J. Gollner et A. Burkert, ELECTROCHEMICAL NOISE MEASUREMENTS AT A PLANT FOR CONDITIONING OF INDUSTRIAL-WASTE WATER, Werkstoffe und Korrosion, 49(9), 1998, pp. 691-699
Damage by pitting corrosion occured at parts of a plant (duplex steel,
material no. 1.4462) for conditioning of process and waste waters aft
er some weeks. By examination of the electrochemical noise it should b
e analyzed, under which conditions increased corrosion propensity (pit
initiation) appears and whether another material (Alloy C 4, material
no. 2.4610) has a higher corrosion resistance under the given conditi
ons. As example for practical use of electrochemical noise diagnostic
under operating conditions it is shown, how several short time tests u
nder different medium conditions allow to draw conclusions with respec
t to to the corrosion propensity of the materials examined. The compar
ison with results from accompanying laboratory examinations have shown
good agreement. The great influence of ammonium concentration on the
corrosion behaviour of the duplex steel was recognized in all investig
ations examined.