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small-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
... to the back reflection, at right on the screen. Between these two signals are indications of echoes from any interfaces within the test piece. One small signal corresponding to the flaw shown in the test piece, also illustrated in Fig. 11 , appears between the initial pulse and the back reflection...
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: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001296
EISBN: 978-1-62708-170-2
... coating material ( Fig. 1b ), anodic protection of the substrate is observed. The anodically polarized coating is uniformly dissolved, and in general the relatively small cathodic area yields a low rate of corrosion. Figure 2 schematically illustrates some typical examples of corroded coating...
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: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003647
EISBN: 978-1-62708-182-5
... of microorganisms Electrochemical Techniques Electrochemical techniques used to study MIC include those in which no external signal is applied (redox potential, E corr , electrochemical noise, or ECN), those in which only a small potential or current perturbation is applied (polarization resistance...
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: 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: 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...
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.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.a0003465
EISBN: 978-1-62708-195-5
... provides an overview of the composite failure modes affected by matrix resin and testing approach. differential scanning calorimetry dynamic mechanical analysis mechanical failure modes polymer composite thermomechanical analysis FAILURE OF A COMPOSITE STRUCTURE can be caused by several...
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...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003235
EISBN: 978-1-62708-199-3
..., inclusions, and other flaws in plastic or ceramic materials. It also discusses the advantages and disadvantages and the general approaches that have been used in the development of microwave nondestructive inspection. ceramic materials delamination testing dielectric substrates inclusion testing...
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 Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006446
EISBN: 978-1-62708-190-0
... to the relative bandwidth of the resonance. Figure 5 shows a typical experimental configuration used in dynamic acoustoelastic testing. The specimen is vibrated at one of its axial resonances (typically at a few kilohertz) by a piezoelectric transducer driven by a high-power signal generator. The backside...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006471
EISBN: 978-1-62708-190-0
... ultrasonic waves; some examples are shown in Fig. 1 ( Ref 1 , 2 ). Conventional technologies most commonly have used single-element piezoelectric-based transducers that couple energy into a part using a couplant. This couplant can be a grease or gel in contact testing, or a large volume of fluid, commonly...
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...