What is ASTM B695?
The ASTM B695 specification covers the requirements for a coating of zinc mechanically deposited on iron and steel basis metals. The coating is provided in several thicknesses up to and including 107μm. The seven thickest classes are usually referred to as “mechanically galvanized”.
What is ASTM A153?
ASTM A153 governs zinc coatings applied by the hot-dip process to hardware products such as castings, fasteners, rolled, pressed, and forged products, and miscellaneous threaded objects that will be centrifuged, spun, or otherwise handled to remove excess zinc.
What is mechanical zinc plating?
Mechanical zinc plating is accomplished by tumbling small parts in a drum with zinc and proprietary chemicals. During tumbling, the glass beads peen zinc powder onto the part. Once finished, the parts are dried and packaged, or post-treated with a passivation film, dried, and packaged.
What is mechanical galvanizing?
Mechanical galvanizing (ASTM B695) is a process in which fasteners are tumbled in a barrel with a mixture of water, zinc powder, other chemicals, and glass impact beads. As the parts are tumbled in the slurry, the zinc is “cold welded” to the fasteners.
What is the difference between ASTM A123 and A153?
ASTM A153 is the hot-dip galvanizing specification for hardware and fasteners that are spun or otherwise handled (torch and steel brush) after galvanizing to remove excess zinc. ASTM A123 is the hot-dip galvanizing specification for most other items (except single reinforcing bars).
What is the thickness of hot dip galvanizing coating?
Typical galvanized coatings range from 3-8 mils (75-200 mi- crons) thick. When designing and detailing tapped holes, the increased thickness is important.
What is meant by electroless plating?
Electroless plating, also known as chemical or auto-catalytic plating, is a non-galvanic plating method that involves several simultaneous reactions in an aqueous solution, which occur without the use of external electrical power. It is mainly different from electroplating by not using external electrical power.
What is meant by Sherardizing?
Sherardizing, means of forming a uniform, corrosion-resistant coating of zinc on the surface of iron or steel objects. The process, practiced since about 1900, is named for its English inventor Sherard O.
What is the difference between hot dip galvanizing and zinc plating?
Hot-dip galvanizing is a process of applying a protective zinc coating by dipping product in bath of molten zinc. Zinc plating or electroplating is a process where zinc is applied by using a current of electricity. It is a thinner coating than hot-dip galvanizing making it unsuitable for outdoor applications.
How thick is G90 galvanizing?
about 0.76 mils
The standard product is Class G90, which has 0.9 oz/ ft2 of sheet (total both sides) or about 0.76 mils (18 µm) thickness per side. Batch galvanizing coating specifications are given in weight per surface area.
Is Galvanising a coating?
Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.
What kind of coating is required for ASTM b695?
ASTM B695. The ASTM B695 specification covers the requirements for a coating of zinc mechanically deposited on iron and steel basis metals. The coating is provided in several thicknesses up to and including 107μm. The seven thickest classes are usually referred to as “mechanically galvanized”.
What does an ASTM designation number stand for?
An ASTM designation number identifies a unique version of an ASTM standard. Active Standard ASTM B695 | Developed by Subcommittee: B08.06 Book of Standards Volume: 02.05 This specification covers the requirements for zinc coatings that are mechanically deposited on iron or steel basis metals.
What is the ASTM specification for zinc coating on iron and steel?
A153/A153M Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware A194/A194M Specification for Carbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both