ID
× COMMENTARYCOVER STORYIN THE NEWSNEWSFRONTS
DechemaAchema 2018 Review
Sustainability, digitalization and flexible production approaches emerged as major themes…
CHEMENTATOR + Show More BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILEENGINEERING PRACTICEEQUIPMENT & SERVICESFOCUS
CADWorx & Analysis SolutionsFocus on Software
Software enables interactive analytics on collected data This company recently…
NEW PRODUCTS + Show More

Comment PDF Operations & Maintenance

Facts at your Fingertips: Corrosion complications

By Scott Jenkins, Chemical Engineering magazine |

Corrosion is an obvious factor to consider when selecting materials of construction for process equipment. However, the chemical environment of the process is only the starting point in selecting an acceptable material. A set of other factors can complicate corrosion-resistance strategies. This one-page reference summarizes several of these areas. Impurities The corrosive properties of a process fluid’s major constituents are usually known to process engineers. Less obvious, however, may be how the presence of impurities can cause corrosion. Here several examples: Chloride ions. An example of a harmful impurity is the chloride ion, which, under certain conditions, is known to cause stress-corrosion-cracking (SCC) and pitting of stainless steels. This insidious form of corrosion can occur at concentrations as low as a few parts per million. The negative influence of contaminating chloride and fluoride ions on steel’s corrosion resistance is amplified at higher temperatures. Increases of 10°C can almost double the corrosion rate. Corrosive gases and airborne contaminants. Airborne contaminants can include the following: airborne liquid droplets, including small levels of condensation and sea salt mist; solids, including grit,…
Related Content
What’s Corroding Your Control Room?
Corrosion-induced failures are frequent in the electronics products used in control rooms, but proper environmental assessment, control and monitoring can…

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Simplify sensor handling and maintenance with ISM
Three reasons to measure pH in-line
ABB Ability™ technology to transform BASF rotating equipment into intelligent machinery and improve uptime and reliability
Detect and correct anomalies early in your batch processes
ABB at ACHEMA 2018

View More

Live chat by BoldChat