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Corrosion Resistance ( 내식성 ). 2010012243 Hwang Chang Seok 2011011460 Kim Sang Hyun 2011011473 Park Young Ju. What is corrosion resistance?. CORROSION?. FORM OF CORROSION. Uniform of general Corrosion. Crevice Corrosion. Stress Corrosion. Galvanic Corrosion. Erosion Corrosion. - PowerPoint PPT Presentation
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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.