ADDITIVI PER INIBIRE LA CORROSIONE DELL'ACCIAIO NEL CALCESTRUZZO

• Main Authors: BURY MARK A, FARRINGTON STEPHEN A, BOBROWSKI GREGORY S, NMAI CHARLES K
• Format: Patent
• Language: Italian
• Published: 12.06.1993
• Edition: 5
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LIME, MAGNESIA; METALLURGY; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

Additive comprises an oil-in-water emulsion contg.: (a) in the oil phase, (i) 10-55% of an unsatd. fatty acid ester, (ii) 1-15% of an ethoxylated 6-12 alkylphenol and (iii) 1-5% of an ester of an aliphatic carboxylic acid and a monool, diol or triol; and (b) in the water phase, (iv) 0.1-5% of a satd. 12-30C fatty acid, (v) 0.1-1% of an amphoteric cpd. with at least 1 amino gp. and at least 1 acid gp., (vi) 2-10% of a glycol and (vii) 0.1-2% of a soap. Pref. compsn. includes (a)(i) 10-55% (15-30%) of a 4-15C alkyl or alkylene glycol oleate, (ii) 3-15% (5-10%) of an ethoxylated nonylphenol with 2-4 EO and (iii) 2-5% of an ester with a total of 8-46C. The amphoteric cpd. (b) (v) is a coco alkyl-beta-aminopropionic acid. The emulsion contains 0.6-4% of a satd. fatty acid and of a soap. The oil phase forms 15-65 (20-35) wt.% of the emulsion, and the water content of the emulsion is 20-80 (50-75) wt.%. USE/ADVANTAGE - Steel reinforcement in concrete is protected against corrosion by addn. of the additive to the concrete mixt. before casting. A concrete mixt. contg. the additive is suitable for steel reinforcement. The steel is protected against corrosion by chlorides, e.g. by penetration of deicing chemicals or seawater into the concrete. The additive compsn. is stable under normal temp. variations