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acts as a corrosion catalyst!

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(1)
(2)

Fe2+

O2

H2O OH- O2 H2O

OH-

Fe2+

Cl-

Fe2+

Cl- Fe2+

[Anode Reaction]

e- e-

Cl

-

acts as a corrosion catalyst!

Fe Fe2+ + 2e-

[Cathode Reaction]

O2 + H2O + 4e- 4OH-

Anode Cathode

Cathode

(3)

대기부해상

(Splash Zone)비말대

(Tidal Zone)간만대

해수중부

Cl-

Cl- Cl- Cl-

Cl- Cl- Cl- Cl-

O2

O2

O2 O2

O2 O2

O2

O2 H2O

H2O H2O H2O Cl-

Cl- Cl-

H2O

Cl-

 염소이온 부족

 Slow corrosion

 수분 증발로 인한 염소이온 축적

 용존산소 풍부

 Very fast corrosion

 용존산소 다소 부족

 Relatively slow corrosion

 용존산소 절대 부족

 Very slow corrosion

염해 (철근 부식) 조건 : 염소이온 (Cl-), 산소 (O2), 물 (H2

O)

(4)

NO2-

OH-

OH- NO2-

Fe2O3 Passive Film

Cl- Cl-

Nitrate-based

corrosion inhibitor

Fe2O3

Passive Film Fe2+ Fe2+

NO2-

OH-

OH-

NO2-

OH-

OH-

OH-

(5)

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