Caltech engineering services manufacture, supply corrosion coupons. The other range of corrosion coupons test that accurately determine the corrosion of metals in various service conditions. Strip type corrosion coupons are produced in number of sizes, shapes, and material as per customer needs. Corrosion coupons meet nace standard requirements and tested before shipment. Corrosion coupons are supplied in vci bags for excellent storage of ferrous and non- ferrous coupons. Vci bags supplied generally protect material up to 1 year under proper environment conditions.
Each coupon is pre-weight before shipment, ensure once again before exposure and during pre-exposure. Corrosion coupons are highly used to monitor corrosion rates in any environment, which is critical when viewed in terms of the maintenance and repair costs associated with corrosion and material failure. Test coupons are comparatively low cost and effective to measure loss in weight in terms of mils/year to estimate corrosion, important information regarding material life expectancy.
Coupons can be stenciled with alloy and sequence numbers for proper identification. Mill test reports, identifying element compositions of materials used, are provided on all orders. The simplest, and longest-established, method of estimating corrosion losses in plant and equipment is weight loss analysis. A weighed sample [coupon] of the metal or alloy under consideration is introduced into the process, and later removed after a reasonable time interval.
The technique requires no complex equipment or procedures, merely an appropriately shaped coupon, a carrier for the coupon [coupon holder], and a reliable means of removing corrosion product without disruption of the metal substrate. Weight loss measurement is still the most widely used means of determining corrosion loss, despite being the oldest method currently in use. The method is commonly used as a calibration standard for other means of corrosion monitoring, such as linear polarization and electrical resistance. In instances where slow response and averaged data are acceptable, weight loss monitoring is the preferred technique
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