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metallic contaminant removal

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280203
EISBN: 978-1-62708-267-9
... for superalloys and how they work. It discusses the effect of metallic contaminants, tarnish, oxide, and scale and how they can be detected and removed. It also discusses chemical and mechanical surface finishing techniques and where they are used, and presents several application examples. finishing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050173
EISBN: 978-1-62708-311-9
... Abstract The surface condition of metals can have a significant effect on the outcome of high-temperature processes and vice versa. This chapter discusses the general cleaning and surface treatment needs of work in-process both before and after induction hardening. It identifies contaminants...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480265
EISBN: 978-1-62708-318-8
... baths. After heavy scale removal, acid pickling is required to ensure removal of all scale and sub-surface contaminated metal. Rinsing and drying treatments also are included in cleaning operations. It is important to protect cleaned surfaces from airborne contamination prior to welding. Edges...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120085
EISBN: 978-1-62708-269-3
... a liability and a contaminant in postworking cleaning operations. The coatings are soluble and removable if the proper techniques are used. Protective coatings are applied to titanium surfaces during manufacturing operations for several reasons: To lubricate and aid in metal flow, good die...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030209
EISBN: 978-1-62708-282-2
... into the crude oil to dissolve salts (primarily chloride salts) for removal by separation of the water in the desalting vessel. Salt is a common contaminant in crude oil due to production and transportation processes. Removal of chloride salts is critical because they hydrolyze to form hydrochloric acid when...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1985
DOI: 10.31399/asm.tb.sagf.t63420027
EISBN: 978-1-62708-452-9
... the most complex. Atmosphere contamination consisting of oxidizing vapors and water vapors tends to oxidize freshly worn surfaces, to break down the oil chemistry, or to set up cells of corrosion on metal surfaces. Liquid contamination may consist of water (which may also be contaminated with gases, acids...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030172
EISBN: 978-1-62708-282-2
...-metal contamination, blast residues, flux inclusions, and galvanic attack. corrosion resistance magnesium alloys chemical composition heat treatment grain size cold working heavy-metal contamination blast residues flux inclusions galvanic attack MAGNESIUM AND MAGNESIUM ALLOYS...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720365
EISBN: 978-1-62708-305-8
... molds, or even the atmosphere itself if steps are not taken to prevent such contamination. The resulting hydrogen goes into solution at elevated temperatures; but as the metal solidifies after pouring, the solubility of hydrogen decreases, and it becomes entrapped in the metal lattice. Hydrogen...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310193
EISBN: 978-1-62708-286-0
... to a more soluble oxide without attacking the metal, making it more easily removed by subsequent pickling. Cleaning Stainless steel is very resistant to chemicals of many kinds, permitting it to be cleaned by many aggressive agents. Because contamination is on the surface of stainless rather than...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480207
EISBN: 978-1-62708-318-8
... temperatures practical. Titanium readily seizes and galls and requires thoroughly conditioned surfaces to remove any cracks or contamination that could propagate into the base metal on subsequent processing. In addition, anisotropy (the characteristic of exhibiting different values of a property in different...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.tb.atia.t59340063
EISBN: 978-1-62708-427-7
... in the process are silicon (from dirt), iron (from banding), and titanium (from white pigment on beverage containers). There are no feasible methods to remove these elements from molten aluminum, meaning that the only way to recycle dirty, unsorted scrap is to dilute the contaminants with pure metal, raising...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930353
EISBN: 978-1-62708-359-1
..., and tungsten. Tantalum Alloys Tantalum and its alloys have good weldability, provided the welds and the heated base metal are free from contamination. Carbon, oxygen, nitrogen, and hydrogen all actively react with tantalum, typically forming intermetallics that lead to weld embrittlement. Tantalum also...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050293
EISBN: 978-1-62708-311-9
... for testing at least once a year to make certain that there has been no deterioration. The five basic causes of contamination in water and polymer quench systems are: Solids contamination , comprising scale and metal particles that collect in the quench tank, should be removed on a continuous basis...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270197
EISBN: 978-1-62708-301-0
... Abstract One of the rotor bearings in an electric motor failed, producing excessive vibrate. The bearing was removed and disassembled, revealing craters and bruises on the inner ring raceway and balls along with evidence of melting and burning of metal. Scanning electron microscopy revealed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430379
EISBN: 978-1-62708-253-2
... pressure, the more critical becomes the removal of impurities from the water. The purity of potable water available for domestic use is far below that required for use in boilers as boiler feedwater (BFW). It is therefore essential to reduce the level of contaminants present in raw water and to add certain...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000023
EISBN: 978-1-62708-312-6
... the melt from excessive oxidation. A low manganese content, essential for controlling oxidation during atomization, also keeps the slag from becoming too fluid. Just prior to pouring, the slag is removed and the liquid metal is poured, via a runner, into a preheated tundish. Care must be taken, especially...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120065
EISBN: 978-1-62708-269-3
.... An acetone-soaked, lint-free cloth serves to remove surface contamination caused by the die lubricant used in the wire drawing operation, in addition to cleaning the filler wire. Pickling in nitric-hydrofluoric acid solution is also used for cleaning. If the iron content of weld metal is above about 0.05...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140047
EISBN: 978-1-62708-335-5
... and, in the latter case, affects the efficiency of hydrogen removal. Moisture in any form: contamination on tools, flux tubes, ingot, scrap, metallurgical metals, grain refiners, and master alloys that may be added to the heat additively affect dissolved hydrogen content up to the applicable solubility limit...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2022
DOI: 10.31399/asm.tb.tstap.t56040030
EISBN: 978-1-62708-428-4
..., it is important not to induce too much stress during the sectioning and mounting steps. This may be achieved by use of appropriate cutting wheels, ideally a metal-bonded diamond wheel; these provide rapid and effective material removal with less force and heating generated in the surrounding material, which may...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930057
EISBN: 978-1-62708-359-1
... that result from improper gas-tungsten arc welding procedures Backing piece left on: Failure to remove material placed at the root of a weld joint to support molten weld metal Shrinkage voids: Cavity-type discontinuities normally formed by shrinkage during solidification Oxide inclusions...