The availability of a standard procedure, standard material, and standard plots should allow the investigator to check his laboratory technique. This practice should lead to electrochemical impedance curves in the literature which can be compared easily and with confidence.

Samples of a standard ferritic type 430 stainless steel (UNS 430000) used to obtain the reference plots are available for those who wish to check their equipment. Suitable resistors and capacitors can be obtained from electronics supply houses.

This test method may not be appropriate for electrochemical impedance measurements of all materials or in all environments.

1. Scope

1.1 This practice covers an experimental procedure which can be used to check one's instrumentation and technique for collecting and presenting electrochemical impedance data. If followed, this practice provides a standard material, electrolyte, and procedure for collecting electrochemical impedance data at the open circuit or corrosion potential that should reproduce data determined by others at different times and in different laboratories. This practice may not be appropriate for collecting impedance information for all materials or in all environments.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1193 Specification for Reagent Water

G3 Practice for Conventions Applicable to Electrochemical Measurements in Corrosion Testing

G5 Reference Test Method for Making Potentiostatic and Potentiodynamic Anodic Polarization Measurements

G15 Terminology Relating to Corrosion and Corrosion Testing

G59 Test Method for Conducting Potentiodynamic Polarization Resistance Measurements

Keywords

ac impedance; algorithm verification; Bode; dummy cell; equipment verification; electrochemical impedance; electrochemical impedance spectroscopy; electrochemical measurement; Nyquist; polarization resistance; steel; Instrumental measurement; Nyquist frequency response; Polarization resistance; Reference materials (RM); Steel; A-C (alternating-current) impedance; Algorithms; Bode frequency response; Corrosion; Current measurement; Dummy cell; Electrochemical impedance spectroscopy; Electrochemical measurements/testing; Impedance ;

ICS Code

ICS Number Code 71.040.40 (Chemical analysis)

Citing ASTM Standards

[Back to Top]