FORAY is 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 as may arise from crevice corrosion, under deposit corrosion, microbiological influenced corrosion or galvanic corrosion, which are typical corrosion mechanisms found in water systems.

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:

• Supply your corrosion coupons as mild steel or copper;

• Assess your coupons exposed to an air or water environment to determine the general corrosion by weight loss and maximum pit depth; and

• 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.

    
         Coupon as received                                               Coupon after cleaning

FORAY can also complete metal corrosivity testing as described by UN Section 37 Classification Procedures, Test Methods and Criteria Relating to Substances of Class 8.

Steel coupons after exposure to test fluid. Left-hand side is fully liquid immersed coupon, centre is half liquid and half air exposure and right hand side is fully air exposed.

Return to FORAY Laboratories