Why doesn't aluminum rust?
Din il-mistoqsija hija żbaljata. L-aluminju wkoll sadid, iżda l-aluminju ma jissadidx bħall-ħadid sakemm ikun sadid. Il-metall huwa ossidizzat mill-ossiġnu fl-arja, li huwa sadid. L-aluminju jirreaġixxi ma 'l-ossiġnu biex jifforma ossidu ta' l-aluminju, li huwa sadid ta 'l-aluminju. Is-sadid tal-aluminju huwa rqiq ħafna, il-ħxuna tiegħu hija biss għaxar elf ta 'millimetru, iżda hija iebsa ħafna u reżistenti ħafna għall-ilbies-. Huwa jeħel mal-wiċċ ta 'l-aluminju, sabiex l-aluminju ġewwa ma jkunx jista' jilħaq l-arja ta 'barra, u jipprevjeni li l-aluminju jkompli jissadid.
Tips: Alumina film also has a "nemesis": one is alkali and the other is acid. Alumina encounters them and chemically reacts, forming compounds, which are very easy to fall off. Dishes often contain acid and alkali ingredients, so no! want! Put the fruit wine of the dishes in aluminum utensils to avoid corrosion and damage to the aluminum pan. Besides, no! want! Because the surface of the aluminum pan is gray and embarrassing, use sand to wipe it off. Although you wipe a layer of oxide film, the aluminum pan will be brighter, but this can only make you happy for a while. If the protective film on the surface is lost, the aluminum pan will continue to oxidize, and the gray color of the aluminum oxide will still show up in front of your eyes; and the aluminum pan is getting thinner and thinner, affecting its service life.
2. Għaliex l-aluminju huwa metall mhux-tal-ħadid?
Metalli mhux-tal-ħadid fis-sens dejjaq jissejħu wkoll metalli mhux-ferrużi, li huma t-terminu ġenerali għall-metalli kollha ħlief ħadid, manganiż, u kromju; metalli mhux tal-ħadid f'sens wiesa' jinkludu wkoll ligi mhux tal-ħadid (b'metall mhux-tal-ħadid bħala l-matriċi (ġeneralment akbar minn 50 fil-mija )), li żżid wieħed jew An liga komposta minn diversi elementi oħra).
3. Għaliex l-aluminju huwa metall li jtir?
The density of aluminum is small, only 2.7g/cm3, and there is a dense Al₂O₃ film on the surface, which prevents the internal aluminum from reacting and is not easily oxidized. It is a commonly used material for airplanes. 70 percent of modern airplanes are made of aluminum and aluminum alloys, so they are called flying metals.
4. Għaliex l-aluminju huwa trivalenti?
Fi kliem sempliċi, l-arranġament ta 'l-elettroni barra l-atomu ta' l-aluminju huwa 2, 8, 3. In-numru ta 'elettroni fis-saff ta' barra mhuwiex sodisfatt, l-istruttura hija instabbli, u 3 elettroni huma faċli biex jitilfu, għalhekk ħafna drabi juri trivalenti pożittiv. Madankollu, ovvjament it-3 elettroni huma aktar stabbli mill-elettron wieħed fis-saff l-aktar 'il barra ta' Na u ż-żewġ elettroni fis-saff l-aktar 'il barra tal-manjeżju, għalhekk l-Aluminju huwa inqas attiv mis-sodju u l-manjeżju.
5. Għaliex il-profili tal-aluminju ġeneralment jeħtieġu li jiġu ttrattati fil-wiċċ?
Jekk il-profil ta 'l-aluminju ma jkunx ittrattat bil-wiċċ, id-dehra mhix sabiħa, u huwa faċli li tkun imsadda fl-arja umda, għalhekk huwa diffiċli li tissodisfa r-rekwiżiti dekorattivi għolja u tar-reżistenza għat-temp tal-profil ta' l-aluminju fil-materjali tal-bini, sabiex biex ittejjeb l-effett dekorattiv u tittejjeb ir-reżistenza għall-korrużjoni U biex tiġi estiża l-ħajja tas-servizz, il-profili tal-aluminju ġeneralment iridu jiġu ttrattati bil-wiċċ.
6. Għaliex l-aluminju jiswa aktar mill-ħadid?
Although the reserves of aluminum in the earth's crust are more than iron, the production process of aluminum is more complicated than that of iron. Aluminum is a relatively active metal element. The smelting requires electrolysis, and the cost of the entire production process is higher than that of iron. , So the price of aluminum is higher than that of iron.
