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organic zinc-rich coatings

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Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003549
EISBN: 978-1-62708-180-1
... of corrosion are described in more detail in Corrosion , Volume 13 of the ASM Handbook. However, as a brief introduction, the electrochemical nature of corrosion can be illustrated by the attack on zinc by hydrochloric acid. When zinc is placed in dilute hydrochloric acid, a vigorous reaction occurs...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001808
EISBN: 978-1-62708-241-9
... is gradually decreased by insulating corrosion products, i.e., zinc oxide, zinc carbonate, etc. It has even been reported that a slight reversal of polarity can occur, i.e., the remaining zinc coating is the cathode and the exposed steel is now the anode [ 12 ]. While the conditions of bacteria-rich river...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006782
EISBN: 978-1-62708-295-2
..., and the application of preventive measures. The fundamentals of corrosion are described in more detail in Ref 2 . However, as a brief introduction, the electrochemical nature of corrosion can be illustrated by the attack on zinc by hydrochloric acid (HCl). When zinc is placed in dilute hydrochloric acid, a vigorous...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001656
EISBN: 978-1-62708-219-8
... and epoxy-coated bar. Chlorides Reinforced concrete Reinforcement bars Zinc coatings Steel reinforcing bar Corrosion fatigue Introduction Procedure and Results Conclusions Acknowledgments References References 1. Roper H. and Hetherington G. , “Fatigue Tests...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006788
EISBN: 978-1-62708-295-2
... wrap coating on a buried pipeline in wet, anaerobic, high-clay soil features soft, black corrosion products rich in iron sulfide, FeS, and iron carbonate, FeCO 3 , overlying severe pitting. Fig. 4 Overlapping pits associated with corrosion by sulfate-reducing bacteria under iron sulfide/iron...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003556
EISBN: 978-1-62708-180-1
.... This type of failure presents an inherently greater risk than formation of a leak due to perforation of the steel by isolated pitting. Fig. 11 FeS/SRB corrosion under disbonded polyolefin tape coating on a buried pipeline in a wet anaerobic location shows soft, black corrosion products rich in iron...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001528
EISBN: 978-1-62708-219-8
.... The whitish deposits on the tank OD exhibit high calcium levels as expected for mineral deposits from water leakage and evaporation. Finally, the black foam is high in chlorine, aluminum, carbon, and oxygen, with lesser amounts of zinc ( Fig. 6 ). Apparently, the black foam insulation is the source...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006785
EISBN: 978-1-62708-295-2
... for the development of season-cracks” ( Ref 3 ), and, in the case of cartridge brass, it was determined that this agency was an environment that contained ammonia. It was concluded that season cracking was the result of the chemical composition of the metal, specifically the amount of zinc in the brass alloy...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006756
EISBN: 978-1-62708-295-2
... depressions Mottled appearance Needlelike iron-rich crystals Sodium-rich deposits Rounded depressions Intergranular cracking Chloride sometimes present in deposit Rounded depressions Thick grayish deposit of NaFePO 4 (maricite) at metal surface covered by black and white deposits No intergranular cracks...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006783
EISBN: 978-1-62708-295-2
... container but becomes cathodic when the can is opened and exposed to air. Zinc is an active metal. It is susceptible to galvanic corrosion and is widely used for galvanic anodes, in cathodic protection as a sacrificial coating (for example, galvanizing or electroplating), and as a pigment in certain types...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003548
EISBN: 978-1-62708-180-1
... container, but becomes cathodic when the can is opened and exposed to air. Zinc is an active metal. It is susceptible to galvanic corrosion and is widely used for galvanic anodes, in cathodic protection as a sacrificial coating (for example, galvanizing or electroplating), and as a pigment in certain types...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001702
EISBN: 978-1-62708-219-8
... in) thick (equivalent to about 0.8 mm ( 1 32 in) loss of metal); steel rocker assemblies badly rusted. September 1969 - first repairs; damaged concrete removed, steel rebar sandblasted; some rebar primed with epoxy; other rebar coated with inorganic zinc coating; patch constructed; patch...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003553
EISBN: 978-1-62708-180-1
..., although not necessarily improper, result in similar carbide precipitation. The path of SCC in some metals is not governed completely by composition and structure of the metal but is also influenced by the environment. For example, the path of cracking in copper-zinc alloys can be made transgranular...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003529
EISBN: 978-1-62708-180-1
... interact with the specimen in several ways. Higher-atomic-number elements “reflect” or backscatter more electrons than lower-atomic-number elements. This makes higher-atomic-number–rich areas of a specimen appear brighter. The SEM backscatter mode is often useful for rough composition analysis...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001769
EISBN: 978-1-62708-241-9
... (SRB). The reaction typically occurs in anaerobic environments rich in sulphate and organic matter. Under these circumstances, organic matter can be consumed by SRB carrying out sulphate reduction, sulphide and metabolic CO 2 is released. (Eq 6) CaSO 4 ⋅ 2 H 2 O ↔ Ca 2 + + SO...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
... corrosion products, and deposits or coatings). Testing under simulated service conditions Finally, the investigation concludes with a synthesis and interpretation of results. This step may actually require reiteration of previous steps or the introduction of new steps. Similar to design, failure...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003555
EISBN: 978-1-62708-180-1
..., the material microstructure and composition, refractory phase(s), and the temperature. All ceramics or refractories used in an oxygen-rich environment are oxides or develop a protective oxide on their surface (such as SiO 2 on SiC or Si 3 N 4 ). Although oxide ceramics are inert and resist oxidation...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
... oxidation rate versus temperature. LTHC, low-temperature hot corrosion; HTHC, high-temperature hot corrosion. Courtesy of U.S. Navy Fig. 26 Schematic of cross section of a thermal barrier coating (TBC). Calcium-magnesium-alumino-silicate (CMAS) deposits on the TBC surface, which upon melting...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001818
EISBN: 978-1-62708-180-1
.... Therefore, complete control of composition is of the utmost importance when welding is involved. As an example of improper material specification or use, galvanized steel clips were welded to stainless steel piping. The galvanized (zinc) coating became molten during the welding process, and the liquid...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006779
EISBN: 978-1-62708-295-2