ASTM D4417-03

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D4417 – 03
Standard Test Methods for
Field Measurement of Surface Profile of Blast Cleaned
1
Steel
This standard is issued under the fixed designation D4417; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope instruments described are readily portable and sufficiently
sturdy for use in the field.
1.1 These test methods cover the description of techniques
for measuring the profile of abrasive blast cleaned surfaces in
NOTE 1—Optical microscope methods serve as a referee method for
the laboratory, field, or in the fabricating shop. There are
surface profile measurement. Profile depth designations are based on the
concept of mean maximum profile ( h¯ max); this value is determined by
additionaltechniquessuitableforlaboratoryusenotcoveredby
averagingagivennumber(usually20)ofthehighestpeaktolowestvalley
these test methods.
measurements made in the field of view of a standard measuring
1.2 The values stated in SI units are to be regarded as the
microscope. This is done because of evidence that coatings performance
standard. The values given in parentheses are for information
in any one small area is primarily influenced by the highest surface
only. 2
features in that area and not by the average roughness.
1.3 This standard does not purport to address all of the
4. Apparatus
safety concerns, if any, associated with its use. It is the
responsibility of whoever uses this standard to consult and
4.1 MethodA—Aprofilecomparatorconsistingofanumber
establish appropriate safety and health practices and deter-
of areas (each approximately one square inch in size), usually
mine the applicability of regulatory limitations prior to use.
side by side, with a different profile or anchor pattern depth.
Each area is marked giving the nominal profile depth in mils or
2. Summary of Test Method
micrometres. Typical comparator surfaces are prepared with
2.1 The methods are:
steel shot, steel grit, or sand or other nonmetallic abrasive,
2.1.1 Method A—The blasted surface is visually compared
since the appearance of the profile created by these abrasives
to standards prepared with various surface profile depths and
may differ. The comparator areas are used with or without
the range determined.
magnification of 5 to 10 power.
3
2.1.2 Method B—The depth of profile is measured using a
4.2 Method B—Adial gage depth micrometer fitted with a
fine pointed probe at a number of locations and the arithmetic
pointed probe. The probe is machined at a 60° angle with a
mean determined.
nominal radius of 50 µm. The base of the instrument rests on
2.1.3 Method C—Acomposite plastic tape is impressed into
the tops of the peaks of the surface profile while the spring
theblastcleanedsurfaceformingareverseimageoftheprofile,
loaded tip projects into the valleys.
4
and the maximum peak to valley distance measured with a
4.3 Method C—A special tape containing a compressible
micrometer.
foam attached to a noncompressible uniform plastic film. A
3. Significance and Use
2
John D. Keane, Joseph A. Bruno, Jr., Raymond E. F. Weaver, “Surface Profile
3.1 The height of surface profile has been shown to be a
for Anti-Corrosion Paints,” Oct. 25, 1976, Steel Structures Painting Council, 4400
factor in the performance of various coatings applied to steel. Fifth Ave., Pittsburgh, PA 15213.
3
The sole source of supply of suitable depth micrometers known to the
For this reason, surface profile should be measured prior to
committee at this time is the surface profile gage, Model 123, Elcometer Instru-
coating application to ensure that it meets that specified. The
ments, Ltd., Edge Lane, Droylston, Manchester M35 6UB, United Kingdom,
England. If you are aware of alternative suppliers, please proved this information to
ASTM International Headquarters. Your comments will receive careful consider-
1 1
These test methods are under the jurisdiction of ASTM Committee D01 on ation at a meeting of the responsible technical committee, which you may attend.
4
Paint and Related Coatings, Materials, and Applications and are the direct The sole source of supply of suitable replica tape, Press-O-Film, known to the
responsibility of Subcommittee D01.46 on Industrial Protective Coatings. committee at this time is Testex. 8 Fox Lane, Newark, DE 19711. If you are aware
Current edition approved May 10, 2003. Published June 2003. Originally of alternative suppliers, please proved this information to ASTM International
approved in 1984. Last previous edition approved in 1999 as D4417 – 93 (1999). Headquarters.Your
...