Although the corrosion rate of bare steel tends to decrease with time in most cases, the difference in the corrosivity of different atmospheres for a particular alloy can be tremendous.
The interiors of large pipelines carrying corrosive liquids may be lined with a suitable coating and protected with a strip-type galvanic anode material. If the pipe interior is bare, relatively large amounts of current may be needed.
The most common alloys used for exposure at high temperatures are the iron/nickel/chromium alloys, often referred to as stainless steels (SS). The materials used may be cast or wrought.
Although the primary focus of a corrosion engineer is on the chemical stability and corrosion resistance of these materials, it is critical to cooperate with other design team members familiar with the mechanical, physical, and other properties to ensure that the desired materials performance can be achieved.
A number of fundamental measures can be taken to address the problem of reinforcing steel corrosion. However, an important distinction has to be made in the applicability of remedial measures to new versus existing structures.
When compared with metals, polymeric materials tend to be more resistant to chloride ions and hydrochloric acid. However, polymeric materials are generally weaker and softer; less resistant to concentrated sulfuric and oxidizing acids and solvents; and subject to temperature limitations.
Because the process of corrosion is highly time-dependent, the integration of monitoring technology in existing systems can also provide early warning of costly corrosion damage and provide information on locations where damage is occurring, or possibly could occur.
Solvent-borne acrylic coatings made the first significant entry into the protective coatings market as color and gloss retentive topcoats for epoxy intermediate coats. The newer waterborne acrylics represent the forefront of this technology.
Corrosion engineers are familiar with the galvanic series, which lists noble and active metals, and with galvanic corrosion. This article looks at corrosion damage to aluminum caused by direct metal-to-metal contact with copper and by contact with copper-containing solutions.
Microbiologically influenced corrosion (MIC) is a major integrity threat for water treatment systems as well as other utility water systems. This article explores the shortcomings of erroneous chemical treatments and their main root cause(s).
With the Northern Hemisphere’s 2023 hurricane season in full swing and nearing its annual peak, emerging technologies and artificial intelligence are among new tools offering hope for superior pipeline protection against mighty storms.
Bob Chalker, CEO of AMPP and formerly NACE International, explains his decision to retire in July 2023 and outlines what the transition process will look like for the association over the coming months and years.
Brad Wilder, bridge painting division manager at Intech Contracting, LLC, shares perspective on his extensive time with the company and the role of associations like AMPP in helping enable that success.
With the increasing amount of high-voltage power line corridors, pipeline crossings, and transit systems, interference threats on pipeline assets are more common. This results in a higher risk of accelerated corrosion with poor notification to the pipeline operator.
In this newly released AMPP webcast, inspection and policy experts explore the basics of the building inspection process; strategies to ensure buildings are protected; and important resources and tools. They also respond to viewer questions.