https://padlet.com/lmk64581/3p8vdrdk4ntu Ch13 corrosion of metals en-us 2019-02-17 13:13:46 UTC 2024-12-16 18:01:13 UTC hello@padlet.com lmk64581 https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332105268 2019-02-17 13:32:21 UTC https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332105268 lmk64581 https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332106068 The deterioration of a metal due to its reaction with oxygen, moisture or other substances environment is called corrosion .]]> 2019-02-17 13:40:46 UTC https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332106068 lmk64581 https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332106770 The corrosion of iron is called rusting. Rust is the reddish-brown crust that forms on the substances the iron.]]> 2019-02-17 13:48:01 UTC https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332106770 lmk64581 https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332107330 For rusting to occur, two things must be present: air (oxygen) and water]]> 2019-02-17 13:54:14 UTC https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332107330 lmk64581 https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332107807 a) presence of ionic substances
b) presence of acidic pollutants
c) higher temperature
d) scratching or bending the surface
e) attachment to a less reactive metal.]]> 2019-02-17 13:58:38 UTC https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332107807 lmk64581 https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332108946 Rusting can be observed using a rust indicator, a mixture of potassium hexacyanoferrate and phenolphthalein.]]> 2019-02-17 14:10:14 UTC https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332108946 lmk64581 https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332109503 A) coating with paint, oil, grease or plastic.
B) tin-plating.
C) zinc-plating.
D) electroplating.
E) using sacrificial metals.
F) impressed current cathodic protection.
G) using corrosion resisting alloys of iron.]]> 2019-02-17 14:15:49 UTC https://padlet.com/lmk64581/3p8vdrdk4ntu/wish/332109503