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hard coatings

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Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006012
EISBN: 978-1-62708-172-6
.... Silicon and many metals, including aluminum and chromium, are spontaneously coated upon exposure to air with a nanoscale oxide layer that is hard and virtually impermeable to oxygen and water. Such nanofilms are very important and can greatly influence the properties, including corrosion resistance, of...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003833
EISBN: 978-1-62708-183-2
... information on duplex coatings and applications of chromium electrodeposits. chromium plating corrosion corrosion resistance duplex coatings electroplating chromium electrodeposits posttreatment HARD CHROMIUM plated parts have chromium coatings more than approximately 1.2 μm (0.05 mil) thick...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001243
EISBN: 978-1-62708-170-2
... on the removal of chromium plate from coated metals, recovery and disposal of wastes, and stopoff media for selective plating. crack pattern electrodeposition hard chromium plating hydrogen embrittlement plate hardness plating equipment plating solutions process control safety...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001278
EISBN: 978-1-62708-170-2
... ) usually gives adequate flexibility, but the coatings are soft and do not possess good tensile strength. By raising the T g of the acrylic polymer to improve hardness, the coating becomes too brittle to be useful over flexible substrates. Usually a modification is required that involves introducing some...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006046
EISBN: 978-1-62708-172-6
.... These coatings have excellent resistance to solvents, acids, and salt solutions. They can be used continuously at a temperature of 150 °C (300 °F) and can withstand brief exposures to dry heat of up to 370 °C (700 °F). They should be kept out of contact with strong alkalis. The coatings are hard with...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001300
EISBN: 978-1-62708-170-2
... covered, and a texture will develop in the film. Slight misorientations between the grains lead to the need for misfit dislocations at boundaries. This is the reason for the high dislocation densities associated with coatings deposited under inhibited conditions. The microstructure of hard electrodeposits...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001282
EISBN: 978-1-62708-170-2
... surface being coated. It is considered by some to be a welding process akin to hard facing rather than a true thermal spray process, because the surface of the substrate becomes momentarily molten immediately beneath the torch. A major advantage of the thermal spray processes is the extremely wide...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006044
EISBN: 978-1-62708-172-6
... hardness as a consequence of its high T g , higher gloss because of its higher refractive index, and water resistance because of its hydrophobicity, but its aromatic nature can negatively affect ultraviolet (UV) resistance and exterior durability. It is widely used in industrial coatings for its gloss...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006038
EISBN: 978-1-62708-172-6
... hard objects. Pipeline coating systems exhibit a broad range of physical characteristics. They can be hard or relatively soft; they can be thick or thin; they can contain single or multiple layers. Regardless of these characteristics, all coating system configurations are prone to some form of...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006036
EISBN: 978-1-62708-172-6
... polyisocyanate crosslinkers (e.g., the trimer of HDI) are hard, color stable, weather resistant, and abrasion resistant—all good characteristics for use as a topcoat in a corrosion-resistant coating system on steel. While the cost of polyaspartic topcoats is generally higher than other common topcoats (e.g...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001270
EISBN: 978-1-62708-170-2
... formability. Low-alloy grades are also galvanized to meet the requirements of specific applications. Table 4 Typical mechanical properties of continuous hot-dip-coated steel sheet Grade Yield strength Tensile strength Elongation in 5 cm (2 in.), % MPa ksi MPa ksi Full hard 620 90...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001296
EISBN: 978-1-62708-170-2
... ), as well as in other review books and articles ( Ref 2 , 3 , 4 , 5 ). The behavior of nitride hard coatings deposited by physical vapor deposition or chemical vapor deposition is summarized in Ref 6 . Because corrosion of metals is an electrochemical process...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001280
EISBN: 978-1-62708-170-2
... coatings deposited by three processes Coating material Hardness of coating, HV Flame sprayed Plasma sprayed Detonation gun sprayed Tungsten carbide + 8% cobalt … 600–700 1200–1450 Tungsten carbide + 12% cobalt … 600–700 1050–1200 Chromium oxide 900–1100 1200–1350 900–1150...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006037
EISBN: 978-1-62708-172-6
... life-cycle cost is low). The market for polymeric floor coatings, categorized as “hard surface flooring—other nonresilient flooring,” was estimated at $950 million in the United States in 2012 ( Ref 1 ), approximately 10% of the $10 billion hard surface flooring market, which includes vinyl, linoleum...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006011
EISBN: 978-1-62708-172-6
... makes it possible to create polyurethane coatings with specific targeted properties, such as dry time, solvent content, gloss level, flexibility, hardness, as well as chemical and weather resistance. Several common types of polyols used in the creation of polyurethane coatings include polyester...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001298
EISBN: 978-1-62708-170-2
... carbide drills is recommended for producing a hole in a ductile coating. Abrasive-jet drilling is recommended for a brittle, hard coating ( Ref 24 ). The use of specially made hole-drilling strain-gage rosettes is essential. The application of the strain-gage should follow the procedure recommended by...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006047
EISBN: 978-1-62708-172-6
... unique viability in certain applications, and some recent use has been noted. The resin blend component of an aromatic-based polyurea system is the more complex component of the system. The resin blend uses soft-block and hard-block segments for the reactive constituents. The soft-block segments are...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003844
EISBN: 978-1-62708-183-2
..., chemically resistant coatings are cross-linked thermosets, including epoxies, polyurethanes, and alkyds. For a cross-linked thermoset, additional exposure to increasing temperature changes the material from a relatively hard, glossy molecular structure to a softer, rubbery structure. The temperature at...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001316
EISBN: 978-1-62708-170-2
... edges or any holes present during firing. The second group of properties are those associated with the use of the product, such as appearance, smoothness, porosity, and corrosion resistance to various liquids and gases. Almost all vitreous coatings are expected to be homogeneous, smooth, and hard and...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006049
EISBN: 978-1-62708-172-6
..., the coating will “set up or air-dry, so to speak, in a reasonably short length of time to form a tightly adhering, hard, tough, semipermeable coating which protects the ferrous surface against attack in a highly corrosive atmosphere by the process of selective galvanic action.” This invention launched...