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Engineer's Guide to Corrosion: Part 3

Posted November 25, 2016 12:00 AM by Engineering360 eNewsletter

Read all three parts of our series on corrosion basics for engineers. Part 1 outlined the basic corrosion mechanism in acid. Part 2 emphasized that most materials in modern steam generators are steel-based. And Part 3 examines corrosion issues, including a discussion of control methods. One approach to inhibit corrosion in carbon steel condensate/feedwater systems is the use of amine, an organic compound derived from ammonia. Ammonia can provide enough alkalinity to also protect the steam generator proper, as long as impurity intrusion is prevented.


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Guru

Join Date: Aug 2008
Location: Florida & Ireland
Posts: 1001
Good Answers: 56
#1

Re: Engineer's Guide to Corrosion: Part 3

11/29/2016 10:48 AM

As an ex-water treatment chemist I much enjoyed your articles, but there are a few errors/typos that I would like to draw to your attention:

1) In Part 2 you refer to columbium and niobium alloys. These are, of course, one and the same element, the former being the old name.

2) In Part 3, you state "while the hydrophilic organic chain establishes a barrier to water." This should be "hydrophobic."

3) In Part 3, you state the chemical reaction:

MgCl2 + H2O → MgOH2 + HCl

This should be:

MgCl2 + 2H2O → Mg(OH)2 + 2HCl

Thanks!

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