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noble metals

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170550
EISBN: 978-1-62708-297-6
.... and published by Pergamon Press in 1978 ) • Smith G.D. and Zysk E. , Corrosion of the Noble Metals , Corrosion , Vol 13 , ASM Handbook , ASM International , 1987 , p 793 – 807 The noble metals include silver, gold, and the six platinum group metals—platinum, palladium...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850509
EISBN: 978-1-62708-260-0
... Abstract This appendix provides a list of etch compositions and procedures that reveal the macrostructure of aluminum, beryllium, bismuth, antimony, cobalt, copper, lead, magnesium, nickel, tin, titanium, zinc, and their respective alloys as well as iron, steel, noble metals, refractory metals...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030019
EISBN: 978-1-62708-282-2
... they are electrically coupled in a conductive solution. The direction of electron flow, and therefore the galvanic behavior, depends on which metal or alloy is more active. The more active metal or alloy becomes anodic, and the more noble metal or alloy becomes cathodic in the couple. Selected...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030082
EISBN: 978-1-62708-282-2
.... and Pickering H.W. , The Effects of Potential and Kinetic Parameters on the Formation of Passivating Noble Metal Rich Surface Layers during the Selective Dissolution of Binary Alloys , Corros. Sci. , Vol 38 , 1996 , p 1245 – 1267 10.1016/0010-938X(96)00015-7 49. Chen J.S. , Sanz F...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910099
EISBN: 978-1-62708-250-1
... or parting corrosion, is a corrosion process in which the more active metal is selectively removed from an alloy, leaving behind a porous weak deposit of the more noble metal. Specific categories of dealloying often carry the name of the dissolved element. For example, the preferential leaching of zinc from...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350011
EISBN: 978-1-62708-315-7
... reaching the component surface. Examples of barrier coatings include painted steel structures, steels lined with thick acid-proof brick, steels lined with rubberlike materials, or steels electroplated with a noble (see Table 1 ) metal (e.g., chromium, copper, or nickel). Protection is effective until...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.9781627082501
EISBN: 978-1-62708-250-1
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910363
EISBN: 978-1-62708-250-1
... μm (0.04 mil) for ion implanted surfaces to more than 6 mm ( 1 4 in.) for clad metal surfaces. The two classes of metallic coatings are noble (cathodic) coatings and sacrificial (anodic) coatings. A noble metal coating is more corrosion resistant than the substrate, and it provides...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120123
EISBN: 978-1-62708-269-3
... resistant in the same way that gold or other noble metals are corrosion proof. Rather, as stated above, titanium relies on the formation of a strongly protective oxide for protection against the environment. When a satisfactory oxide surface film is present then, in electrochemical parlance, titanium...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910021
EISBN: 978-1-62708-250-1
... combination. One possibility shown in Fig. 1 is that the metal is immune in an environment. Metals known to display this immunity are called noble metals and include, for example, gold, silver, and platinum. For a combination of metal and environment resulting in immune behavior...
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
... values indicates a wide range in inherent tendencies to corrode. The more noble metals are at the more positive values. The more active metals, those prone to corrosion, are at the more negative values. Table 5 Standard electrode potential for selected metals at 25 °C (75 °F) Electrode...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870179
EISBN: 978-1-62708-299-0
... Galvanic series of selected metals and alloys in seawater Noble or cathodic Platinum Gold Graphite Titanium Silver Chlorimet 3 (Ni- 18Cr- 18Mo) Hastelloy C (Ni-17Cr-15Mo) 18–8 stainless steel with molybdenum (passive) 18–8 stainless steel (passive) Chromium stainless...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090303
EISBN: 978-1-62708-266-2
... in which the basal planes are perpendicular to the potential plane for crack propagation. However, texture is a parameter that is sometimes very difficult to control (e.g., weld metals). It was stated earlier that zirconium becomes susceptible to SCC in neutral halide solutions if coupled with a noble...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910001
EISBN: 978-1-62708-250-1
... on corrosion at their various meetings. Each metal and alloy has unique and inherent corrosion behavior that can range from the high resistance of noble metals, for example, gold and platinum, to the low corrosion resistance of active metals, for example, sodium and magnesium. Furthermore, the corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030235
EISBN: 978-1-62708-282-2
... metals should be more noble than base metals. Transition joints can be used when a galvanic couple is anticipated at the design stage, and weld beads should be properly oriented to minimize galvanic effects. (c) Local damage can result from cuts across heavily worked areas. End grains should not be left...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910301
EISBN: 978-1-62708-250-1
... of dissimilar metals introduces the possibility of galvanic corrosion, and small anodic (corroding) areas should be avoided wherever this contact is apparent. Fig. 11 Design details that can affect galvanic corrosion. (a) Fasteners should be more noble than the components being fastened; undercuts should...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870191
EISBN: 978-1-62708-299-0
... galvanic corrosion. (a) Fasteners should be more noble than the components being fastened; undercuts should be avoided, and insulating washers should be used. (b) Weld filler metals should be more noble than base metals. Transition joints can be used when a galvanic couple is anticipated at the design...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230459
EISBN: 978-1-62708-298-3
... is different for every metal. When two dissimilar metals are placed in a conductive solution in contact or electrically connected, this potential difference will result in a flow of electrons from the less noble to the more noble metal. The less noble metal (anode) will corrode (dissolve) more rapidly...
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
... similar to noble metals. This noble behavior is attributed to the presence of the thin oxide layer on the metal surface. The mechanism of formation and the structure of the passive film have been extensively studied but are still not completely understood. Passivity can be achieved by alloying...