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Does 2 pieces of metals combine automatically after long time contact because of atom vibration and collision and finally form metallic bonds between the contact surface?

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    $\begingroup$ Well, they kinda can, but the surface must be really exceptionally clean. $\endgroup$ – Ivan Neretin Dec 11 '15 at 6:13
  • $\begingroup$ See, this has been answered before: physics.stackexchange.com/questions/87107/… $\endgroup$ – Ivan Neretin Dec 11 '15 at 9:53
  • $\begingroup$ Interestingly, in space if two metals make contact, they will automatically combine to form one metal $\endgroup$ – user22450 Dec 12 '15 at 20:59
  • $\begingroup$ Gold will bond to gold in a short time, and only a bit longer is needed when in contact with silver or copper. Indium also can bond quickly. BTW, I've had mercury wet a gold ring, leaving a silver-colored stain, that disappeared in a few days as the mercury flowed deeper into the ring. $\endgroup$ – DrMoishe Pippik Dec 13 '15 at 2:25

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