| abstract |
>N-((R''-)NH0-1)0-2-(C(-X)(-Y)-P(=O)(-O-M)N)1- WHERE -C(-X)(-Y)-P(=O)(-O-M)2 REPRESENTS A HETEROCYCLIC RING HAVING A NITROGEN ATOM ON THE RING; R''NH0-1 REPRESENTS AN AMINO-TERMINATED SIDE CHAIN ATTACHED DIRECTLY TO THE RING NITROGEN (WHICH SIDE CHAIN MAY OR MAY NOT BE PRESENT); AND -C(-X)(-Y)-P(=O)(-O-M)2 REPRESENTS A METHYL (OR SUBSTITUTED METHYL) PHOSPHONIC ACID GROUP WHERE M IS HYDROGEN, AN ALCOHOL OR A SALT MOIETY, AND X AND Y ARE HYDROGEN OR A SUBSTITUTED GROUP SUCH AS ALKYL, ARYL, ETC., OF WHICH ONE OR TWO UNITS MAY BE PRESENT DEPENDING ON THE AVAILABLE NITROGEN BONDED HYDROGENS. PROCESS OF INHIBITING CORROSION OF METALS, MOST PARTICULARLY IRON, STEEL AND FERROUS ALLOYS, IN A CORROSIVE MEDIUM, SUCH AS, FOR EXAMPLE, A CORROSIVE OIL-CONTAINING MEDIUM, BY CONTACTING THE SURFACE OF THE METAL, PRIOR TO CONTACT WITH THE MEDIUM OR BY DISSOLUTION IN A SOLVENT AND ADDITI DIUM OR DISSOLUTION IN A SOLVENT AND ADDITION OF SAID SOLUTION TO THE MEDIUM, WITH NITROGEN-HETEROCYCLIC PHOSPHONIC ACIDS AND DERIVATIVES THEREOF CHARACTERIZED BY AMINOMETHYL (OR SUBSTITUTED METHYL) PHOSPHONIC ACIDS OR DERIVATIVES THEREOF BONDED DIRECTLY OR INDIRECTLY, I.E., THROUGH A N-SIDE CHAIN TO THE NITROGEN ATOM IN THE HETEROCYCLIC RING, FOR THE EXAMPLE THOSE CONTAINING IN THE MOLECULE AT LEAST ONE OF THE FOLLOWING UNITS: |