Polyurea coatings provide long-term anti-corrosion protection for power plant chimneys, and SANTAM's follow-up inspection confirms their superior performance.

In the field of energy production, power plant chimneys are continuously exposed to high temperatures, high humidity, and corrosive flue gases, which present considerable challenges to structural integrity and service longevity. CHENGDU SANTAM TECH. has recently completed a five-year follow-up assessment on the application of polyurea coatings in chimney anti-corrosion projects, achieving outstanding results.

Polyurea coatings are a new class of high-performance anti-corrosion materials formed through the chemical reaction between isocyanates and amine compounds, resulting in a durable elastomeric structure. These coatings demonstrate excellent chemical resistance, effectively withstanding the effects of acidic and alkaline components present in flue gases. Their rapid curing properties, with surface drying times ranging from 5 to 30 seconds and full operational readiness achieved within one hour, significantly shorten construction cycles. Moreover, their high elasticity and impact resistance are particularly notable, with elongation at break ranging from 300% to 500%, enabling the coatings to accommodate thermal expansion and contraction of chimneys and thereby prevent cracking.

During the follow-up assessment, the SANTAM’s team conducted a comprehensive inspection of the polyurea coating on the chimney’s inner wall using specialized equipment. The results indicated that, despite five years of exposure to severe operating conditions, the coating surface remained smooth and intact, showing no signs of wear, cracking, or delamination, and maintaining strong adhesion to the substrate. All measured performance indicators surpassed design specifications, conclusively demonstrating the long-term effectiveness and reliability of polyurea coatings in anti-corrosion applications for chimneys.

In the construction phase, SANTAM strictly followed standardized procedures. The inner wall of the chimney was thoroughly cleaned using high-pressure water jet technology to ensure optimal surface preparation for coating adhesion. Specialized spraying equipment was used to precisely control process parameters, ensuring the formation of a continuous and seamless coating layer.

From an economic standpoint, although the initial cost of polyurea coatings is relatively high, their extended service life, minimal maintenance requirements, and the operational benefits derived from reduced power generation downtime collectively contribute to lower overall lifecycle costs. Over the five-year period, the chimney required only routine inspections, resulting in significant savings in both time and maintenance expenses, and ensuring continuous power generation.

This long-term follow-up not only provides empirical validation for the use of polyurea coatings in chimney anti-corrosion applications but also highlights the technical expertise and professionalism of SANTAM. As industrial demands for infrastructure durability and environmental compliance continue to grow, polyurea coatings are expected to play an increasingly important role across a broader spectrum of anti-corrosion engineering applications.