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Waste water plants

Waste water plants have different corrosion problems which may be cured by cathodic protection. Underwater engines, oxydizing equipment , scrapers, ladders and even concrete rebar suffer from pollutants in the effluent which react with carbon or stainless steel.

Anodes used fort his kind of installations are zinc anodes or MMO tubular anodes. In fact the ICCP systems for waste water plants are built as they were offshore structures. Only using high quality components like Kynar cable, MMO anodes and state-of-the-art reference electrodes may be chosen for these operations.

Potential control is a must since waste water plants have different steel qualities and the medium characterics might change by every season, for instance due to the ingress of deicing salts, hotel occupation, etc.

Concrete

During the last 100 years concrete has become the most common material for man-made structures. Steel-reinforced concrete is cheap, needs no maintenance, has a high structural strength and is mouldable and fire resistant.
Under normal circumstances, the steel reinforcement (rebar) is encased in an alkaline environment and would not suffer from corrosion. However, concrete is sometimes used in an environment where chlorides may enter the concrete and attack the rebar. Such a circumstances are car parkings, tunnels where de-icing salts may attach concrete floors and support poles. Or concrete quay walls and jetties in harbours but also bridges, concrete bassins, foundation piles etc.

Concrete rebar corrosion comes in different stages : first a change in appearance (discoloration, blemishes) occur. Later on cracks are noticed at the surface. The third stage is the disruption with major spalling of concrete.
Concrete inspections are executed by visual inspections and a hammer survey to detect hollow areas. Another interesting method are electrical potential surveys, so called mapping, which may be executed to determine the areas with the highest corrosion attacks.

One of the best long term solutions for corrosion prevention of rebar is the use of cathodic protection.

Ask Anotec’s engineering department to engineer your concrete corrosion issues. We are eager to make you a competitive offer which comply with your needs for a long term corrosion protection.