04/11/2024
π The Hidden Threat to Steel β Corrosion Below the Surface
When we think about corrosion in construction, we often imagine steel exposed to the atmosphere. But according to Peter Golding, CEO of GAA, itβs the unseen portions of steel buried underground that are at an even greater risk.
Soil composition plays a pivotal role in how fast steel corrodes, with factors like soil resistivity, moisture, pH, and bacterial presence accelerating the process. This complexity is heightened across Australia and New Zealand, where soil properties vary widely by region.
Galvanizing as a Shield: Hot dip galvanized coatings provide crucial protection by corroding at a much slower rate than steel. As GAA's David Harrison explains, these coatings delay the onset of steel corrosion, and even then, zinc corrosion products help mitigate further damage.
Site-Specific Protection: To safeguard buried steel, engineers should consider protective barriers, especially at the soil-air interface, where fluctuating oxygen and moisture levels are most corrosive. From epoxy coatings to select backfill techniques, each solution must be customized to the siteβs unique environment.
For durable, long-lasting infrastructure, consider the full lifecycle of materials and the conditions theyβll face underground. π Read more in GAAβs latest advisory note on embedded galvanized steel and enhance the resilience of your projects!
https://createdigital.org.au/mitigating-corrosive-power-soil-steel/