{"id":23003,"date":"2012-01-30T14:53:00","date_gmt":"2012-01-30T14:53:00","guid":{"rendered":""},"modified":"2020-09-25T09:26:32","modified_gmt":"2020-09-25T09:26:32","slug":"aluminiul-2","status":"publish","type":"post","link":"https:\/\/rubyskynews.com\/index.php\/2012\/01\/30\/aluminiul-2\/","title":{"rendered":"Aluminiul"},"content":{"rendered":"
<\/div>

Aluminiul,cel mai abundent metal din scoarat Pamantului, a fost obtinut \u00eentaia data de catre HUMPHRY DAVY.
\nAluminiul este un metal foarte electropozitiv si reactiv cu greutatea atomica 26,974 ;
\nare o structura cristalina cubica,cu fetele centrate, ceea ce \u00eel face maleabil si ductil, adica
\npoate fi laminat \u00een foi subtiri si tras \u00een fire fine.
\nCaracteristicile AL. metalic depind si starea de puritate.Astfel, pentru AL. pur de 99,99%
\npunctul de topire este de 660,2\uf0b0C, iar greutatea specifica de 2,699 g\/cm3,\u00een timp ce
\npentru AL. Tehnic de 99,5% , valorile respective sunt 658,4+C si 2,705 g\/cm3.
\nDiferenta mare \u00eentre temperatura de topire (660\uf0b0C) si cea de fierbere (2270\uf0b0C), perfecta
\nstabilitate a metalului \u00een stare topita sunt calitati care permit ca turnare lui \u00een forme sa se faca usor si \u00een bune conditii.
\nAluminiul este un metal amfoter, care se poate ioniza \u00een apa fie bazic, fie acid dupa PH.
\nrespectiv.Sa luam exemplul hidroxidului de AL :
\nAL(OH)3 + OH \uf0ae AL(OH)4
\nAL(OH)3 + 3H+ \uf0ae AL3+ + 3H20
\nAluminiul are o mare capacitate de reactie.Rezistentaaluminiului si a aliajelor sale la co-
\nroziune depinde de comportarea pelicului fine de oxid de aluminiu care acopera metalul.
\nPrin tratament anodic se obtine un strat uniform, care poate absorbi coloranti organici
\npentru a capata orice nuanta si care \u00een acelasi timp creste rezistenta sa la coroziune.
\nPrin observatii repetate s-a demonstrat ca \u00eentr-o atmosfera umeda si coroziva trebuie ferit aluminiul de contactul cu metalele electropozitive, spre a evita atacarea si corodarea lui.
\nIn practica, trebuie ocolit \u00een special contactul cu cuprul; \u00een schimb contactul cu zincul apara alumuniul de atac.<\/p>\n

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Aluminiul,cel mai abundent metal din scoarat Pamantului, a fost obtinut \u00eentaia data de catre HUMPHRY DAVY. Aluminiul este un metal foarte electropozitiv si reactiv cu greutatea atomica 26,974 ; are o structura cristalina cubica,cu fetele centrate, ceea ce \u00eel face maleabil si ductil, adica poate fi laminat \u00een foi subtiri si tras \u00een fire fine. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"aioseo_notices":[],"yoast_head":"\nAluminiul - Jobs\/ Internships\/ Scholarships\/<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rubyskynews.com\/index.php\/2012\/01\/30\/aluminiul-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aluminiul - Jobs\/ Internships\/ Scholarships\/\" \/>\n<meta property=\"og:description\" content=\"Aluminiul,cel mai abundent metal din scoarat Pamantului, a fost obtinut \u00eentaia data de catre HUMPHRY DAVY. Aluminiul este un metal foarte electropozitiv si reactiv cu greutatea atomica 26,974 ; are o structura cristalina cubica,cu fetele centrate, ceea ce \u00eel face maleabil si ductil, adica poate fi laminat \u00een foi subtiri si tras \u00een fire fine. 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