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chelating agents

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Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001266
EISBN: 978-1-62708-170-2
... —there is a growing interest in using sodium gold sulfite in the formulation of cyanide-free systems. Different reducing agents can also be used, and their activity influences both the rate of deposition and the stability of the bath. Other components of electroless gold baths include some chelating...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003010
EISBN: 978-1-62708-200-6
... curing and curing agents. The article provides descriptions of commercial product forms and the wide array of applications of thermosetting resins. It also tabulates the performance properties (mechanical, thermal, electrical and chemical resistance) of some families of unfilled or unreinforced...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001222
EISBN: 978-1-62708-170-2
.... Additives are organic or inorganic compounds that enhance cleaning or surface modification. Chemical compounds such as glycols, glycol ethers, corrosion inhibitors, and chelating agents should be considered additives. Glycols and glycol ethers are solvents that remove certain oily soils...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001226
EISBN: 978-1-62708-170-2
..., stainless steel Castings, Stampings, machined parts, drawn wire, diesel fuel injectors Chips, lubricants, light oxides High caustic with chelating agents Oil-quenched, used automotive parts; fine-mesh and sinterd filters Carbonized oil and grease, carbon smut, heavy grime deposits High caustic...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003213
EISBN: 978-1-62708-199-3
... Sodium lauryl sulfonate 5 … … … 5 … Napthalene sulfonate 2 … … 0.2 … … Additives are organic or inorganic compounds that enhance cleaning or surface modification. Chemical compounds such as glycols, glycol ethers, corrosion inhibitors, and chelating agents should be...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001307
EISBN: 978-1-62708-170-2
... chelating compounds. The main purpose of these agents is to solubilize the scale as much as possible. The performance of a particular chelating agent depends on the affinity of the compound for the metal ions present, the pH of the scale-conditioning solution, and the physical and chemical composition of...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001229
EISBN: 978-1-62708-170-2
..., lubricants, and carrier coatings. A buildup of such materials in a pickling bath interferes with the pickling action, especially when the pickling time is short (20 s or less). A typical alkaline cleaning solution contains 20% sodium hydroxide, 30% organic chelating agents, 45% complex phosphates, and 5...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003216
EISBN: 978-1-62708-199-3
..., cadmium, and zinc before electroless nickel can be applied Slower plating rate, as compared to electrolytic methods A copper source, which is a simple cupric salt such as copper sulfate, chloride, or nitrate A reducing agent, which is usually formaldehyde A complexing (or chelating...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001267
EISBN: 978-1-62708-170-2
... range from strong acid to strong base, depending on the metal system and the type of chelation and reducing agent being used. With some processes, a secondary reducer is used to increase the efficiency and quantity of alloying metal incorporated. The secondary metals that are being galvanically plated...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001253
EISBN: 978-1-62708-170-2
... one for a particular application. The traditional gold electroplating solution ( Table 1 ) for decorative use required: A source of gold A complexing agent for the gold A conducting salt to help carry the current and broaden the conditions of operation An alloying metal or metals for...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001265
EISBN: 978-1-62708-170-2
... about 4, the use of alkaline plating media necessitates use of a complexing, or chelating, component. Historically, complexing agents for electroless copper baths have almost always fallen into one of the following groups of compounds: Tartrate salts Alkanol amines, such as quadrol (N,N,N′,N...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001221
EISBN: 978-1-62708-170-2
... hydrogen embrittlement and base metal attack. Unless the acids used contain inhibiting agents, the acid treatments for surface preparation must be very mild and of short duration. If electrolysis is necessary, it should be used with anodic current. This is especially significant for spring-temper...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001256
EISBN: 978-1-62708-170-2
...-lead. Bismuth as an alloying agent prevents the whiskering and tin pest that can occur in tin coatings. Tin-nickel is used for corrosion-resistant coatings, especially in seawater environments. It has an attractive chromelike appearance and high lubricity when plated over bright nickel. Tin-zinc...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001309
EISBN: 978-1-62708-170-2
... hydroxide 10–20 10–15 Sodium polyphosphates 5–20 5–20 Sodium orthosilicate, sesquisilicate, metasilicate 30–50 30–50 Sodium carbonate, bicarbonate 0–25 0–25 Resin-type soaps 5–10 None Organic emulsifiers, wetting agents, chelating agents 2–10 1–3 Table 11 Suggested...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006629
EISBN: 978-1-62708-213-6
... the analytical signal. This mass measurement is made after the addition of a reagent that reacts completely with the analyte to form an isolable precipitate. This reagent is commonly referred to as the precipitating agent or simply the precipitant. The suitability of the precipitant is determined by...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006630
EISBN: 978-1-62708-213-6
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001306
EISBN: 978-1-62708-170-2
... comprised of a: Source of caustic to aid cleaning Chelating agent to detach scale or rust Complexing agent to hold relatively large amounts of iron in solution Electrolytic alkaline cleaning bath compositions and operating conditions are described in the article “Alkaline Cleaning” in this...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001262
EISBN: 978-1-62708-170-2
... required because the reversing current keeps the anode active and soluble. (b) The higher voltage of pulse plating relative to continuous dc plating favors the deposition of the alloying agent. The operator should analyze the deposits to determine if the amount of cobalt in the solution should be...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006636
EISBN: 978-1-62708-213-6
..., which contains uracil, toluene, ethylbenzene, quinizarin, and amitriptyline in methanol ( Ref 11 ). Uracil is used to indicate the dead time. Differences in the retention of toluene and ethylbenzene indicate hydrophobicity. Quinizarin is a metal-chelating agent; therefore, peak tailing indicates metal...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001308
EISBN: 978-1-62708-170-2
..., because oxide-coated surfaces free of oil or grease can be wetted uniformly. Also, a surface that has been processed with a detergent containing a wetting agent can be wetted even though not thoroughly clean, because the film of wetting agent remains on the unclean surface. Two other methods of testing...