Corrosion Resistance(내식성 )
2010012243 Hwang Chang Seok2011011460 Kim Sang Hyun2011011473 Park Young Ju
What is corrosion resistance?
CORROSION?
FORM OF CORROSION
Corrosion
Uniform of gen-eral Corrosion
Galvanic Cor-rosionErosion Cor-
rosion
Crevice Cor-rosionStress Corro-
sion
Intergranular Corrosion
Pitting Corro-sionEnvironment
Corrosion
How to prevent corrosion (1/2)
To block water and oxygen : Paint, Oil, Enamel : Passive metal film (ex. Fe₃O₄, Al₂O₃)
Plating : Other metals coated on a metal surface (ex. Fe+Sn, Fe+Zn)
Fe + Sn Fe + Zn
Reactivity Fe > Sn Fe < Zn
Surface scratch Corrosion Fe Protect Fe(Corrosion Zn)
Process
How to prevent corrosion (2/2) Cathodic protection -Use reactivity of metal : By connecting the greater reactivity metals, a
structure made of metal to prevent corrosion
Alloy -Some metal alloy have corrosion resistance. (ex. Cu,Al,Mg Alloy)
FOR EXAMPLE Bronze [Cu+Sn+Ni] (Adornment)
Stainless steel [St+Cr+Ni] (Building Supplies, Automotive)
Duralumin [Al+Cu+Mg] (Airplane)
Titanium alloys (Airplane)
Nickel and Chromium alloys
ETC Platinum and Gold - Stability
Plastic - Strong chemical bonding - intentionally weakened (ex : Bbtan)
Ceramic - Metal + non-metal compounds - Strong corrosion resistance At normal temperature
Thank you.