METHODS FOR INHIBITING CORROSION IN BRAZED METAL SURFACES AND COOLANTS AND ADDITIVES FOR USE THEREIN
申请人:Yang Bo
公开号:US20100196773A1
公开(公告)日:2010-08-05
Disclosed are coolants comprising brazed metal corrosion inhibitors. In one embodiment, the disclosed brazed metal corrosion inhibitor will comprise a polycarboxylic acid functional compound having the structure:
wherein R
1
, R
2
, R
3
, and R
4
are each independently selected from the group consisting of H, OH, COOH, C
1
-C
10
alkyl groups, glycol esters, anhydride groups, —COOM, and combinations thereof, wherein M is at least one of H, alkali metal ions, alkali earth metal ions, NH4
+
, amines, imidazoline, polyalcohol esters, C1 to C12 alkyl groups, and combinations thereof; wherein (1) at least three of R
1
, R
2
, R
3
, and R
4
contain the group —COOM, wherein M is defined above; or (2) at least two of R
1
, R
2
, R
3
, and R
4
contain an anhydride group, and at least one of R
1
, R
2
, R
3
, and R
4
contain the group —COOM, wherein M is defined above.