Bedeutung der Dynamischen Systemanalyse für Korrosionsuntersuchungen in Forschung und Praxis

Abstract

Voraussetzung fur einen optimalen Werkstoffeinsatz in der Technik ist die Kenntnis des dynamischen Korrosionsverhaltens des Systems. Im ersten Teil dieser Arbeit werden die Grundlagen der dynamischen Systemanalyse und ihre charakteristischen KenngroRen dargestellt. Die verschiedenen Mefirnethoden und prinzipielle Probleme bei der Interpretation der McBergcbnissc werden diskutiert. Im zweitcn Teil werden fur einfache Korrosionssysteme verschiedene Auswerteverfahren behandelt. Im dritten Ted werden charakteristische experimentelle Ergebnisse fur verschiedene Korrosionsinhibitoren und beschichtete Metalle, die von Bedeutung fur Korrosionsuntersuchungen in Forschung und Praxis sind, vorgestellt.For an optimal selection of structural materials in practical applications it is important to obtain a detailed knowledge of the dynamic corrosion behaviour of the system. The background of the dynamic system analysis and its parameters are derived in the first part of this paper. The different experimental procedures and principal problems in thc intcrpreta'tion of experimental results are discussed. In the second part different methods of analysis of impedance data are described for simple corrosion systems. Characteristic results for various corrosion inhibitors and coated metals during exposure to corrosive environments which are of importance for basic research as well as for practical applications are discussed in the third part.

Passivity and Pitting Susceptibility of type 304 Stainless Steel in Acidic Sulphate Solutions

“…To account for such behaviour, a model was proposed in which the double layer capacitance C dl is replaced by the constant phase element Q dl . The total impedance of such systems can be represented by the following transfer function [34].…”

Manufacturing and corrosion properties of ultrasound supported friction stir welded Al/Mg‐hybrid joints

“…[23] Jüttner et al also explained inductive behavior observed in the low frequency range of impedance spectra of pure iron in 0.5 M sulphuric acid by surface relaxation phenomena. [26] The EIS results of the two base alloys show that they exhibit strongly different corrosion behavior in the 0.5 molar NaCl solution. This should allow to discern the influence of the different base alloys on the corrosion properties of the nugget phases that are built during the FSW processes without or with US support.…”

Preparation and Characterization of Thiosemicarbazones Corrosion Inhibition Effect and the Antimicrobial and Anticancer Effect on their Metal Complexes

“…This circuit consists of the resistance of solution (Rs) between the working electrode and the counter electrode, and the double-layer capacitance (C dl ) in parallel to the charge-transfer resistance (R ct ). Thus, this takes into account the deviation of the double layer behavior from the ideal capacitance due to surface in homogeneity (Jiittner et al, 1985). Also, very good fit to the equivalent circuit model was obtained as shown in Figure 8 in solid line.…”