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Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004163
EISBN: 978-1-62708-184-9
..., hot salt attack, and thermal fatigue. The article describes the various forms of corrosion which occur at the cold end of an exhaust system. The forms of cold end exhaust corrosion, including condensate pitting corrosion, exterior salt pitting, crevice corrosion, intergranular corrosion, and galvanic...
Abstract
Steel automotive exhaust systems suffer from various forms of corrosion. This article illustrates exhaust system components with typical upper metal skin temperatures and alloys of construction. It discusses high-temperature corrosion of automotive exhaust systems, including oxidation, hot salt attack, and thermal fatigue. The article describes the various forms of corrosion which occur at the cold end of an exhaust system. The forms of cold end exhaust corrosion, including condensate pitting corrosion, exterior salt pitting, crevice corrosion, intergranular corrosion, and galvanic corrosion.
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Published: 01 January 2006
Fig. 12 Exterior cyclic salt pitting test B after 25 weeks with a weekly 1 h 315 °C (600 °F) heat exposure and daily salt solution dip and humidity exposure
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Published: 01 January 2006
Fig. 13 Exterior cyclic salt pitting test B after 12 weeks with a weekly 1 h 425 °C (800 °F) heat exposure and daily salt solution dip and humidity exposure
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Published: 01 January 2006
Fig. 14 Exterior cyclic salt pitting test B after 12 weeks with a weekly 1 hr 540 °C (1000 °F) heat exposure and daily salt solution dip and humidity exposure
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Published: 01 January 2006
Fig. 11 Comparison of average pit depths over time for four exhaust stainless steel alloys exposed to cyclic exterior salt humidity cabinet pitting test A. See text for test details.
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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
... Abstract This article discusses the commonly encountered forms of automotive body corrosion. The corrosion forms include general or uniform corrosion, cosmetic or under-film corrosion, galvanic corrosion, crevice corrosion, poultice or under-deposit corrosion, and pitting corrosion. Corrosion...
Abstract
This article discusses the commonly encountered forms of automotive body corrosion. The corrosion forms include general or uniform corrosion, cosmetic or under-film corrosion, galvanic corrosion, crevice corrosion, poultice or under-deposit corrosion, and pitting corrosion. Corrosion-resistant sheet metals, such as electrogalvanized steel, hot dip galvanized steel, and hot dip galvannealed steel, are reviewed. The article provides information on the paint and sealant systems for corrosion control in automotive body applications.
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
... shows what can happen when the plating is a cathode with respect to the substrate metal and is not thick enough to be a barrier coating. The small-anode/large-cathode area ratio results in serious pitting of the underlying steel. Tin, lead, and aluminum coatings are an exception. They corrode readily...
Abstract
This article focuses on the various coatings used on Department of Defense (DoD) systems. These include electroplated coatings; conversion coatings; supplemental oils, waxes, and lubricants; organic paint coatings; and other finishes such as vacuum deposits, mechanical plating, thermal spray coatings, and hot-dip coatings. The article also lists the test requirements and time to failure of the coatings.
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006492
EISBN: 978-1-62708-207-5
... coatings and paints. It addresses some of the more common corrosion mechanisms, including corrosion driven by pH extremes, pitting corrosion, crevice corrosion, galvanic corrosion, and filiform corrosion. The article also describes in-plant as well as field application procedures for cleaning and coating...
Abstract
Although aluminum alloys are inherently corrosion resistant, there are many operating environments where they require additional protection. This article describes the conditions under which aluminum is prone to corrode and explains how to prevent it through the addition of conversion coatings and paints. It addresses some of the more common corrosion mechanisms, including corrosion driven by pH extremes, pitting corrosion, crevice corrosion, galvanic corrosion, and filiform corrosion. The article also describes in-plant as well as field application procedures for cleaning and coating, and discusses the advantages and limitations of the various materials and chemicals used.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006059
EISBN: 978-1-62708-172-6
... (PVC). The ductile pipe used today is generally primed on the exterior with only a thin coal-tar-based primer. Small-diameter service pipes such as these, whether made from ductile iron or PVC, tend not to be coated when buried. Larger-diameter sewer collection pipes that receive lateral flows along...
Abstract
This article provides information on the municipal wastewater system components such as piping, pump stations, headworks, clarifiers, aeration structures, digesters, biosolids dewatering equipment, and sludge stabilization. It explains the major corrosion damage mechanisms to which those component parts of the system are exposed. It presents useful guidelines for selecting and using protective coatings in municipal sewerage collection systems and water reclamation facilities in wastewater treatment plants. The article includes annotated flow diagrams of a wastewater collection system, wastewater treatment plants, and spreadsheets listing the most widely used generic coating systems by structure and substrate material. It concludes with a section on quality watchouts when selecting or using protective coatings in municipal wastewater systems.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006062
EISBN: 978-1-62708-172-6
...) can provide very cost-effective corrosion protection for steel structures, piping, and miscellaneous hardware such as hanger rods, fasteners, conduit, piping (exterior), and so on. Stainless steel and fiberglass-reinforced plastic (FRP) tanks and piping and concrete structures and surfaces are usually...
Abstract
Maintenance coating is an important part of any meaningful asset-preservation strategy in facilities producing pulp and paper and other chemicals. This article discusses maintenance coating for carbon steel structures and process equipment exposed to normal external pulp and paper mill atmospheric conditions. The important requirements and standards for surface preparation are emphasized and common issues encountered in maintenance coating projects are described.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003105
EISBN: 978-1-62708-199-3
..., most dissolved salts become ionized and increase the conductivity of water which, in turn, tends to localize corrosion, thus leading to severe pitting, The increased conductivity permits cathodic areas to become larger and causes anode and cathode reaction products to combine in the water instead...
Abstract
Corrosion of metals is defined as deterioration caused by chemical or electrochemical reaction of the metal with its environment. This article provides information on corrosion of iron and steel by aqueous and nonaqueous media. It discusses the corrosive environments of carbon and alloy steels, namely atmospheric corrosion, soil corrosion, corrosion in fresh water and seawater. The article describes the corrosion process in concrete, which tends to create conditions that increase the rate of attack. The focus is on the stress-corrosion cracking of steels; an environmentally induced crack propagation that results from the combined interaction of mechanical stress and corrosion reactions. The article tabulates a guide on corrosion prevention for carbon steels in various environments. It also discusses protection methods of steel from corrosion, including coatings, such as temporary protection, cleaning, hot dip coating, electroplating, thermal spray coatings, conversion coatings, thin organic coatings, and inhibitors.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006024
EISBN: 978-1-62708-172-6
... to prevent contamination of the preparation media (for example, to prevent contamination of steel abrasives that are recycled). Other specifications require the removal after preparation because the precleaning of rusted areas will likely not remove the salts in pits that are sheltered by the corrosion. Once...
Abstract
This article reviews the steps involved in presurface-preparation inspection: substrate replacement; removal of weld spatter, rounding of sharp edges, and grinding of slivers/laminations; and removal of rust scale, grease, oil, and chemical (soluble salt) contamination. It focuses on surface preparation methods that range from simple solvent cleaning to hand and power tool cleaning, dry and wet abrasive blast cleaning, centrifugal wheel blast cleaning, chemical stripping, and waterjetting for the application of the coating system. In addition, the article provides a description of the Society for Protective Coatings' (SSPC) standards and NACE International standards as well as the International Organization for Standardization (ISO) standards and International Concrete Repair Institute (ICRI) guidelines for surface cleanliness.
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004127
EISBN: 978-1-62708-184-9
.... Aerated halide solutions (e.g., chloride from salts) commonly result in pitting corrosion damage of aluminum alloys. This environment commonly occurs with maritime aircraft programs and aircraft deployed to aircraft carriers. The corrosion resistance of aluminum is strongly influenced by its chemical...
Abstract
This article describes the influences of the operational environments of U.S. Navy aircraft during corrosion-control process. The most widely used materials in airframe structures and components, such as aluminum, steel, titanium, and magnesium alloy systems, are reviewed. The article provides information on the inspections steps, corrosion-control issues, and corrosion-prevention strategies for naval aircraft. It contains a table that lists typical locations of corrosion on the aircraft. The article also provides examples of aircraft corrosion damage.
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004165
EISBN: 978-1-62708-184-9
... pitting in the less noble metal may lead to localized penetration at the bimetallic contact. A high salt load in a test may not be able to mimic this behavior. The overall corrosion rate will be high, but the associated high electrolytic activity that leads to the anodic reaction becomes “smeared out...
Abstract
Complete vehicle accelerated corrosion testing on the proving ground is a mandatory testing tool among vehicle manufacturers around the globe. This article focuses on creating some awareness of the difficulty in applying reliable corrosion tests for all corrosion-sensitive automotive systems at once. It describes the various factors for a complete vehicle testing, including wear from road grit, dirt, salt load, elevated temperatures, and mechanical effects such as chafing and fretting. The article discusses the four main test blocks, namely, driving sequence on various proving ground tracks, exposure of the vehicle in one or more ways to road deicing salts, static exposure to forced climatic conditions, and additional elements such as operating the mechanical systems of the vehicle, car washes, and so forth. It concludes with information on the major advantages and drawbacks of a full-service-life test.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006040
EISBN: 978-1-62708-172-6
... of steel and ductile iron pipe and graphitic corrosion of cast iron pipe. Figure 3 shows electrolytic pitting corrosion on a carbon steel transmission main. Note the exterior bituminous coating (circa 1924). Fig. 3 Electrolytic pitting corrosion on a carbon steel transmission main Figure 4...
Abstract
This article presents information regarding the use of protective coatings in municipal potable water systems, including raw water collection and transmission, water treatment plants, and treated water distribution. It provides useful guidance for the selection and use of protective coatings in these municipal water systems. The most commonplace corrosion-damage mechanisms are highlighted. The article describes the most common materials of construction found in municipal water systems, namely, cast iron, ductile iron, carbon steel, precast concrete cylinder pipe and reinforced concrete pipe, prestressed concrete tanks, and stainless steel. It provides information on the most common generic coating systems used for new steel tanks and water storage tanks. It concludes with a discussion of quality watch-outs when selecting or using protective coatings in municipal water systems.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006051
EISBN: 978-1-62708-172-6
... sealers because breathing film allows passage of water vapor. Used as interior and exterior coatings Asphalt pitch Good water resistance and ultraviolent stability. Will not crack or degrade in sunlight. Nontoxic and suitable for exposure to food products. Resistant to mineral salts and alkalis to 30...
Abstract
A coating can be defined as a substance spread over a surface to provide protection or to serve decorative purposes. This article discusses two industrial coating components, namely, nonvolatile components such as the resin or binder, pigments, and any additives that may be incorporated into the formulation; and volatile components such as solvents, or water in emulsions and their composition. It provides general information on volatile organic compounds. The article describes the film-forming mechanisms of various coating types, namely, lacquers, chemically converting coatings, latex coatings, alkyds and other resins, which cure by oxidation, moisture-curing polyurethanes and inorganic zinc primers, and powder coatings. The article concludes with a discussion on the functions of the primer, intermediate coat, and topcoat in coating systems.
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004104
EISBN: 978-1-62708-184-9
... and other pollutants due to a tightly adherent oxide film. Destruction of the oxide film will expose a very reactive surface. If the protective oxide film is disturbed, the presence of salts, including chlorides, can cause rapid pitting of aluminum. Nonanodized aluminum can suffer severe corrosion in marine...
Abstract
This article provides information on predesign surveys and the various testing procedures associated with wastewater treatment plants. These include soil testing, atmospheric testing, and hydrogen sulfide testing. The primary parameters that influence the production of sulfides within the piping system that transports the wastewater to the treatment facility are discussed. The article describes the corrosion performance of various materials in the soil, fluid, and atmospheric exposures. These include concrete, steel, ductile iron, aluminum, copper, brass, stainless steel, and coatings used for wastewater facilities.
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004169
EISBN: 978-1-62708-184-9
... Abstract This article describes the commonly observed forms of airplane corrosion, namely: general corrosion, exfoliation corrosion, pitting corrosion, microbiologically induced corrosion, galvanic corrosion, filiform corrosion, crevice corrosion, stress-corrosion cracking, and fretting...
Abstract
This article describes the commonly observed forms of airplane corrosion, namely: general corrosion, exfoliation corrosion, pitting corrosion, microbiologically induced corrosion, galvanic corrosion, filiform corrosion, crevice corrosion, stress-corrosion cracking, and fretting. It discusses the factors influencing airplane corrosion from the manufacturing perspective: design, manufacturing, and service-related factors. The article explains the collection of corrosion data and provides an overview of the implementation and evolution of airline corrosion prevention and control programs and directions being considered in the design for corrosion prevention of airplanes.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003198
EISBN: 978-1-62708-199-3
... is also suitable for neutral heating, as well as for cyanide and noncyanide carburizing processes. The molten salt is contained in a steel or ceramic pot surrounded by suitable insulating materials, which separate it from an exterior casing or framework of heavy-gage steel. The salt is heated by passing...
Abstract
Batch furnaces and continuous furnaces are commonly used in heat treating. This article provides a detailed account of various heat treating equipment and its furnace types, including salt bath equipment (externally heated, immersed-electrode and submerged-electrode furnaces), and fluidized-bed equipment (external-resistance-heated fluidized beds). It describes various auxiliary equipment used in cold-wall furnaces, namely, heating elements and pumping systems. Five types of heat-resistant alloys are used for furnace parts, trays, and fixtures: Fe-Cr alloys, Fe-Cr-Ni alloys, Fe-Ni-Cr alloys, nickel-base alloys and cobalt-base alloys. The article lists the recommended applications for alloys for parts and fixtures for various types of heat treating furnaces.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006014
EISBN: 978-1-62708-172-6
..., mill scale, rust, paint, oxides, corrosion products, and other foreign matter. Slight residues of rust and paint may be left in the lower portion of pits if the original surface is pitted. Cleaning shall retain or produce a surface profile of 25 μm (1 mil) minimum. SSPC-SP 15 “Commercial-Grade...
Abstract
This article reviews the various substrates for coatings, namely, steel, cast iron, galvanized steel, aluminum, stainless steel, nonferrous metals, concrete, and wood. General guidance for surface preparation and coating selection is provided along with unique requirements for the particular substrate(s).
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