An inhibitor is a substance that slows down a chemical reaction (in the present context, a corrosion reaction). Corrosion inhibitors are commonly added in small amounts to acids, cooling waters, steam, and many other environments—either continuously or intermittently—to reduce the intensity of corrosion that might otherwise threaten the intended design life of a structure.
The increased use of recycled water has led to the
need for an effective water treatment program to
prevent microbiologically influenced corrosion
(MIC). This article describes an investigation of
copper tubes in a chiller that failed from MIC
because of a poor water treatment program.
Tuberculation in waste water has long been a
concern. Causes are an adverse mixture of water
chemistry, construction materials, microbiological
attack, and flow rate. Low velocity permits
particulates and corrosion products to form
deposits. Accumulated deposition leads to partial or
complete blockage of pipelines, trapping of pigs,
under deposit corrosion, and tuberculation.
Tuberculation reduces flow rate. This article
discusses tuberculation and presents a case study.
This article presents experimental data that show
the solubility of lead in different waters. Specifically
noted is the solubility of lead in condensed, or
“pure,” water. It provides introductory information
to those just entering the field of water corrosion
and contamination as well as basic information
to others not familiar with water corrosion
This article compares three water quality indices for
the evaluation of water to be used in industrial
processes in Iran. They include the Puckorious
Saturation Index, Langelier Saturation Index, and
Ryznar Stability Index. The most applicable index
for use in that country is suggested.
This article presents the failure investigation of
internal pitting corrosion on a 30-in (0.762-m)
diameter subsea oil pipeline in western offshore
India. Detailed laboratory and analytical studies
were made on the failed sample to establish the
cause and mechanism of failure. This article
describes the analysis methodology, the probable
corrosion and failure mechanism, and recommended preventive measures.
An inhibitor is a substance that slows down a chemical reaction (in the present context, a corrosion reaction). Corrosion inhibitors are commonly added in small amounts, either continuously or intermittently, to control serious corrosion in aggressive environments such as acids, cooling waters, and steam. While they can be highly effective, many inhibitors are also toxic, particularly in the concentrations suitable for shipping and storage. It is important to employ precautions to ensure personnel safety, environmental protection, and uninterrupted operation of equipment.
The concentrations of various substances present in water in dissolved, colloidal, or suspended form are typically low but can vary considerably. The importance of these concentrations depends on the particular substance as well as the alloy, configuration, and function of the metallic structure with which the water comes into contact.