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large-signal polarization test

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Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003644
EISBN: 978-1-62708-182-5
... available for laboratory studies of corrosion phenomena. The techniques and tests include no-applied-signal tests, small-signal polarization tests, large-signal polarization tests, scanning electrode techniques, and miscellaneous techniques. electrochemical corrosion electrochemical test...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006469
EISBN: 978-1-62708-190-0
...), and, to a certain degree, the shape and orientation of large flaws ( Fig. 9 ). C-scans: This format provides a semiquantitative or quantitative display of signal amplitudes obtained over an area of the test piece surface. This information can be used to map out the position of flaws on a plan view of the test...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006475
EISBN: 978-1-62708-190-0
... Abstract Electromagnetic signals at microwave and millimeter-wave frequencies are well suited for inspecting dielectric materials and composite structures in many critical applications. This article presents a partial list of reported nondestructive testing (NDT) application areas...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003659
EISBN: 978-1-62708-182-5
... of corrosion testing. corrosion-monitoring method electrical-resistance probe side-stream loop electrochemical noise hydrogen-probe corrosion rate ultrasonic thickness polarization-resistance corrosion potential alternating current data analysis IN-SERVICE MONITORING of industrial...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003647
EISBN: 978-1-62708-182-5
... values of 1 or less due to accumulation of H 2 SO 4 . Total corrosion loss determined from integrated R p data was less for the control sample than for the flushed sample. Large Signal Polarization Large signal polarization is applied to obtain potentiostatic or potentiodynamic polarization...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003656
EISBN: 978-1-62708-182-5
...-corrosion cracking. Because localized corrosion is isolated to certain areas and often has small lateral dimensions compared with its depth, detection methods that measure response over a large surface area, such as the widely used electrical resistance and linear polarization methods ( Ref 1 , 2 , 3 , 4...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001296
EISBN: 978-1-62708-170-2
... of measuring polarization resistance is that only a very small potential range has to be scanned, and thus the measurements take less time. On the other hand, a charge transfer-controlled condition can be reached with very low scan rates without a large increase in total measuring time. Impedance...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003586
EISBN: 978-1-62708-182-5
... for corrosion testing ( Ref 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ). This article highlights many of the commonly used laboratory methods used to determine instantaneous corrosion rates as well as methods that characterize corrosion thresholds that signal conditions...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006458
EISBN: 978-1-62708-190-0
... electromagnetic acoustic transducer (EMAT) for generating shear waves propagating normally away from the test block front surface and polarized predominantly perpendicular to the coil wires nearest to the test block surface. (b) Small spiral coil, radial shear-wave permanent magnet (PM) EMAT approximately 25 mm...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005683
EISBN: 978-1-62708-198-6
... current density determination by Tafel extrapolation, potentiodynamic measurement of the polarization resistance, electrochemical impedance measurement, and potentiostatic deaeration. Tests combining corrosion and mechanical forces, such as fretting corrosion tests, environment-assisted cracking tests...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003435
EISBN: 978-1-62708-195-5
... C b . If this situation is avoided, then the sample behaves as a simple dielectric. However, if this situation occurs, for example, for highly conductive resins, then charging of the electrodes through R masks other circuit responses. When 1/ R becomes large, electrode polarization becomes...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006478
EISBN: 978-1-62708-190-0
... under test, typically has a wide dynamic range (>120 dB on some systems), and easily detects problems in multilayered structures. By comparing TT signal loss in adjacent good areas, porosity, unbonds, wrinkles, delaminations, and most inclusions can be detected. In the case of porosity, the signal...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.9781627081900
EISBN: 978-1-62708-190-0
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003436
EISBN: 978-1-62708-195-5
... test, typically has a wide dynamic range (>120 dB on some systems), and easily detects problems in multilayered structures. By comparing TT signal loss in adjacent good areas, porosity, unbonds, wrinkles, delaminations, and most inclusions can be detected. In the case of porosity, the signal loss...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006454
EISBN: 978-1-62708-190-0
... nondestructive testing (NDT) methods in two key respects. The signal originates in the material itself, not in an external source, and AE detects movement, while most other methods detect existing geometrical discontinuities. Characteristics of AE inspection compared with other inspection methods include...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006451
EISBN: 978-1-62708-190-0
... a small decrease in temperature. From a practical standpoint, TSA entails correlating a representative signal (e.g., load or displacement) from a mechanical test (either fatigue or impulse loading) to the output of a sensitive IR detector in order to extract the temperature change due to the thermoelastic...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003236
EISBN: 978-1-62708-199-3
... the test piece. The echo-intensity signal from the receiver-amplifier is connected to the trace-brightness control on the oscilloscope to ensure that echoes are recorded as bright spots. In some systems, the brightnesses corresponding to different values of echo amplitude has sufficient contrast...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003026
EISBN: 978-1-62708-200-6
... of frequency over which important dielectric relaxations may take place. Testing techniques can be divided into two broad categories. The first category contains techniques used for low (<10 8 Hz) frequencies, in which the wavelength of the electric field is large compared to sample dimensions...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003653
EISBN: 978-1-62708-182-5
...-optic technology fluorescence method BECAUSE OF THE MAGNITUDE of the corrosion problem, its economic impact, and human safety factors, new methods for detecting and monitoring corrosion are being developed. Past efforts have resulted in new methods being used in the field or being tested...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006460
EISBN: 978-1-62708-190-0
... the entrance of the ultrasonic wave in the tested part and the return echo from the back wall of the part, or the measurement of the time interval between successive echoes. Flaw detection and characterization is based on the interaction of ultrasound with the flaw, which appears either as a reflection signal...