![\"Gaz](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Degassing-Method-1.jpg\")
<\/p>\nTemel gaz giderme y\u00f6ntemi, y\u00fczd\u00fcrme y\u00f6ntemidir. Bu y\u00f6ntemin \u00e7al\u0131\u015fma prensibi, al\u00fcminyum eriyi\u011fine gaz veya gaz \u00fcreten maddeler vererek kabarc\u0131klar olu\u015fturmakt\u0131r. K\u0131smi bas\u0131n\u00e7 fark\u0131 prensibine g\u00f6re, al\u00fcminyum eriyi\u011finde \u00e7\u00f6z\u00fcnm\u00fc\u015f hidrojen, bas\u0131n\u00e7 fark\u0131n\u0131n etkisi alt\u0131ndad\u0131r. Kabarc\u0131k, s\u0131v\u0131 y\u00fczeyine y\u00fckseldi\u011finde kabarc\u0131\u011f\u0131n i\u00e7ine dif\u00fcze olan hidrojen, kabarc\u0131kla birlikte atmosfere girer. Ayn\u0131 zamanda, kabarc\u0131k y\u00fczeyi kal\u0131nt\u0131lar\u0131 otomatik olarak adsorbe edebilir ve kal\u0131nt\u0131lar s\u0131v\u0131 y\u00fczeyine y\u00fckselerek c\u00fcruf olu\u015fturur.<\/p>\n
Al\u00fcminyum i\u015fleme s\u00fcrecinin ilk a\u015famas\u0131 olarak, k\u00fct\u00fc\u011f\u00fcn eritme i\u015fleminden kaynaklanan do\u011fal kusurlar\u0131 (kapan\u0131mlar vb.) varsa, ne kadar geli\u015fmi\u015f teknoloji veya ekipman kullan\u0131l\u0131rsa kullan\u0131ls\u0131n, bu k\u00fct\u00fck sonraki bir dizi i\u015fleme s\u00fcrecinde (haddeleme, ekstr\u00fczyon, \u0131s\u0131l i\u015flem, y\u00fczey i\u015fleme vb.) bu do\u011fu\u015ftan gelen kusuru telafi etmek amac\u0131yla kullan\u0131lamaz ve bu durumda al\u00fcminyum \u00fcr\u00fcnlerin kalitesini ve performans\u0131n\u0131 sa\u011flamak zordur. Bu nedenle, malzemenin potansiyelini tam olarak ortaya \u00e7\u0131karmak ve kendi performans\u0131n\u0131 en \u00fcst d\u00fczeye \u00e7\u0131karmak i\u00e7in \u00f6ncelikle d\u00f6k\u00fcm k\u00fct\u00fc\u011f\u00fcn \u00fcretimi ve kalite kontrol\u00fc sorunlar\u0131 \u00e7\u00f6z\u00fclmelidir.<\/p>\n
Al\u00fcminyum ala\u015f\u0131m\u0131 eriyikindeki hidrojenin ana kayna\u011f\u0131, al\u00fcminyum ala\u015f\u0131m\u0131n\u0131n eritilmesi s\u0131ras\u0131nda atmosferdeki ve hammaddenin y\u00fczeyindeki nemin metalurjik reaksiyonlar yoluyla ala\u015f\u0131m eriyikine girmesi ve eriyikin hidrojen emmesine neden olmas\u0131d\u0131r. Erimi\u015f al\u00fcminyumda hidrojenin iki farkl\u0131 varolu\u015f bi\u00e7imi vard\u0131r. Hidrojenin yakla\u015f\u0131k '\u0131, ara atomlar olarak eriyik i\u00e7inde \u00e7\u00f6z\u00fcn\u00fcr. Az miktardaki hidrojenin yakla\u015f\u0131k 'u ise y\u00fczeyde veya kal\u0131nt\u0131lar\u0131n bo\u015fluklar\u0131nda kabarc\u0131klar \u015feklinde adsorbe olur ve negatif e\u011frilik yar\u0131\u00e7ap\u0131na sahip hidrojen kabarc\u0131klar\u0131 olu\u015fturur.<\/p>\n
Hidrojen varl\u0131\u011f\u0131, al\u00fcminyum ala\u015f\u0131mlar\u0131n\u0131n performans\u0131n\u0131 olumsuz etkileyecektir. Al\u00fcminyum ve ala\u015f\u0131mlar\u0131ndaki hidrojen, d\u00f6k\u00fcm k\u00fctlesinde \u00e7e\u015fitli boyutlarda g\u00f6zenekler olu\u015fturur, metal malzemenin s\u00fcreklili\u011fini bozar ve par\u00e7an\u0131n etkili kesit alan\u0131n\u0131 azalt\u0131r. G\u00f6zeneklerin \u00e7evresindeki gerilim yo\u011funla\u015fmas\u0131, d\u00f6k\u00fcm k\u00fct\u00fc\u011f\u00fcn\u00fcn i\u015flenebilirli\u011fini b\u00fcy\u00fck \u00f6l\u00e7\u00fcde azalt\u0131r; yar\u0131 mamullerde ise hidrojenin neden oldu\u011fu delaminasyon kusurlar\u0131 ve ikinci tip hidrojen gevrekle\u015fmesi g\u00f6r\u00fcl\u00fcr; bu da d\u00f6vme ve haddeleme s\u0131ras\u0131nda ala\u015f\u0131m\u0131n k\u0131r\u0131lganl\u0131\u011f\u0131n\u0131 art\u0131r\u0131r. A\u015f\u0131r\u0131 doymu\u015f ve birle\u015fik haldeki hidrojen, homojenle\u015ftirme i\u015flemi s\u0131ras\u0131nda d\u00f6k\u00fcm k\u00fctlesinde ikincil g\u00f6zeneklilik ve y\u00fczey kabarmas\u0131n\u0131n \u00f6nemli bir nedenidir.<\/p>\n
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