US 11,970,781 B2
Probe for measuring a cathodic protection condition of a buried steel structure, and backfill composition for same
Hycem Bahgat, Markham (CA); and William Daniel Fingas, Markham (CA)
Assigned to Corrosion Service Company Limited
Filed by Corrosion Service Company Limited, Markham (CA)
Filed on Feb. 10, 2021, as Appl. No. 17/172,107.
Claims priority of provisional application 62/972,145, filed on Feb. 10, 2020.
Prior Publication US 2021/0246561 A1, Aug. 12, 2021
Int. Cl. C23F 13/22 (2006.01); G01N 17/04 (2006.01)
CPC C23F 13/22 (2013.01) [G01N 17/043 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A probe for measuring a cathodic protection condition of a buried steel structure, the probe comprising:
a body;
a reference electrode accommodated in an interior of the body; and
a volume of backfill accommodated in the interior of the body and at least partially surrounding the reference electrode, the backfill comprising at least one of:
zinc sulfate (ZnSO4); and
lithium acetate,
wherein the backfill further comprises between about 0.1% and about 10% by weight of a gelling agent.