THE USE OF CORROSION INHIBITORS FOR THE PROTECTION OF CONCRETE REINFORCEMENT / IN ITALIAN/

A STUDY IS DESCRIBED ON THE ELECTRO-CHEMICAL EFFECTS OF 2 STEEL CORROSION INHIBITORS: POTASSIUM CHROMATE AND SODIUM NITRITE. TESTS WERE CARRIED OUT ON MORTAR PREPARED WITH THREE-TYPES OF CEMENT: PORTLAND CEMENT, BLAST-FURNACE CEMENT, AND POZZOLANIC CEMENT, SOME WITH AND SOME WITHOUT CALCIUM CHLORIDE. DURING MOULDING, A STEEL BAR WAS INSERTED IN EACH CYLINDICAL SAMPLE. AFTER 48 HOURS THE SAMPLES WERE IMMERSED IN A CALCIUM HYDROXIDE SOLUTION IN WHICH GRAPHITE ELECTRODES WERE ALSO PLACED. A CURRENT OF INCREASING CONCRENTRATION WAS APPLIED TO THE STEEL BAR AND GRAPHITE CATHODES, AND ANODIC POLARIZATION CURVES WERE DRAWN. THOSE CURVES SHOW THAT FOR PORTLAND AND POZZOLANIC CEMENT THE TWO INHIBITORS COMPLETELY NEUTRALIZE THE DEPASSIVATING EFFECT OF CALCIUM CHLORIDE. WITH REGARD TO BLAST FURNACE CEMENT, THE NEUTRALIZATION IS LESS COMPLETE FOR 2 PER CENT OF CALCIUM CHLORIDE BUT BECOMES COMPLETE WHEN THE PROPORTION BECOMES 1 PER CENT OF CALCIUM CHLORIDE. THIS SUGGESTS THAT THERE EXISTS A COMPETITIVE EFFECT BETWEEN THE INFLUENCE OF THE INHIBITOR AND THAT OF THE ADMIXTURE /LCPC/RRL/

• Supplemental Notes:
  • No 2, pp 67-72, 2 FIG, 1 TAB, 3 PHOT, 12 REF
• Corporate Authors:

  Industria Italiana Cemento

  ,    
• Authors:
  • Amicarelli, V
• Publication Date: 1968

Subject/Index Terms

• TRT Terms: Blast furnaces; Calcium chloride; Corrosion; Electrochemistry; Inhibitors (Chemistry); Material reinforcement; Nitrites; Portland cement; Pozzolan; Protection; Reinforced concrete; Sodium inorganic compounds; Steel
• Old TRIS Terms: Potassium chromate; Sodium nitrite
• Subject Areas: Geotechnology; Highways; Materials; Security and Emergencies;

Filing Info

• Accession Number: 00216524
• Record Type: Publication
• Source Agency: Road Research Laboratory /UK
• Files: TRIS
• Created Date: Oct 13 1970 12:00AM