Tetracarboxylic acid combinations for corrosion inhibition
申请人:ECOLAB USA, INC.
公开号:US11149202B1
公开(公告)日:2021-10-19
Corrosion inhibitors and methods for reducing or inhibiting corrosion of metals in aqueous systems are provided. Corrosion inhibitor compositions may include tetracarboxylic acids, such as butane tetracarboxylic acid. The compositions may include other components, such as zinc, molybdate, silicate, cerium, among others. The compositions may also include polymers or oligomers. The corrosion inhibitor compositions produced synergistic results and unexpectedly low corrosion rates.
The invention relates a compound represented by the formula (1):
Q
1
-Q
2
-C(═O)—N(R
1
)-Q
3
-N(R
2
)-T
1
-Q
4
(
1
)
wherein R
1
and R
2
represent H or the like; Q
1
represents an aromatic ring, heterocyclic ring or the like; Q
2
represents a single bond, aromatic ring, heterocyclic ring or the like; Q
3
represents a group
1
or the like, Q
4
represents an aromatic ring, heterocyclic ring or the like; and T
1
represents —CO— or —SO
2
—, and a medicine which comprises the compound and is useful for thrombosis and embolism.