US 6,982,062 B2
Corrosion inhibiting composition
Frank L. M. DeCordt, Ranst (Belgium); Niklas Dahlberg, Torslanda (Sweden); Joseph Mihelic, Sparta, N.J. (US); and Michelle Blackowski, Paterson, N.J. (US)
Assigned to Ashland Inc., Dublin, Ohio (US)
Filed on Jul. 22, 2003, as Appl. No. 10/624,444.
Prior Publication US 2005/0017220 A1, Jan. 27, 2005
Int. Cl. C23F 11/02 (2006.01); C23F 11/12 (2006.01); C23F 11/14 (2006.01); C09K 15/06 (2006.01); C09K 15/18 (2006.01); C09K 15/20 (2006.01)
U.S. Cl. 422—16 7 Claims
 
1. A process for inhibiting the vapor phase corrosion of drained metal equipment that contains one or more recesses where water can reside which comprises:
adding an effective corrosion inhibiting amount of a corrosion inhibitor composition comprising:
(a) an aliphatic amine or an aliphatic alkanolamine,
(b) an azole selected from the group consisting of (1) tolyltriazole, (2) benzotriazole, and (3) mixtures thereof, and
(c) a benzoate,
to said drained equipment, such that the weight ratio of aliphatic amine or aliphatic alkanolamine to azole in the composition is from 50:1 to 30:1 and the weight ratio of benzoate to azole in the composition is from 40:1 to 150:1, and such that the corrosion inhibiting composition contains less than 1.0 part of an inorganic salt per hundred parts of corrosion inhibiting composition.