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Zinc coatings

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Published: 01 January 2000
Fig. 7 Principles and mechanism of galvanic protection of a substrate by a coating. Galvanic protection of a steel substrate at a void in a zinc coating. Corrosion of the substrate is light and occurs at some distance from the zinc. More
Image
Published: 01 March 2001
Fig. 14 Principles and mechanism of galvanic protection of a substrate by a coating. Galvanic protection of a steel substrate at a void in a zinc coating. Corrosion of the substrate is light and occurs at some distance from the zinc. More
Image
Published: 01 January 2000
Fig. 11 Service life (time to 5% rusting of steel surface) versus thickness of hot dip galvanized (zinc) coating for selected atmospheres Atmosphere Description Heavy industrial atmospheres These contain general industrial emissions such as sulfurous gases, corrosive mists More
Image
Published: 01 July 1997
Fig. 6 Wire-end preparation for upset butt welding. The preparation was changed from chisel end (a) to square end (b) to eliminate test failures in welded zinc-coated AISI 1080 or 1055 steel wire. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910363
EISBN: 978-1-62708-250-1
... is achieved by the addition of inhibitive pigments to paints. Sacrificial protection is achieved by coating the substrate with a more active metal. This results in the substrate becoming the cathode in the corrosion cell. Galvanized steel, which is comprised of a thin layer of metallic zinc over a steel...
Image
Published: 01 February 2005
Fig. 7.5 Zinc phosphate coating and soaping lubrication system. [ Bay, 1994 ] More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350125
EISBN: 978-1-62708-315-7
... (commonly steel or galvanized steel), very specialized high-speed roller application equipment is used to coat the sheet steel as it is unwound from a coil. The paint used in the coil-coating process can be of virtually any generic type, although alkyds, polyesters, epoxies, and zinc-rich epoxy coatings...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730149
EISBN: 978-1-62708-283-9
... ores, and 30% from recycled zinc. The level of recycling is increasing in step with progress in zinc production technology and zinc recycling technology. The supply of zinc-coated steel scrap increases annually as more auto body steel is galvanized. Approximately half of the world’s steel...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870179
EISBN: 978-1-62708-299-0
... discontinuous silicon carbide/aluminum MMCs ( Ref 11 ). Aluminum flame- and arc-sprayed coatings exhibit excellent corrosion resistance for a minimum of 33 months. Zinc arc-sprayed coatings are less corrosion resistant than aluminum thermal-sprayed coatings. Zinc coatings protect the silicon carbide/aluminum...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220445
EISBN: 978-1-62708-259-4
... to martensite. Retained austenite is present. SEM, SE. Etchant: nital 2%. Courtesy of J. Speer, reproduced from Ref 14 with permission. 13.7 Coatings Steels for forming are frequently coated, mostly for corrosion protection. The two most common families of coatings are zinc-based coatings ( Ref 16...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350011
EISBN: 978-1-62708-315-7
... combinations of metals as close together as possible in the galvanic series), insulating dissimilar metals, applying a barrier coating to both the anodic (less noble) and cathodic (noble) metal, applying a sacrificial coating (aluminum, zinc, or cadmium) to the cathodic part, applying nonmetallic films (e.g...
Image
Published: 01 August 2018
Fig. 13.34 (a) Cross section of a sheet coated by Galvalume. The aluminum-rich dendrites are darker. The interdendritic regions rich in zinc are lighter in SE mode in the SEM. (b) Transverse cross section of a steel sheet coated with Galvalume, partially corroded. The zinc-rich regions have More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350001
EISBN: 978-1-62708-315-7
... resistance and heat resistance Hot-dip galvanizing (zinc coatings) Improved corrosion resistance via sacrificial protection of steel substrate Hot-dip aluminizing Improved corrosion and oxidation resistance of steel substrate Hot-dip lead-tin alloy-coatings (terne coatings) Improved corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400073
EISBN: 978-1-62708-316-4
... used for automotive structural members, steel roofing, and architectural framing to vacuum-degassed interstitial-free steels used in applications demanding the highest available formability. Common steel coatings include zinc, aluminum, tin, lead, nickel, and various alloys of these metals, as well...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040067
EISBN: 978-1-62708-300-3
... ] 7.6.1 Ferrous Materials Carbon Steels Because of the severe deformation conditions typical of many cold forging operations, the most widely used lubrication system in the cold forging of carbon steels is a zinc phosphate coating and soaping system ( Fig. 7.5 ). However, simple forging processes...
Image
Published: 01 August 1999
Fig. 12 Coated discontinuous silicon carbide (particulate)/aluminum MMCs after seawater exposure. (a) Coated with ion vapor deposited aluminum; 4 month exposure. (b) Coated with plasma-sprayed aluminum oxide; 18 month exposure. (c) Coated with arc-sprayed zinc; 9 month exposure More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910237
EISBN: 978-1-62708-250-1
... of three types of corrosion protection. The epoxy paint provides a physical barrier to the corroding medium, the chromate conversion coating provides an inhibitor if the medium somehow penetrates the paint, and the galvanized coating (zinc) is an effective sacrificial anode (galvanic device) that diverts...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240323
EISBN: 978-1-62708-251-8
... that isolate the metal from the environment, or by cathodic protection. In cathodic protection, the metal to be protected is electrically connected to a more anodic metal, so that the sacrificial anodic metal corrodes instead of the metal being protected. For example, steel is often coated with zinc...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460209
EISBN: 978-1-62708-285-3
..., with the cold spray process, the coating materials can be sprayed on at once without any complicated midprocesses, and a dense, thick coating layer of zinc and flux can be deposited without microstructure change, oxidation, or decomposition. Figure 8.4 schematically shows the process of manufacturing...
Image
Published: 01 January 2000
(undercutting) of paint where exposed steel is rusting. (c) A void in the coating of a painted galvanized steel is sealed with zinc corrosion products; this avoids the undercutting seen in (a) and (b) and prevents further deterioration of the painted coating. Photograph courtesy of J. Lederer, Department More