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microbial degradation

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Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006866
EISBN: 978-1-62708-395-9
... Abstract Microbial degradation in the environment is initiated by abiotic (nonliving physical or chemical) processes. Mechanical weathering and other mechanical processes are the main drivers of the initial degradation. This article presents an overview of weathering and biodegradation...
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
... inhibitors degradation environmentally assisted cracking failure analysis heat exchangers inspection iron lubricants microbially induced corrosion piping sampling steel tanks MICROORGANISMS can directly or indirectly affect the integrity of many materials used in industrial systems. Most...
Image
Published: 15 May 2022
Fig. 1 General concept of plastic degradation by microorganisms. (a) Enzymes from bacteria attached to high-molecular-weight fibers. (b) Assumed transport of mono- and oligomers into the cell and microbial metabolism. Today, only a few enzymes involved in plastic degradation have been More
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
... of microbial activity and the corrosion process. Then, various mechanisms that influence corrosion in microorganisms are discussed. The focus is on the incremental activities needed to assess the role played by microorganisms, if any, in the overall scenario. The article presents a case study that illustrates...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006871
EISBN: 978-1-62708-395-9
... O. , Boven G. , Microbial Growth on Outdoor-Weathered Plastics , Polym Degrad Stabil , Vol 163 , 2019 , p 206 – 213 10.1016/j.polymdegradstab.2019.03.013 10. ASTM G7/G7M , “ Standard Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials ,” ASTM...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006939
EISBN: 978-1-62708-395-9
... the processability window, shelf life, appearance, flame retardancy, and other properties required to fulfill the application of the material. For example, one of the most-used polyolefin materials, polypropylene, would not be commercially successful without additives, because it is likely to degrade within one week...
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
..., aggregate reactions, surface air permeability, and a microbial survey. Beam Condition Survey Visual observations showed a thin layer of cementitious material partially delaminating from the outer surface of the beam. This layer contained the linseed oil applied in 1969. It was removed by sand...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001683
EISBN: 978-1-62708-234-1
... the mode and rates of attack. In the present case, stainless steel piping was degraded via MIC attack. The major affecting species were identified as pedomicrobia and hyphomicrobia , which are iron and manganese oxidizing microorganisms. The slower attack of the high-Cr ferrite (∼ 30% Cr) in the present...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001648
EISBN: 978-1-62708-234-1
... been directed upward in service. The bottom end of the coupling was less degraded. In general, based on visual observation alone, there was substantial evidence of corrosive attack on the coupling that fractured as well as on the other two couplings that had been continually submerged...
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
.... The samples can be analyzed by culturing for microbial growths, which can be identified by various methods. If only a dried deposit is available, it still could be worth testing. The MIC kits are available for collection and shipping of corrosion deposit to special analysis laboratories. Specific Analysis...
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
... currents can be a source of increased galvanic degradation. Altering the Electrolyte The use of corrosion inhibitors is effective in some cases. Elimination of cathodic depolarizers (deaeration of water by thermomechanical means plus oxygen scavengers such as sodium sulfite or hydrazine) is very...
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
... applications. The electric potential of an object can be changed to protect it. A direct-current potential can be applied on it through the use of a rectifier, battery, or solar cell. Conversely, stray currents can be a source of increased galvanic degradation. Altering the Electrolyte The use...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006925
EISBN: 978-1-62708-395-9
... linked to each other by covalent bonds or perhaps hydrogen bonds. This cross linking may have been done intentionally—to improve the stiffness or temperature resistance of the polymer, for example—or it may have happened unintentionally because of some degradation process, such as oxidation or weathering...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006822
EISBN: 978-1-62708-329-4
..., it covers the use of transmission pipeline in North America, discusses the procedures in pipeline failure analysis investigation, and provides a brief background on the most commonly observed pipeline flaws and degradation mechanisms. A case study related to hydrogen cracking and a hard spot is also...
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
..., although interruption in the cathodic protection service will adversely affect its performance. The effectiveness of the cathodic protection on established microbial deposits is questionable. Recommendations The tank floor was ultrasonically tested, and portions of the floor replaced based...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006813
EISBN: 978-1-62708-329-4