\u00e7eri\u011fi gerektirir<\/td>\n<\/tr>\n
6000 Serisi (Mg-Si)<\/td>\n6061, 6063<\/td>\nDengeli klor\u00fcr\/flor\u00fcr kar\u0131\u015f\u0131m\u0131 \u00f6nerilir<\/td>\n<\/tr>\n
7000 Serisi (\u00c7inko)<\/td>\n7075<\/td>\nGerilme korozyonu sorunlar\u0131n\u0131 \u00f6nlemek i\u00e7in \u00f6zel olarak geli\u015ftirilmi\u015f, d\u00fc\u015f\u00fck sodyum i\u00e7erikli eriyik<\/td>\n<\/tr>\n
300 Serisi D\u00f6k\u00fcm Ala\u015f\u0131mlar\u0131<\/td>\nA356, A380<\/td>\n\u0130yi c\u00fcruf ay\u0131rma \u00f6zelli\u011fine sahip, y\u00fcksek ak\u0131\u015fkanl\u0131kl\u0131 eriyik<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Magnesium-bearing alloys deserve particular attention. Magnesium burns more readily than aluminum and can react violently with certain chloride salts if the flux isn’t formulated correctly. We always recommend requesting a technical data sheet from your flux supplier that specifically states compatibility with your alloy family, not just generic “aluminum covering flux” labeling.<\/p>\n

\"kaplama
kaplama ak\u0131 tozu<\/figcaption><\/figure>\n

Uygulama Y\u00f6ntemleri ve En \u0130yi Uygulamalar<\/h2>\n

Getting flux chemistry right matters, but application technique determines whether that chemistry actually performs. We’ve watched experienced operators get excellent results from average flux, and we’ve watched premium flux underperform because of poor application habits.<\/p>\n

Zamanlama, \u00e7o\u011fu insan\u0131n fark etti\u011finden daha \u00f6nemlidir.<\/strong>\u00a0Yeterli miktarda s\u0131v\u0131 metal olu\u015fup ak\u0131\u015fkanl\u0131\u011f\u0131 tutabilecek hale gelir gelmez, genellikle y\u00fck\u00fcn yakla\u015f\u0131k 30%\u2019si eridi\u011finde, ak\u0131\u015fkan eriyik y\u00fczeyine uygulanmal\u0131d\u0131r. Y\u00fck\u00fcn tamam\u0131n\u0131n erimesini beklemek, oksidasyonun kontrols\u00fcz bir \u015fekilde ilerlemesi i\u00e7in daha fazla zaman tan\u0131r.<\/p>\n

Da\u011f\u0131l\u0131m\u0131n e\u015fit olmas\u0131 gerekir.<\/strong>\u00a0F\u0131r\u0131n\u0131n bir k\u00f6\u015fesine toz ak\u0131 serpmek, a\u00e7\u0131kta kalan y\u00fczeyin geri kalan\u0131 i\u00e7in neredeyse hi\u00e7bir i\u015fe yaramaz. Elle uygulama, t\u00fcm eritme alan\u0131 boyunca geni\u015f hareketler yaparak ger\u00e7ekle\u015ftirilmelidir. Daha b\u00fcy\u00fck f\u0131r\u0131nlarda, malzemeyi elle k\u00fcrekle serpmekten \u00e7ok daha tutarl\u0131 bir \u015fekilde da\u011f\u0131tan mekanik ak\u0131 da\u011f\u0131t\u0131m sistemlerinin kullan\u0131lmas\u0131 faydal\u0131d\u0131r.<\/p>\n

Miktar, sadece tonajla de\u011fil, y\u00fczey alan\u0131yla da uyumlu olmal\u0131d\u0131r.<\/strong>\u00a0S\u0131\u011f ve geni\u015f bir f\u0131r\u0131n, derin ve dar bir f\u0131r\u0131na k\u0131yasla metal tonu ba\u015f\u0131na daha fazla a\u00e7\u0131k y\u00fczeye sahiptir; bu nedenle, dozaj hesaplamalar\u0131, yaln\u0131zca a\u011f\u0131rl\u0131\u011fa dayal\u0131 genel kurallara dayanmak yerine bu geometriyi yans\u0131tmal\u0131d\u0131r.<\/p>\n

\n\n\n\n\n\n\n\n\n
F\u0131r\u0131n Tipi<\/th>\nY\u00fczey Alan\u0131 Katsay\u0131s\u0131<\/th>\n\u00d6nerilen Ak\u0131\u015f H\u0131z\u0131<\/th>\n<\/tr>\n<\/thead>\n
Yank\u0131lanmal\u0131 F\u0131r\u0131n<\/td>\nY\u00fcksek maruz kalma<\/td>\n1,5-2,0 kg\/ton<\/td>\n<\/tr>\n
\u0130nd\u00fcksiyon F\u0131r\u0131n\u0131<\/td>\nOrta derecede maruz kalma<\/td>\n0,8-1,2 kg\/ton<\/td>\n<\/tr>\n
Pota F\u0131r\u0131n\u0131<\/td>\nD\u00fc\u015f\u00fck ila orta d\u00fczeyde maruz kalma<\/td>\n1,0\u20131,5 kg\/ton<\/td>\n<\/tr>\n
D\u00f6ner F\u0131r\u0131n<\/td>\nOrta d\u00fczeyde maruz kalma, d\u00f6nen eriyik<\/td>\n1,2\u20131,8 kg\/ton<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Genel olarak, yeni operat\u00f6rlere, en y\u00fcksek dozaj\u0131n otomatik olarak en iyi sonucu verece\u011fini varsaymak yerine, \u00f6nerilen aral\u0131\u011f\u0131n alt s\u0131n\u0131r\u0131ndan ba\u015flamalar\u0131n\u0131 ve birka\u00e7 \u00fcretim d\u00f6ng\u00fcs\u00fc boyunca g\u00f6zle g\u00f6r\u00fcl\u00fcr c\u00fcruf olu\u015fumu ve metal geri kazan\u0131m verilerine g\u00f6re dozaj\u0131 yukar\u0131 do\u011fru ayarlamalar\u0131n\u0131 tavsiye ederiz. A\u015f\u0131r\u0131 ak\u0131 kullan\u0131m\u0131 malzeme israf\u0131na yol a\u00e7ar, duman olu\u015fumunu art\u0131r\u0131r ve zamanla refrakterlerin a\u015f\u0131nmas\u0131na neden olabilir.
\n