Exxonmobil Research and Engineering Company

Cheayao Zhang

Mohsen Shahmirzadi Yeganeh

Saul Charles Blum

Shawn Michael Dougal

Guido Sartori

Glen Barry Brons

David Craig Dalrymple

H Alan Wolf

Liza Marie Monette

The corrosion rate of a metal immersed in a fluid medium is measured by transmission of a beam of radiation normally in the visible or near infra-red portion of the spectrum, through a thin film of the metal immersed in the medium. The film of the metal is suitably supported on a radiation-transmitting substrate such as a glass plate or slide. The corrosion rate can be determined by passing a radiation beam through the metal film sample using a twin beam system to compensate for instrument factors such as the absorbance by the fluid medium, the cell windows and the film-supporting substrate. As the thickness of the film decreases, the reduction in film thickness is determined by the increase in beam intensity, using a reference beam to compensate for the instrument factors.

Method of determination of corrosion rate

The present invention relates to a method for inhibiting corrosion of corrosion-prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of certain sulfur and phosphorus-free aromatic compounds substituted with nitrogen, containing functional groups at the 5- or 3, 5-position, typically up to 1000 wppm, to the metal surface.

Method for inhibiting corrosion using certain phosphorus and sulfur-free compounds

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Annandale, NJ, United States of America

Cheayao Zhang