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chromate-free conversion coating

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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
... the electrochemical impedance spectroscopy approach used for evaluating conversion coatings. The test methods for various CCCs properties are also reviewed. The article examines the various coatings associated with chromate-free conversion. These include: titanium and zirconium fluorocomplexes; cerium-base, manganese...
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
...: GalvInfo Center Abstract 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...
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 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...
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
... ). (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 and automotive components. However, they are relatively soft and can be used for corrosion...
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
...) to steel. This is also evidenced by Fig. 1 . Such coatings on steel are therefore expected to act strictly as barriers to prevent corrosion of the steel substrate. For this to be successful, the coatings must be pore free and flaw free. It is very difficult to obtain impervious coatings of more noble...
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 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...
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
..., such as the iridescent or colored films formed during heat treating. This acid mixture cleans and imparts a slightly etched appearance to the surface, preparing it for painting, caustic etching, conversion coating, or anodizing. Nonpolluting, proprietary products free of chromic acid are available for acid cleaning...
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 Chromate-Free Coatings , Corrosion , Vol 59 ( No. 5 ), 2003 p 379 – 400 10.5006/1.3277570 14. “Chemical Conversion Materials for Coating Aluminum and Aluminum Alloys,” MIL-DTL-81706 (Rev B), Oct 2004 15. Haaksma R.A. and Weir J.R. , Proc. 27th Int. SAMPE...
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
...). If there is an interruption of the process, the procedure should restart at the etching step. One approach for the precoating 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...
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
... alloy 1100. Specimens were immersed in neutral deaerated NaCl solution free of cathodic reactant. Pitting develops only at potentials more cathodic than the pitting potential, E p . The intersection of the anodic curve for aluminum (solid line) with a curve for the applicable cathodic reaction (one...
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: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001304
EISBN: 978-1-62708-170-2
... 2,754 3.5 Tin-free steel 904 1.1 964 1.2 Tin-coated sheets 78 0.1 74 0.1 Sheets  Hot rolled 13,361 1.62 13,161 16.7  Cold rolled 12,692 15.4 11,532 14.6 Sheets and strip  Galvanized-hot dipped 8,199 10.0 6,910 8.8  Electrolytic 2,390 2.9 2,099 2.7...
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
... objective. 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...
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
..., 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. The slurry dumps onto a vibrating screen or magnetic...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003820
EISBN: 978-1-62708-183-2
... gray to beige Negligible Paint base for mild environments when applied to high-purity alloys; provides option of a chromium-free treatment (2) Deoxylite 41 (optional) Dilute chromate; NH35 2.5 g NaHF 2 , 2.5 g Na 2 Cr 2 O 7 ·2H 2 O, 3 g MgSO 4 ·7H 2 O, 32 mL 65% HNO 3 , to 2 L H 2 O Clean...
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
... as the accelerator. Zinc phosphating baths for aluminum usually contain complex or free fluorides to accelerate coating formation and to block the coating-inhibiting effect of soluble aluminum. Accelerators used in phosphate coating processes Table 2 Accelerators used in phosphate coating processes Type...