CETEC has extensive experience in diagnosing and investigating corrosion problems in:
- Cooling towers
- Plus a wide range of other building applications
CETEC can use ultrasonic, X-ray, magnetic and chemical methods for assessments in the field. Our CETEC corrosion expert consultants also provide independent expert witness reports regarding corrosion problems.
FORAY Laboratories Services
FORAY Laboratories is NATA accredited for Standard Test Methods for Corrosivity of Water in the absence of Heat Transfer (Weight Loss Methods).
This method covers the determination of the corrosivity of water by evaluating pitting and by measuring the weight loss of metal specimens. Pitting is a form of localised corrosion and may arise from any of the following typical corrosion mechanisms found in water systems:
- Crevice corrosion
- Under deposit corrosion
- Microbiological influenced corrosion
- Galvanic corrosion
Weight loss is a measure of the average corrosion rate (i.e. general or uniform corrosion rate). The rate of corrosion of a metal immersed in water is a function of the tendency of the metal to corrode and is also a function of the tendency for water and the materials it contains to promote (or inhibit) corrosion.
At FORAY we can:
- Assess your coupons exposed to an air or water environment to determine the general corrosion by weight loss and maximum pit depth;
- Provide comprehensive reports to you that document coupon condition as received and cleaned, general corrosion rate or maximum pit rate. Foray uses an electrolytic method to clean a coupon to ensure a contamination free specimen for analysis; and
- Foray can also complete metal corrositivity testing as described by UN Section 37 Classification Procedures, Test Methods and Criteria Relating to Substances of Class.
Images: Coupons as received on the left and coupon after cleaning on the right.
Image: Steel coupons after exposure to test fluid. The coupon on the left has been fully immersed in the liquid, the centre coupon was half immersed in the liquid, and the right coupon was only exposed to the air.