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chromate-free conversion coatings

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Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003679
EISBN: 978-1-62708-182-5
... reviewed. The article examines the various coatings associated with chromate-free conversion. These include: titanium and zirconium fluorocomplexes; cerium-base, manganese-base, cobalt-base, and molybdate-base conversion coatings; hydrotalcite coatings; and organic coatings. References References 1...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006027
EISBN: 978-1-62708-172-6
... Abstract This article provides a brief discussion on the common types of overlayers that can be used on a metal surface to protect it from corrosion. These overlayers include phosphate, chromate, and chromate-free conversion coatings; hot dip galvanizing; cementitious linings; glass...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006521
EISBN: 978-1-62708-207-5
... Abstract Chemical conversion coatings are adherent surface layers of low-solubility oxide, phosphate, chromate, and chromate-free compounds produced by the reaction of suitable reagents with the metallic surface. This article provides an overview on chromate-free coatings, along with coverage...
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
... Conversion Coatings” and “Chromate and Chromate-Free Conversion Coatings” in Volume 13A. Black sulfide coatings on stainless steel and naphthanate coatings on wood are also conversion-coating processes. The black oxide and phosphate coatings are generally used with a supplemental treatment of oil, wax...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003674
EISBN: 978-1-62708-182-5
..., phosphates, and other chemicals. Such films greatly improve paint adhesion ( Ref 1 ). (See the article “Chromate and Chromate-Free Conversion Coatings” in this Volume.) The films, which contain chromates, have corrosion-preventive properties in their own right and are used on some aircraft...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001275
EISBN: 978-1-62708-170-2
... Abstract This article briefly describes the basic attributes of chromate conversion coatings and the processes for applying them. It provides information on the influence of substrate microstructure on the performance of coating deposits and on the mechanism of substrate protection supplied...
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
... surface with water, known as the water break test, does not always provide an indication of cleanliness if oxides are of concern, 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...
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
... M.W. and Buchheit R.G. , Corrosion Inhibition of Aluminum and Aluminum Alloys by Soluble Chromates, Chromate Coatings, and Chromate-Free Coatings , Corrosion , Vol 59 ( No. 5 ), 2003 p 379 – 400 10.5006/1.3277570 14. “Chemical Conversion Materials for Coating Aluminum...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003827
EISBN: 978-1-62708-183-2
... preparation is detailed as follows. Other approaches can be used if they accomplish the goal of a clean, oxide-free surface capable of being coated. Degreasing is performed to remove organic contaminants. A common problem is incomplete removal of the marking or layout ink used by the machinist...
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006546
EISBN: 978-1-62708-210-5
..., are used to form a more uniform and thicker oxide for enhanced corrosion protection. Chemical conversion coatings produce a porous and absorptive oxide (0.05 to 0.08 mm, or 0.002 to 0.003 in., thick) that is very uniform and morphologically tailored to bond well with paint primers. The oxides are chromate...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004125
EISBN: 978-1-62708-184-9
...-film thickness of 15 to 24 μm (0.6 to 0.9 mil). The coating is tack-free within 1 to 5 h and dry-hard within 6 to 8 h. For corrosion-prone areas, the primer may be applied up to double this thickness. If a topcoat is to be applied, it is usually accomplished within the tack-free to dry-hard time period...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003687
EISBN: 978-1-62708-182-5
... in potential to the substrate in moist environments, because few coatings are completely free of pores, cracks, and other defects. Even if a coating does start out defect free, scratching, normal wear, or gouging can change this condition. Accordingly, in a corrosive environment, plated components present...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001304
EISBN: 978-1-62708-170-2
... steel chromate conversion coatings chromium plating cleaning conversion coatings electrochemical finishing electrogalvanizing electroless nickel plating electroplating finishing hardfacing heat treatment high-strength low-alloy steel hot dip coatings ion implantation laser surface...
Book Chapter

By A. Sato
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001248
EISBN: 978-1-62708-170-2
.... Electroplated zinc without subsequent treatment becomes dull gray in appearance after exposure to air. Bright zinc that has been subsequently given a chromate conversion coating or a coating of clear lacquer (or both) is sometimes used as a decorative finish. Such a finish, although less durable than heavy...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003217
EISBN: 978-1-62708-199-3
... lead and no spangle. As a result, they are free of spangle cracking, and the coatings have better resistance to cracking during forming than does ordinary spangled galvanized. Hot-Dip Aluminum-Zinc Coatings Aluminum-zinc alloy coatings of steel sheet and wire are applied on continuous hot-dip...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003678
EISBN: 978-1-62708-182-5
...Characteristics of different types of phosphate coatings and associated processes (general formulas) Table 1 Characteristics of different types of phosphate coatings and associated processes (general formulas) Free acid is defined as the number of mL of 0.1 M NaOH required to reach...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003217
EISBN: 978-1-62708-199-3
... on intergranular corrosion and paint adhesion. The eutectic coatings generally have no added lead and no spangle. As a result, they are free of spangle cracking, and the coatings have better resistance to cracking during forming than does ordinary spangled galvanized. Aluminum-zinc alloy coatings...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001268
EISBN: 978-1-62708-170-2
... about 45 min. At the conclusion of the cycle, the slurry of glass beads, coated parts, and water discharges into a vibrating surge hopper under the plating barrel. The capacity of this hopper should be large enough to accept the entire load, thereby freeing the barrel to begin plating the next load...
Book Chapter

Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001274
EISBN: 978-1-62708-170-2
... for aluminum usually contain complex or free fluorides to accelerate coating formation and to block the coating-inhibiting effect of soluble aluminum. Table 2 Accelerators used in phosphate coating processes Type of accelerator Accelerator source Effective concentration Optimum operating...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003221
EISBN: 978-1-62708-199-3
... in the order of increasing corrosiveness: (a) oil immersion, (b) indoor, (c) rural, (d) industrial, and (e) marine. Magnesium alloys are afforded increasing protection in the following order: (a) bare, (b) pickled, (c) chromate conversion coated, (d) anodized, (e) electroplated, and (f) coated with organic...