This document specifies requirements for non-electrolytically applied zinc flake coating systems for steel fasteners. Galvanic coating processes and pickling with acids have a major influence on the development of hydrogen-induced brittle fractures. American Petroleum Institute. Synapse Information Resources, Inc.
It is not applicable to mechanically applied zinc coatings. The requirements of the automotive industry have set new objectives.
ISO - Fasteners -- Non-electrolytically applied zinc flake coatings
World Scientific Publishing Co. Trans Tech Publications Inc. Vocational Education Strengthening Project. They may be similarly applied to steel fasteners with other types of thread. All normative documents are subject to revision.
Other product dimensions apply only before coating. More From Permeshwara Nand Bhatt.
Aerospace Industries Association. If cleaning methods are applied which could lead to hydrogen absorption such as cleaning.
Ananias Alexandre Emmerick. The coating may or may not contain chromate.
As zinc flake coatings do not create any hydrogen in the process, they were used for critical applications as an alternative to electroplating. General It is a characteristic df this type of coating that no hydrogen which could be absorbed by the parts is generated during the coating process. International Organization for Standardization. After the curing, a uniform, thin, firmly bonded and dry layer is produced. This requirement applies to bolts.
Zinc flake coating
Dunedin Academic Press Ltd. No zinc flake coatings used in the automotive industry nowadays contain this substance.
Steel parts that can be coated with zinc flake coatings include, for example, bolts, nuts, springs, panels and structural parts. The coated fastener shall be free from blisters, localized excess coating and uncoated areas which may have adverse effects on corrosion protection and fitness for use. This document does not specify requirements for such fastener properties as weldability or paintability. These coatings consist of a mixture of zinc and aluminium flakes, which are bonded together by an inorganic matrix.
If required, re-lubrication or a thread lock patch is also possible. If applies to both coating with of without chromate. After the pre-treatment then comes the coating process. In contrast to paints where the risk of sub-surface corrosion creep exists, this phenomenon is avoided through the sacrificial effect of the zinc.
Neither process produces any hydrogen, so there is no danger of any hydrogen embrittlement when pre-treating high-strength steels in this way. Corrosion prevention Zinc. Society of Allied Weight Engineers, Inc. Standards Australia International, Ltd. Combined with cured, thin, organic or inorganic coatings, these can also provide colour black, silver, green, blue, etc.
Deutsches Institut fur Normung E. Detail Summary View all details.
Association Connecting Electronics Industries. Construction Specifications Institute, Inc. Currency display settings. Builders Hardware Manufacturers Association, Inc. Telecommunications Industry Association.
Special techniques may be necessary to avoid excess coating or uncoated areas with parts such as washers. Springer-Verlag New York, Inc. Mounted on a rack the parts get sprayed with the zinc flake material spraying process or, placed inside a container, they get dipped and spun dip-spinning. Small amounts of the coating material sticking on the tape are acceptable.
ISO - Fasteners -- Non-electrolytically applied zinc flake coating systems
Various manufacturers, such as car companies and their suppliers, movie malaysia have produced their own specifications and supply rules in order to define the requirements for these coating systems. Steel can be protected in this way. International Electrotechnical Commission.
The typical cleaning processes are removal with an alkaline aqueous solution and then blasting with very small steel balls shot. For undated references, the latest edition of the normative document referred to applies. View Full Details and Buy. Mary Charmaine Divinagracia.
The coated parts have to be cured inside an oven at a controlled temperature for a set period. From Wikipedia, the free encyclopedia.
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