Control of Corrosive Environments

A corrosion inhibitor reduces the corrosion rate of a metal exposed to that environment. Inhibition is used internally with carbon steel pipes and vessels as an economic corrosion control alternative to stainless steels and alloys, coatings, or non-metallic composites, and can often be implemented without disrupting a process. The major industries using corrosion inhibitors are oil and gas exploration and production, petroleum refining, chemical manufacturing, heavy manufacturing, water treatment, and the product additive industries. 

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Review on Chemical Control of Corrosive Environments in the Oil and Gas Industries... 

It also deals with the control of corrosive environments by inhibitors, general requirements for the petroleum and chemical industries, and utility systems such as cooling water, boiler water systems etc. 

The main purposes of corrosion testing are (i) evaluation and selection of materials for a given application (ii) evaluation of new or old materials to determine the environments which are suitable (iii) control of corrosion resistance of the material or corrosivity of the environment and (iv) study of the corrosion mechanism. 

Abstract Quality control of corrosion test results implies the validation of the corrosion test method and estimation of the uncertainty of corrosion rate measurement. The corrosion test in an artificial atmosphere of the salt spray mist needs evaluation of corrosivity of the test cabinet by reference specimens. Such calibration of corrosion environment raises very strict requirements for the method description and details of all procedures and used specimens. Reliable corrosion measurements by spray tests require validation of the experimental device together with the experimental procedure and determination of corrosivity uncertainty of the test cabinet environment. 

One of the most common methods used in industry for the control of corrosion is to apply a protective coating to material surfaces. The type of protective coating and the method of application depend on a wide variety of factors which include operating conditions, the immediate environment, whether indoors or outdoors, the likely risk of damage, and appearance. 

Adjustments of environment to improve protection through control of corrosiveness... 

Methods that have evolved over the years for combating corrosion include inhibition, material selection, cathodic or anodic protection coating and control of the environment. 

Molybdenum improves the corrosion resistance of stainless steels that are alloyed with 17—29% chromium. The addition of 1—4% molybdenum results in high resistance to pitting in corrosive environments, such as those found in pulp (qv) and paper (qv) processing (33), as weU as in food preparation, petrochemical, and poUution control systems. 

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