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chemical treatment

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Published: 01 December 2015
Fig. 2 Real-time monitoring of chemical injection in a cooling-water system with online corrosion rate and pitting tendencies (localization index). October 10—Chemical treatment program transition: Inhibitor was turned off, acid addition was stopped, blowdown was increased, and dispersant More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430343
EISBN: 978-1-62708-253-2
..., but essentially covers control of parameters such as dissolved oxygen level, total iron and copper content of water, pH and hardness of water, oils and resins, and other chemicals used in boiler water treatment. Failure to control these parameters can result in tube failure by these mechanisms. For example...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430379
EISBN: 978-1-62708-253-2
... of controlling the water chemistry through water treatment programs are: To generate high-purity steam To minimize corrosion and scale formation To increase boiler efficiency and reduce plant downtime To save fuel, water, chemicals, and additives To increase the life of plant equipment...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030167
EISBN: 978-1-62708-282-2
... of metallic materials can be influenced greatly by alloying, metallurgical treatments, and mechanical treatments. The following articles consider methods of preventing corrosion based on these factors, as applicable, for a number of technologically important alloy systems. Alloying Chemical composition...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.tb.atia.t59340117
EISBN: 978-1-62708-427-7
... or alkali), and chemical treatment to coating with a lacquer, oil, or paint ( Ref 6.6 ). In most cases, a combination of these operations is required to produce a long-lasting surface from a mill finish sheet. Several different chemical treatment options are available, depending upon the desired surface...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1996
DOI: 10.31399/asm.tb.phtpclas.t64560205
EISBN: 978-1-62708-353-9
... Abstract Austenitization is the heat treatment of steel in the austenite region, and it is conducted for two reasons. One is to obtain austenite as a necessary precursor for heat treatment, and this is the main emphasis of this chapter. The other is to chemically homogenize steel, so...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300335
EISBN: 978-1-62708-323-2
... Abstract This chapter covers coatings and treatments that are used to improve the friction and wear behaviors of materials. It describes modifications that work by hardening contacting surfaces, including heat treating, vacuum coating, thermal spray, and plating, and those that separate...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120039
EISBN: 978-1-62708-269-3
... Abstract Titanium castings are used in a wide range of aerospace, chemical process, marine, biomedical, and automotive applications. This chapter provides an overview of titanium casting and associated processes and how they compare with other manufacturing methods. It also discusses the role...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270113
EISBN: 978-1-62708-301-0
.... Based on visual examination, SEM fractography, and chemical analysis, investigators concluded that the hinge pins were not made from the specified steel and were not properly treated after cadmium plating. The pins failed due to hydrogen embrittlement, which may have been aggravated by welding...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350195
EISBN: 978-1-62708-315-7
.... Heat Treatment to Avoid Hydrogen Embrittlement With most of the electroplating processes, and in particular cadmium and hard chromium plating, and some of the chemical processes including electroless nickel, there is a risk of hydrogen embrittlement of high-strength steel components...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350001
EISBN: 978-1-62708-315-7
... , these properties can be enhanced metallurgically, mechanically, chemically, or by adding a coating. Surface engineering options and property benefits Table 1 Surface engineering options and property benefits Surface treatment/coating type Primary property benefits Changing the surface metallurgy...
Image
Published: 31 December 2020
Fig. 14 Comparison of the level of stress distribution in two steels of similar chemical composition but different grain size, after identical heal treatments. Internal stresses are considerably greater in the coarse-grained steel (b). More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140061
EISBN: 978-1-62708-335-5
... Abstract The metallurgy of aluminum and its alloys offers a range of opportunities for employing heat treatments to obtain desirable combinations of mechanical and physical properties such that castings meet defined temper requirements. This chapter discusses the processes involved in solution...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220273
EISBN: 978-1-62708-259-4
... CCT curve. The “isothermal” cycle is the most commonly used. For steels in which diffusive decomposition of austenite is too slow, the “continuous cooling” heat treatment leads to good results in shorter times. Source: Ref 13 There are also sources of hydrogen after steelmaking: chemical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410091
EISBN: 978-1-62708-280-8
... Abstract This chapter is a collection of tables listing: cast alloy designations of Aluminum Association, along with their general applications; the chemical compositions of the frequently used alloys for gravity permanent molds, low-pressure permanent molds, squeeze castings, and die castings...
Image
Published: 01 August 2018
Fig. 13.3 (a) During treatment in the critical region of dual-phase and multiphase steels, carbon enriched austenite is formed (figure shows the equilibrium condition for a Fe-C alloy). (b) On cooling, austenite transforms partially to martensite. Depending on its chemical composition, some More
Image
Published: 01 August 2018
Fig. 17.107 Malleable cast iron, as cast (before the malleabilization heat treatment). The region close to the surface (to the right of the image) shows the formation of graphite due either to deviation in chemical composition or changes caused by the mold material. Courtesy of J. Sertucha More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1996
DOI: 10.31399/asm.tb.phtpclas.t64560001
EISBN: 978-1-62708-353-9
... Abstract This chapter provides information on the selection of steel and the design of its heat treatment. It also discusses the purpose of this book. heat treatment steel The materials used in components are now highly diversified, with many applications historically reserved...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220519
EISBN: 978-1-62708-259-4
... compositions and the heat treatment conditions are carefully adjusted to guarantee very fine pearlite in the rim region, as shown in Fig. 15.30 and 15.31 . Fig. 15.30 Railway wheel. Steel has a chemical composition very close to the eutectoid. Close to the tread, (a) deformed fine pearlite, (b...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030165
EISBN: 978-1-62708-282-2
... behavior of metals is their chemical composition. Alloying, which is adding other element(s) to a metal, is one of the major means used to improve the corrosion resistance of the base material. Alloys with varying degrees of corrosion resistance have been developed in response to an ever-increasing number...