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͹ͧԵШѹ ʹ (ʹ͡䫴ͧ Fe2O3.xH2O) Դҡ˵С ҧ еͧ١͡ǡѺ͡ҡԴ͡䫴ͧ ʹ(Fe2O3) ʹͧᴧ (CuO) ʹ (Al2O3) ԴʹкǹѺ͹ҡѡɳѧ
1. ͹ͧ ԡԴҧСѺǴ
2. Ǵ͹ ͡ਹ(H2O, O2) H2O Ѻҡ
3. ԡԴ͹ ԡմ͡
3.1 Դԡ Oxidation (硵͹)
3.2 ǴѺ硵͹ Դԡ Reduction
4. ʴԡ͹ ҡͧ)
+ Ǵ -----> Ion ͧ +
Fe (s) + H2O (l) + O2 (g) -----> Fe2+ (aq) + OH- (aq)

Fe2+ ͺ K3Fe(CN)6 Թ Թ ʴ Fe2+ ҡ ҧ Fe2+
(OH-) ͺ¿Թ쿷չ

5. Balance
ʡѺҡ еͧԴԡ͡പѹѧ
Fe (s) ------> Fe2+ (aq) + 2e .(1) (Oxidation)
͡ਹѺ硵͹ҡ ѧ
2H2O (l) + O2 (g) + 4e ------> 4OH- (aq) .(2) (Reduction)
(1) * 2 + (2) ; 2Fe + 2H2O + O2 -------> 2Fe2+ + 4OH- (Redox)

ͧѹʹ
1. ѹ ͺʵԡ ͧѹ١Ѻ O2 ͧѹԴʹͧԸдǡͧѹʹ
2. ҧԴѵ ԡҡѺ͡Դ͡䫴ͧͺͧйԴ͹ա ѵѧ պء ѧ غ ͺ Oxide ͧ ҡ ҧ ա Cr () (Al) ѧ Cr2O3.Al2O3 ҡ ¡Ը 䴫 (Anodize)
˵ Դʹ (stainless steel) Fe Cr
3. ͹ͧԡԴǡѺ⹴ŵ ѧͧԴ͹֧ͧѺ e- ¡Ѻ Fe غ Zn Ѻاѧ ѧا Mg ١ Mg ç Fe ŧ ͧҡ Zn & Mg e ¡ Fe e ᷹ Fe ¡Ը ԡ (Cathodic)
4. ͧѹ͹ͧкԴ
ͧ¹ö¹ͧԵкԴѡسͧͧ¹٧ҡԹ ͡ਹ ͧ¹ ͡ਹ١ҧ͡䫴 ͧѹ͹ͧ¹ ͧ¹ǹСͺͧ ǹСͺͧͧ¹ʡѺԴ͹ ͧҡ͡䫴ͧѵͺ ֧ͧѺѴ͹СͺСͺͧõá к pH ٧ 8.5 ˷ǹСͺͧͧ¹Դԡ͡പѹҡ ͹֧ͧŴŧ ͡ҡкԴաС˹ӡѴҳͧ͡ŧ֧͹ͧŴŧ