CORROSION MITIGATION IN BALCONY REPAIRS What is ...

More documents

Recommendations

Info

BASIC TERMINOLOGY RELATIVE HUMIDITY Corrosion Currents, uA 600 UNTREATED 500 400 300 200 100 0 45 50 55 60 65 70 75 80 85 90 95 100 95 90 85 80 75 Wetting Cycle % Relative Humidity Drying Cycle 04.11.2004 11 BASIC TERMINOLOGY • DISSILIMAR METALS – two metal components in an electrolyte that could form an anode-cathode relationship when connected by a metallic path Gold 316 SS Steel • ELECTROMOTIVE SERIES - list of metals whose order indicates the relative tendency to be oxidized, or to give up electrons Chromium Zinc Aluminum
CORROSION: What Do You Need? • Steel (Fe++) • Chlorides (Cl-) • Oxygen (O 2 ) • Water (H 2 O) or another metal • OTHER Symbols to know • Electrons (e-) like a battery corrosion has an electrical current • Hydroxyl (OH-) basic / alkali available in concrete solution • Hydrogen (H+) acid – causes the pH to lower Electrochemical Corrosion Reactions •Fe ++ + 2Cl - FeCl 2 •FeCl 2 + H 2 O + OH - Fe(OH) 2 + H + + 2Cl - •2Fe(OH) 2 + ½O 2 - Fe 2 O 3 + 2H 2 O anode •½O 2 + H 2 O + 2e - 2 OH - cathode 04.11.2004 14
Page 1 and 2: CORROSION MITIGATION IN BALCONY REP
Page 3 and 4: DISSIMILAR METALS BASIC TERMINOLGY
Page 5: BASIC TERMINOLOGY • ANODE: Electr
Page 9 and 10: CORROSION CONTROL OPTIONS Restorati
Page 11 and 12: 04.11.2004 21 GALVANIC PROTECTION Z
Page 13 and 14: PERIMETER REPAIRS REPAIR MORTARS wi
Page 15 and 16: GALVANIC PROTECTION Anodes Need Con
Page 17 and 18: Corrosion Inhibitors • Inorganic
Page 19 and 20: SURFACE APPLIED CORROSION INHIBITOR
Page 21 and 22: BUT WAIT….. • WHAT ABOUT CRACKS
Page 23: THANK YOU! THANK YOU. BASF Construc

CORROSION MITIGATION IN BALCONY REPAIRS What is ...

Create successful ePaper yourself

Delete template?

Save as template?