ASTM D – 11 Standard Test Methods for Field Measurement of Surface Profile of Blast – Download as PDF File .pdf), Text File .txt) or read. 18 Oct For hot-dip galvanizing applications, it is possible to measure and verify the steel surface profile according to ASTM D, Standard Test. 1 Jan ASTM D Standard Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel.
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The standard does not address discarding outliers, but an update to the standard addressing outlier readings is planned.
Updates to ASTM D4417
Today, Method B and Method C are the most commonly used, so that is what we will be focusing on. Work Item s – proposed revisions of this standard. This is done because of evidence that coatings performance in any one small area is primarily influenced by the highest surface features in that area and not by the average roughness. According to ASTM D, a minimum of 2 readings is obtained per area; the average of the two readings is reported.
Only the use of surface profile depth micrometers and replica tape were updated, and the specification changes are as follows: Then determine the mean for all the locations and report it as the profile of the surface. Larger repair areas or prepared hot-dip galvanized surfaces for painting can be measured with 10 readings taken from a minimum of three, 6×6 inch 15×15 cm areas.
This movement may be caused by expansion and contraction of the substrate due to temperature fluctuation, or live loads placed onto a structure; for example, traffic crossing a bridge.
It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Anyone making use of this information assumes all liability arising from such use. Originally approved in The depth is displayed on the gage in mils 0. Each area is marked giving the nominal profile depth in mils or micrometres. Surface Profile Depth Micrometer – It is now required atsm the maximum individual reading of 10 or more surface profile readings per area are to be reported, rather than taking the average of ten readings ast, area.
Permission rights to photocopy the standard may also be secured from the ASTM website www.
For this reason, surface profile should be measured prior to coating application to ensure that it meets that specified. When using magnification, the magnifier should be brought into intimate contact with the standard, and the depth of focus must be sufficient for the standard and surface to be in focus simultaneously.
This method can be used to measure the surface profile depth that is created by abrasive blast cleaning or impact-type power tools. Peak density the number of peaks per unit area also plays a key role in maintaining adhesion of the coating system and provides greater resistance to corrosion undercutting when the coating system gets damaged while in service.
Same Surface, Different Results? Your comments will receive careful asm at a meeting of the responsible technical committee, which you may attend. The information axtm herein is not intended awtm a representation or warranty on the part of the AGA.
This can be done with the unaided eye, under 5 to 10 power magnification, or by touch.
Updates to ASTM D | American Galvanizer’s Association
ICS Number Code x Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Standards for Measurement of Surface Profile There are currently four primary standards for measurement of surface profile in steel surfaces. The creation of this peak-valley pattern in the surface effectively increases the surface area, providing an anchor for the coating system. Size px x x x x For more information related to surface preparation as it relates to hot-dip galvanized steel, you can contact AGA Corrosion Engineer Alana Hochstein at ahochstein galvanizeit. Please help us to share our service with your friends.
There are currently four primary standards for measurement of surface profile in steel surfaces.