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sacrificial coating

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Published: 01 August 2013
Fig. 2 Schematic of current flows at defects in (a) noble and (b) sacrificial coatings More
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005709
EISBN: 978-1-62708-171-9
... Abstract Corrosion of marine- and land-based infrastructure is of major concern and its control forms an important objective. Thermal spray coatings (TSCs) are widely used for corrosion protection. This article focuses on two types of TSCs: cathodic or noble coatings and anodic or sacrificial...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003832
EISBN: 978-1-62708-183-2
... Abstract This article provides a general technical description of thermal spray coatings used for corrosion protection in atmospheric and aqueous environments. It further discusses two basic coating approaches of corrosion protection, namely, the sacrificial coating of thermal spray aluminum...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004107
EISBN: 978-1-62708-184-9
... Abstract A sacrificial coating applied to a steel substrate can add 20 years or more of life to the substrate, depending on its thickness and composition. Different techniques to apply sacrificial coatings offer various characteristics that contribute to corrosion resistance. This article...
Image
Published: 01 January 2006
Fig. 10 Schematics of typical coating systems. These include (a) the “as-deposited” pure aluminum or zinc sacrificial metallic coating, without the addition of any organics, applied to SAE 1018 steel; (b) the pure sacrificial coating applied to SAE 1018 steel plus a sealer or conversion coat More
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003808
EISBN: 978-1-62708-183-2
... Abstract From the standpoint of corrosion protection of iron and steel, metallic coatings can be classified into two types: noble coatings and sacrificial coatings. This article focuses on hotdipped zinc, aluminum, zinc-aluminum alloy and aluminum-zinc alloy coatings. It discusses the Sendzimir...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001322
EISBN: 978-1-62708-170-2
... of the replacement coatings sacrificially corrode to protect the substrate, so coating thickness exerts a significant influence on coating service life. In general, thicker sacrificial coatings contain more metal (i.e., greater coating weight) and will sacrificially corrode to protect the substrate steel...
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
... showing how breaks in mill scale (Fe 3 O 4 ) can lead to galvanic corrosion of steel Metallic Coatings Two types of metallic coatings are used in engineering design: noble metal coatings and sacrificial metal coatings. Noble metal coatings are used as barrier coatings over a more reactive metal...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004162
EISBN: 978-1-62708-184-9
... are relatively straightforward to identify or characterize. Steel, with zinc and zinc alloys applied as sacrificial coatings, currently is the predominant metallic material for automotive body panels and structures. Aluminum, stainless steel, metallic and metallic-coated fasteners, and metallized plastic trim...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004109
EISBN: 978-1-62708-184-9
... of the electrolyte (freshwater, concrete) makes sacrificial anodes impractical. Cathodic Protection of Marine Pipelines Corrosion control of marine pipelines is usually achieved through the use of protective coatings and supplemental CP. A variety of organic protective coatings can be used. They are usually...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003672
EISBN: 978-1-62708-182-5
... Abstract This article discusses the factors affecting corrosion behavior. It describes galvanic corrosion and its protection methods. The article also provides information on coatings and inhibitors, which are used in corrosion protection. corrosion galvanic corrosion coatings...
Image
Published: 01 January 2003
Fig. 21 Example 1 . Outline of pier protected with a protective coating and sacrificial anodes More
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006049
EISBN: 978-1-62708-172-6
... Abstract The use of zinc in corrosion-protective coatings is due to its higher galvanic activity relative to that of steel. Pure zinc dust provides the best sacrificial protection to steel in a galvanic couple. Zinc-rich coatings can be subcategorized according to the type of binder material...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003697
EISBN: 978-1-62708-182-5
... will be in the soil zone, 8 ft in the submerged zone, 3 ft in the tidal zone, and 5 ft in the atmospheric/splash zone ( Fig. 21 ). Fig. 21 Example 1 . Outline of pier protected with a protective coating and sacrificial anodes The pier is located in a calm saltwater bay. The water is not badly polluted...
Book Chapter

Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0006541
EISBN: 978-1-62708-183-2
...+paint or resin seal C Cadmium, beryllium Chromate conversion coating+paint or resin seal D Aluminum, Al-Mg, Al-Zn Anodic coating+paint or resin seal E Aluminum-copper Anodic coating+paint or resin seal F Steel, carbon and low alloy Metallic coating, sacrificial (Zn) or nonsacrificial...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004113
EISBN: 978-1-62708-184-9
..., are frequently protected with compatible coatings and ICCP. Consumption of sacrificial anodes could result in contamination of the water. The use of inhibitors with water systems is discussed in “Corrosion Inhibitors in the Water Treatment Industry” in Volume 13A. Crude oil storage tanks are frequently...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004126
EISBN: 978-1-62708-184-9
... is anodic or cathodic to the base metal. Of the electroplated coatings, only zinc and cadmium are anodic (sacrificial) to steel. The other electroplated coatings must be thick enough to create a barrier to chemical reactants to provide any level of corrosion resistance to the substrate metal. Figure 1...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004166
EISBN: 978-1-62708-184-9
... to isolate steel from aluminum, thereby eliminating electrical contact. An example of such a system is shown in Fig. 4 . The choice of the fastener protection material is critical. There are a number of sacrificial coatings that provide excellent protection against galvanic corrosion effects between...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005735
EISBN: 978-1-62708-171-9
..., “Corrosion Control for Marine- and Land-Based Infrastructure Applications” in this Volume, discusses galvanic cells and the difference between noble and sacrificial coatings. Coatings of interest to process industries are noble relative to the substrate. The galvanic couple formed by the contact of both...
Book Chapter

By Nabil Zaki
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001257
EISBN: 978-1-62708-170-2
... their alloying elements. Alloys of zinc, for example, can be designed to maintain anodic protection to steel, but remain less electrochemically active than pure zinc. Thus, a zinc alloy coating can still be sacrificial to steel components, but corrodes much more slowly than zinc when exposed to a corrosive...