Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
Research Paper
Solution pH and Specific Solution Volume to Specimen Surface Area on Corrosion Reactions and Hydrogen Absorption of Steel in Solutions Containing Thiocyanate Ion.
Mikiyuki IchibaKenichi TakaiJun'ichi Sakai
Author information
JOURNAL FREE ACCESS

2016 Volume 65 Issue 2 Pages 67-74

Details
Abstract

An ammonium thiocyanate (NH4SCN) solution is widely used in hydrogen embrittlement evaluations of high-strength steel materials. It is known that an increase in the specific solution volume to the specimen surface area results in a severe evaluation in hydrogen embrittlement testing. The reason for that is explained in this paper based on the change in the solution pH induced by a cathodic reaction, which accompanies thiocyanate ion decomposition and governs hydrogen absorption. In addition, the pH dependence of the cathodic reaction governing hydrogen absorption is made clear by using a sodium thiocyanate solution containing a buffer solution to control the solution pH. It is shown that immersing steel specimens in the pH-controlled sodium thiocyanate solution achieves a higher hydrogen content compared with the level attained with the NH4SCN solution.

Content from these authors
© 2016 Japan Society of Corrosion Engineering
Previous article
feedback
Top