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casing-to-anode separation

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Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004114
EISBN: 978-1-62708-184-9
... protection systems. These include the determination of cathodic protection current by the casing polarization and CPP tests or by mathematical models; calculation of casing-to-anode separation; isolation of the casing from other facilities; consideration of stray current interference from other dc power...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001742
EISBN: 978-1-62708-178-8
... the electrolyte by a porous membrane. A platinum gauze electrode is placed between the cathode and anode, and the circuit is completed. The separation and quantitative determination of metal ions from combinations of metals in alloys may be performed using constant current electrolysis if there is sufficient...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003169
EISBN: 978-1-62708-199-3
... ( aq ) + + 1 2 O ( g ) + 2 e − (Eq 19) S O 4 2 − + 2 H + ↔ H 2 SO 4 In this case, the potential required between cathode and anode in electrowinning is of the order of 1.25 to 1.75 V. This potential is the combination...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006679
EISBN: 978-1-62708-213-6
... to separate 0.1 g of Ag + from 0.3 g Cu 2+ using platinum-rhodium working and auxiliary electrodes and a 1.0 M Hg 2 SO 4 solution as the reference electrode. The instrument may be used as a potentiostat for polarography as well as a voltage amplifier and current/voltage converter. The anode may...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003599
EISBN: 978-1-62708-182-5
... cl is the resistance of catholyte, and R sp is the resistance of the separator if required. The basic components required for the electrochemical refining cell are an electrochemically soluble anode, a cathode, ionic contact between the electrodes (via an electrolytic solution...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004210
EISBN: 978-1-62708-184-9
... potential than the steel. This condition usually results in very rapid corrosion of the steel at local anodic sites that may, in some cases, actually consume the steel substrate. The article “Galvanic Corrosion” in Volume 13A of the ASM Handbook contains more information on this form of attack...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003607
EISBN: 978-1-62708-182-5
... and which is more noble. In some cases, the separation between the two metals or alloys in the galvanic series gives an indication of the probable magnitude of corrosive effect. The potential of a metal or alloy is affected by environmental factors. Corrosion product films and other changes in surface...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003608
EISBN: 978-1-62708-182-5
.... It can cause a blowout in the well to occur because of the corroded casing and can result in a fire or spill. Insulating flanges can cause corrosion from stray currents. Usually the insulating flange is separating pipes that have different ownership or different levels of cathodic protection...
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
... a direct electrical contact between the metal and the electrolyte. In the case of the formation of a nonconducting, pinhole-free surface layer (e.g., aluminum oxide on aluminum), no corrosion current is possible. This type of corrosion involves at least two or more separate electrochemical reactions...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005664
EISBN: 978-1-62708-174-0
... at the anode surface. For the general case of straight polarity, DCEN, the tip of the tungsten alloy cathode is ground to a point and then truncated somewhat to prevent the sharp tip from burning off and contaminating the weld. The included angle of the cone and the diameter of the truncation under some...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004175
EISBN: 978-1-62708-184-9
... metals coupled electrically. The result is an accelerated corrosive attack of the less noble material. Galvanic corrosion tends to be particularly severe if the anodic surface is small compared with that of the more noble cathode, or in cases where a more noble metal is coated onto a less noble one...
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006575
EISBN: 978-1-62708-210-5
..., good mechanical properties, and generous limitations on impurities. Corrosion resistance is only fair. They are generally considered to be all-purpose die casting alloys. Applications include housings for lawn mowers and radio transmitters, air brake castings, gear cases, air-cooled cylinder heads...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003592
EISBN: 978-1-62708-182-5
..., because a small cathodic current produces the reduction reaction (Cu 2+ + 2 e − → Cu), while an anodic current brings about the oxidation reaction (Cu → Cu 2+ + 2 e − ). Copper is a semi-noble metal and does not dissolve anodically in a solution of protons. In the case of the CuSO 4 /Cu electrode...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003583
EISBN: 978-1-62708-182-5
... diagram. Note: The solid lines are partial anodic and cathodic currents, not measurable currents. Fig. 10 Evans diagram for one anodic dissolution reaction coupled (separately) to one of two different oxidant reduction reactions. (a) The two oxidant reduction reactions have similar kinetic...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001255
EISBN: 978-1-62708-170-2
... are used, the tin dissolves as stannite; thus bronze anodes are not suitable for use. Dual anodes of copper and tin, where each type of anode has a separate current source, have been used. To eliminate the need for separate current sources, it is customary to use oxygen-free copper anodes and to add...
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
... potential for pits ( E rpp ). The definition of E p is based on the assumption that when the pits repassivate, the surface of the electrode exhibits the same anodic behavior as during the forward scan, and the measured current becomes the same. If that were the case, the reverse line would be expected...
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
...-controlled cathodic reaction and a charge-transfer-controlled anodic reaction. As the fluid velocity increases from 1 to 4, the corrosion rate increases from A to D. Fig. 7 Potential-current relationships for the case of a galvanic couple between two corroding metals. Iron is the more noble metal...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006512
EISBN: 978-1-62708-207-5
.... The technology involves the deposition of metal particles into the pores of anodic coatings. The component is clear anodized first using conventional anodizing methods and the metal deposition occurs in a separate tank. Available colors are limited to shades of bronze that range from champagne to black. The use...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.9781627081702
EISBN: 978-1-62708-170-2
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.9781627081825
EISBN: 978-1-62708-182-5