SEDL / STP / STP1000-EB / STP39187S

Erosion-Corrosion Measuring Devices

Schorr, M
Head, corrosion engineer, and senior technician, IMI (TAMI)—Institute for Research and Development Ltd., Haifa,

Weintraub, E
Head, corrosion engineer, and senior technician, IMI (TAMI)—Institute for Research and Development Ltd., Haifa,

Andrasi, D
Head, corrosion engineer, and senior technician, IMI (TAMI)—Institute for Research and Development Ltd., Haifa,

Pages: 9    Published: Jan 1990

Download this paper for $25 PDF (160K)          View License Agreement
Abstract

Two instruments for the study and measurement of erosion-corrosion (EC) were developed and built: the erosion-corrosion unit (ECU) and the erosion-corrosion tester (ECT). These instruments simulate the shear and impact forces acting on industrial equipment to evaluate the corrosive wear effects of the fluid on the equipment and their interaction. The specimen in the ECU consists of a cylinder rotated about a vertical axis while a jet of slurry impinges continuously onto its curved surface through an interchangeable nozzle. The ECT applies rotational sliding abrasion by the slurry on a static disk specimen. In both devices, a three-electrode system (working, reference, and counter electrodes) is used to evaluate the electrochemical corrosion component by the polarization resistance technique. The contribution of mechanical erosion to the synergetic EC process is measured by weight loss on long-term exposures.

The instruments were applied as follows: in industrial plants to monitor the influence of corrosion parameters during production, in pilot plants and in the laboratory to evaluate and select corrosion-resistant alloys, to assess the corrosivity of the ores and slurries handled, and for analysis of EC failures.

The instruments are described and their characteristics compared. The results obtained in several environments are presented and their significance discussed.