Sealing composition having corrosion inhibitor therein
View Patent ↗A composition for sealing at least one fluid leak in heat exchange systems comprises at least one solvent, and fibrillated fiber in an amount and of a size sufficient to become entrained in and seal the one leak. At least one corrosion inhibitor is present in an amount sufficient to aid in prevention of corrosion of at least two metals. The corrosion inhibitor is compatible with coolants having organic acid corrosion inhibiting agents therein, and with coolants having silicate corrosion inhibiting agents therein.
1. A composition for sealing at least one fluid leak in heat exchange systems, the composition having a pH within a range of between about 8 and about 9, comprising:
at least one solvent;
fibrillated fiber in an amount and of a size sufficient to become entrained in and seal the at least one leak; and
at least one corrosion inhibitor in an amount sufficient to aid in prevention of corrosion of at least two metals, wherein the at least one corrosion inhibitor is compatible with coolants having organic acid corrosion inhibiting agents therein and with coolants having silicate corrosion inhibiting agents therein, and is therefore selected from the group consisting of alkali metal nitrates, azoles, modified azoles and mixtures thereof.
2. The composition as defined in claim 1 , further comprising particulate material in an amount and of a size sufficient to coact with the fibrillated fiber to seal the at least one leak.
3. The composition as defined in claim 1 wherein the composition has a pH of about 9.0.
4. The composition as defined in claim 1 wherein a main component of the coolant having organic acid corrosion inhibiting agents therein and the coolant having silicate corrosion inhibiting agents therein is glycols.
5. The composition as defined in claim 4 wherein the main component of the coolant having organic acid corrosion inhibiting agents therein and the coolant having silicate corrosion inhibiting agents therein is selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, glycerol, and mixtures thereof.
6. The composition as defined in claim 1 wherein the at least one corrosion inhibitor is a mixture of sodium nitrate and modified azoles.
7. The composition as defined in claim 1 wherein the fibrillated fiber comprises poly-paraphenylene terephthalamide pulp.
8. The composition as defined in claim 1 , further comprising at least one mineral-based material present in an amount sufficient to aid in sealing the at least one leak, wherein the mineral-based material is a clay or clay analog selected from the group consisting of bentonite, smectite, montmorillonite, paligorskite, attapulgite, sepiolite, saponite, kaolinite, halloysite, hectorite, beidellite, stevensite, fire clay, ground shale, mud, silt, and mixtures thereof.
9. The composition as defined in claim 1 , further comprising a thickening agent.
10. The composition as defined in claim 1 wherein the solvent is water.