Kɔbere wɔ ahoɔden a ɛko tia nsɛeɛ a ɛkyɛn so wɔ mmeaeɛ a ɛhɔ yɛ kusuu, nanso ɛtaa yɛ patina wɔ mmeaeɛ a nsuo a ɛyɛ nwini anaa sulfur-wɔ mu, na ɛma ahoɔden a ɛko tia nkitahodiɛ no kɔ soro. Aluminium ani taa yɛ oxide film a ɛyɛ den, na ɛno mmom betumi asiw nsɛe bio ano. Nanso, oxide film no ahoɔden a ɛko tia (bɛyɛ 10−6Ω·cm2) no korɔn koraa sen kɔbere substrate (10−6Ω·cm2), na ɛsɛ sɛ wɔma ɛyɛ yiye denam tin plating, nickel plating anaa anodic oxidation treatment so.
Sɛ yɛhwɛ nkɛntɛnso a ɔhyew nya wɔ anyinam ahoɔden so a, ɔhyew a ɛwɔ kɔbere a ɛko tia (0.0043/℃) no sua sen aluminium de (0.0041/℃), nanso sɛnea aluminium trɛw wɔ ɔhyew mu (23.6×10−6/℃) yɛ kɔbere de mmɔho 1.4 (16.5×1066/℃) ). Wɔ tebea horow a ɔhyew mu nsakrae kɛse wom mu no, ɔhyew a ɛtrɛw ne nea ɛtwetwe a ɛwɔ aluminium nnua mu no da adi kɛse, na ebetumi ama ayɛ mmerɛw wɔ mmeae a ɛka bom no. Wobetumi atew eyi so denam adansi nhyehyɛe (te sɛ ntrɛwmu kwan a wɔde sie) anaasɛ denam nkitahodi ahorow a ɛyɛ mmerɛw a wɔde bedi dwuma so.