7 Jun ASTM A states zinc-rich paint with zinc dust in the ranges of % or above 92% in the dried film are equally effective. Why is there a gap. ASTM A Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings details how to repair a damaged hot-dip galvanized coating . ASTM Designation: A (American Standard Testing Method). Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings.
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The videos provide highly beneficial visual aids to those needing assistance with touch-up and repair, whether in the plant or the field. Appropriate grinding tools include reciprocating sanders, orbital sanders, or grinding devices that utilize abrasive cloths, discs, wheels or flaps.
Although some of the requirements within ASTM A are relatively straightforward, other requirements related atm surface preparation often require clarification. Annex A3 describes the use of sprayed zinc.
Within the text of this specification and where appropriate, SI units are shown in brackets. Finally, a visual inspection to confirm the level of cleanliness must be carried out to ensure the standard is met.
When it comes to repairing galvanized steel in the field, there is no limitation to the size that can be repaired. Color red Pos 10 Your comments will receive careful consideration at a meeting of the responsible technical committee. Experience shows that in general. Zinc spray, or metallizing, is done by melting zinc powder or zinc wire in a flame or electric arc and projecting the molten zinc droplets by air or gas onto the surface to be coated.
The six-part video series will provide highly beneficial visual aids to those needing assistance with meeting the requirements of ASTM A Ensure a blotter test is performed prior to using a compressed air source in accordance with ASTM D Current edition approved May 1, Touch-up and repair of galvanized steel is simple whether newly galvanized or in service for years. To ensure that a smooth reconditioned coating can be effected, surface preparation shall extend into the undamaged galvanized coating.
Zinc-rich paint is applied to a clean, dry steel surface by either a brush or spray. asgm
Ensuring Conformance to ASTM A780
Annex A2 describes the use of paints containing zinc dust. Link to Active This link will always route to the current Active version of the standard. The specification explains axtm to use the various repair methods as well as the required coating thickness for the repaired area. Similarly, contracting parties shall agree to the repair method to be used.
ASTM A – Free Download PDF Ebook
Similarly, contracting parties shall agree to asm repair method to be used. Topics will include proper equipment and materials to use while performing the process, explanation of the specifications to follow, and examples of best practice during application of the repair materials.
Requirements concerning the renovation of uncoated areas remaining after initial hot-dip galvanizing are contained within the applicable material specification. The following general guidelines shall apply: This 7a80 can also be used to repair hot-dip galvanized coatings damaged by excessively rough handling during shipping or erection. Color red Pos 10 10 field service conditions include immersion. Zinc-based solder products closely match the surrounding zinc and blend in well with the existing coating appearance.
Experience shows that in general organic zinc-rich systems are more tolerant of surface preparation. Historical Version s – view previous versions of standard. Inch-pound units and SI units are not necessarily exact equivalents. Galv Touch-Up and Repair Dr. High Zinc Dust Content. Permission rights to photocopy the standard may also be secured from the ASTM website www.
Each system shall be used independently of the other without combining values in any way. Therefore, once in-field, any size of repairable coating defect can be touched up. Do not immediately apply repair materials over a freshly cleaned surface. Within the text of this specification and where aztm, SI units are shown in brackets. Paints containing zinc dust are classified as organic or inorganic, depending on the binder they contain. Where circumstances do not allow blast or power tool cleaning.
ASTM AZinc Dust in Paint | American Galvanizer’s Association
However, do not clean excessively beyond the area of repair. Most aastm zinc-rich paints are not critical of climatic or atmospheric conditions for curing. Topics include proper materials to use while performing the process, as well as specifications to follow and proper application of the repair materials. This practice describes the use of three types of material that possess the required properties for repair of damaged galvanized coatings, namely: Authored by Alana Hochstein.
Brite Atsm is an organic zinc compound. June 7, Author: Do not average the readings, as this requirement was removed from the specifications in Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone.
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Watch the Videos The main restriction in the specification for repairing newly galvanized material is the size of the area which is wstm in the product galvanizing specifications: ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
Asfm the paint as recommended by the paint manufacturer in a single application employing multiple spray passes to achieve a dry film thickness to be agreed upon between the contracting parties. This abstract is a brief summary of the referenced standard.