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two-electrode system

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940023
EISBN: 978-1-62708-302-7
... or experimentally measure absolute values for G M + , G M 0 , ϕ M + ′ , or ϕ M 0 ′ . However, relative potential differences can be measured by connecting two electrode systems as indicated in the electrochemical cell of Figure 2.1...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290023
EISBN: 978-1-62708-306-5
... is cycled back and forth, the electricity is said to be operating as “alternating current” or ac mode. With dc operation, the workpiece can be either positive or negative relative to the electrode in the welding source. The two modes of dc operation are typically referred to as: Direct current...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.9781627082822
EISBN: 978-1-62708-282-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910049
EISBN: 978-1-62708-250-1
... and explain many of the material and environmental effects of observed in corrosion phenomena. The theory particularly delineates the importance of the reduction reactions in an electrochemical process as well as the anodic and dissolution process. Two basic premises underlie mixed-potential theory. First...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910427
EISBN: 978-1-62708-250-1
... for corrosion monitoring Table 11 Instrumentation for corrosion monitoring Method Measures or detects Notes Use Linear polarization (polarization resistance) Corrosion rate is measured by the electrochemical polarization resistance method with two or three electrode probes Suitable for most...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780164
EISBN: 978-1-62708-281-5
... or both of the two commonly used test methods developed and published by the ASTM Electrical Insulating Materials Committee D-9 ( Ref 3 , 4 ). These two methods are described below. Typical electrodes for dielectric strength testing Table 1 Typical electrodes for dielectric strength testing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910407
EISBN: 978-1-62708-250-1
... Schematic of an impressed-current cathodic protection system Concept of Cathodic Protection There are two types of cathodic protection systems. Sacrificial cathodic protection uses galvanic action in a beneficial manner to provide the current to the structure to be protected. An impressed-current...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290061
EISBN: 978-1-62708-306-5
.... The force can be equalized by using a spring-loaded electrode holder or a hydraulic equalizing system. Two arrangements of the secondary circuit for making two or more spot welds simultaneously by direct welding are shown in Fig. 3.4(a) and (b) . The use of a conductive plate or mandrel ( Fig. 3.4b...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280041
EISBN: 978-1-62708-267-9
... or no force is necessary to remove the solid electrode from the mold. The following sequence represents a nominal VIM cycle for the production of a heat in a two-chamber furnace. Most VIM operations will follow this general sequence, while specific practices, particularly with regard to vacuum...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940233
EISBN: 978-1-62708-302-7
... of the system at each frequency, | Z | lf and | Z | hf . The assumed equivalent electrical circuit for the system also is indicated in Fig. 6.21 . This circuit assumes that the simplest equivalent electrical circuit, as shown in Fig. 6.18 , is applicable to each of the electrodes in the two-electrode method...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.9781627082501
EISBN: 978-1-62708-250-1
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060369
EISBN: 978-1-62708-261-7
..., consider the example of two metals—iron and zinc—separately immersed in a weak mineral acid as shown in Fig. 15.4 . Both metals corrode from the acid (which by definition has a concentration of H + ions). For each metal, there is an electrochemical reaction—over the entire surface of each electrode...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110587
EISBN: 978-1-62708-247-1
.... A simple capacitor consists of a dielectric between two conductive materials. One way of having high capacitance in a small volume is to increase the dielectric-electrodes surface area in a given volume, which is done using different types of constructions, as listed in Table 1 . Different types of CAPS...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940127
EISBN: 978-1-62708-302-7
... electrode is one of uniform transport of cathodic species to the metal surface and anodic species from the surface with no attempt to define sites at which the anodic and cathodic reactions occur ( Ref 1 ). The two reactions are assumed to occur over a common area that is assigned to each reaction when...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030180
EISBN: 978-1-62708-282-2
... two functions. First, the electric potential must be measured and compared to the desired preset value. Second, a control signal must then be sent to the power supply to regulate the dc current between the cathode and vessel wall. In early systems, this control function was done in an on-off manner...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030184
EISBN: 978-1-62708-282-2
... Example 1. Outline of pier protected with a protective coating and sacrificial anodes Fig. 22 Example 2. Outline of H-pile pier protected using a protective coating and impressed-current anodes Fig. 16 Two views of polymer mesh anodes used to protect reinforcing steel in bridge decks...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040141
EISBN: 978-1-62708-300-3
... and optimize the configuration of the die segments. Figure 12.6 shows, as an example, two roll passes, simulated by the commercial software DEFORM 3-D [ SFTC, 2003 ]. The desired shape is produced by rolling the heated billet between two rotating dies having appropriately profiled grooves. After the first...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030089
EISBN: 978-1-62708-282-2
..., E7010-G, and E8018-C2. Two nickel-base electrodes—Inco-Weld A (American Welding Society, or AWS, A5.11, class ENiCrFe-2) and Incoloy welding electrode 135—were tested; they were found to be cathodic to the base metal and to prevent rapid weld corrosion. The corrosion rates of these various galvanic...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310011
EISBN: 978-1-62708-286-0
... to right form a closed circuit called an electrochemical cell . The cell is made up of four parts: the two electrodes where the charge transfer Reactions 2 and 3 take place (the anode and cathode , respectively), an electrolyte, and an electron pathway. It should be noted that electrodes are interfaces...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.9781627083027
EISBN: 978-1-62708-302-7