Corrosion inhibitors for cleaning solutions
AssigneeDowell Schlumberger Incorporated
InventorWeldon C. Kennedy, Jr.
Life of this patent
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Abstract
A corrosion inhibitor composition comprising: (1) at least one of an aliphatic pyridinium salt or an aliphatic quinolinium salt; and (2) a sulfur-containing compound. The compositions are useful in inhibiting the corrosion of metals during the cleaning of process equipment using industrial aqueous cleaning solutions.
Claims22
An aqueous cleaning solution composition having a pH of from about 1 to about 10, consisting essentially of at least one organic acid, selected from the group consisting of alkylene polyamine polyacetic acid, hydroxyacetic acid, formic acid, and citric acid, or a salt thereof, and further having dissolved or dispersed therein, in at least an amount sufficient to inhibit the corrosion of metals in contact with said solution, a corrosion inhibitor composition comprising:
- (1) at least one of an aliphatic pyridinium salt or an aliphatic quinolinium salt;
- and
- (2) a sulfur-containing compound.
An inhibited aqueous cleaning solution composition having a pH of from about 1.2 to about 10 consisting essentially of:
- (1) a cleaning agent comprising at least one organic acid, selected from the group consisting of alkylene polyamine polyacetic acid, hydroacetic acid, formic acid, and citric acid, or a salt thereof and, in at least an amount sufficient to inhibit the corrosion of metals which are in contact with said solution,
- (2) a corrosion inhibitor composition comprising a sulfur-containing compound and an alkyl pyridinium salt represented by the formula:
- ##STR3## wherein R is alkyl;
- A.sup..crclbar. is an anion;
- and each R' independently is H, --OH, --OR, --OROH, halo, alkyl, alkenyl, or alkynyl.
Dependencies are inferred from the claim text.