ASTM A1117-23

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A1117 − 23
Standard Practice for
Application of Thermal Spray Aluminum (TSA) Coating to
Carbon Steel Pipe
This standard is issued under the fixed designation A1117; 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.
1. Scope 2. Referenced Documents
2.1 ASTM Standards:
1.1 This practice defines the minimum requirements for the
application of Thermal Spray Aluminum (TSA) coatings to A941 Terminology Relating to Steel, Stainless Steel, Related
carbon steel pipe for the purpose of preventing atmospheric Alloys, and Ferroalloys
corrosion or corrosion under insulation. This practice is in- C633 Test Method for Adhesion or Cohesion Strength of
tended to be effective for TSA coatings applied at pipe Thermal Spray Coatings
manufacturing facilities or at on-site assembly locations. D4417 Test Methods for Field Measurement of Surface
Profile of Blast Cleaned Steel
1.2 This practice is for the application of TSA to the
D7091 Practice for Nondestructive Measurement of Dry
external surfaces of piping to prevent atmospheric corrosion of
Film Thickness of Nonmagnetic Coatings Applied to
insulated and non-insulated surfaces.
Ferrous Metals and Nonmagnetic, Nonconductive Coat-
NOTE 1—TSA has been found useful for temperatures up to 1000°F
ings Applied to Non-Ferrous Metals
(540°C) for uninsulated surfaces and for preventing corrosion under
insulation for pipes operating in the range of 25°F to 300°F (–4°C to
2.2 Other Standards:
150°C) surface temperature.
AWS C2.18 Guide for the Protection of Steel with Thermal
1.3 This practice includes requirements for surface Sprayed Coatings of Aluminum and Zinc and their Alloys
preparation, materials, application and quality control of TSA AWS C2.25/C2.25M Specification for Thermal Spray
applied to carbon steel piping at the pipe manufacturing facility Feedstock-Wire and Rods
or at an on-site-assembly location. NACE No. 2/SSPC-SP 10 Near-White Metal Blast Clean-
ing
1.4 This practice is expressed in both inch-pound and SI
NACE No. 12/AWS C2.23M/SSPC-CS 23.00 Specification
units. However, unless the order specifies the use of metric
for the Application of Thermal Spray Coatings (Metalliz-
values, inch-pound units shall be used.
ing) of Aluminum, Zinc, and Their Alloys and Composites
1.5 This standard does not purport to address all of the
for the Corrosion Protection of Steel
safety concerns, if any, associated with its use. It is the
NACE SP0198 The Control of Corrosion Under Thermal
responsibility of the user of this standard to establish appro-
Insulation and Fireproofing Materials–A Systems Ap-
priate safety, health, and environmental practices and deter-
proach
mine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accor- 3. Terminology
dance with internationally recognized principles on standard-
3.1 Terms used in multiple A01 standards are defined in
ization established in the Decision on Principles for the
Terminology A941.
Development of International Standards, Guides and Recom-
3.2 Definitions of Terms Specific to This Standard:
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
This practice is under the jurisdiction of ASTM Committee A01 on Steel, the ASTM website.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee Available from American Welding Society (AWS), 8669 NW 36 St., #130,
A01.09 on Carbon Steel Tubular Products. Miami, FL 33166-6672, http://www.aws.org.
Current edition approved Nov. 1, 2023. Published November 2023. DOI: Available from Association for Materials Protection and Performance (AMPP),
10.1520/A1117-23. 15835 Park Ten Place, Houston, TX 77084, https://www.ampp.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A1117 − 23
3.2.1 electric arc spraying, n—a thermal spray coating 6.4 All openings to the interior of the pipe or spool piece
process, in which consumable metal wire is melted by heating shall be sealed to prevent accidental application of TSA to the
with an electric arc and then propelled onto a substrate. interior.
3.2.2 flame spraying, n—a thermal spray coating process
6.5 The blasting abrasive shall be dry, clean and free from
that uses heat from the combustion of a fuel gas with oxygen
contaminants such as oil and grease. Sharp, angular garnet,
to melt a spray coating material which is propelled onto a
aluminum oxide or aluminum silicate shall be used. Other
substrate.
blasting media shall be used only with approval of the
purchaser.
3.2.3 thermal spraying, n—either electric arc spraying or
flame spraying.
6.6 Surfaces to be TSA coated shall be blasted to near white
surface finish per NACE No. 2/ SSPC-SP 10 as a minimum.
4. Summary of Practice
6.7 The anchor profile shall be 3 mils (75 microns) to 6 mils
4.1 This procedure involves the following steps:
(150 microns). The anchor profile shall be measured in
4.1.1 Cleaning and removing burrs from the pipe assemblies
accordance with Test Method D4417, Method B or C.
to be TSA coated,
4.1.2 Protecting components that should not be coated, 6.8 The surfaces to be coated shall be clean and free of
4.1.3 Sealing all openings to the interior of the pipe assem-
abrasive residue and dust prior to TSA application. Maximum
blies to prevent accidental application of TSA to the interior, salt concentration on the surface shall be 2.8 mg/ft (30
4.1.4 Abrasive-blasting the pipe assemblies to be TSA mg/m ).
coated,
6.9 If the blasted surface develops rust bloom or becomes
4.1.5 Applying the TSA coating,
wet prior to TSA application, it shall be dried and blasted
4.1.6 Inspection of the coated product,
again.
4.1.7 Repair, if necessary, and
6.10 Aluminum wire grade 1100 shall be used. The chemi-
4.1.8 Reporting.
cal composition of the wire is given in Table 1. Only aluminum
5. Significance and Use
wire designated by the wire manufacturer for thermal spraying
shall be used.
5.1 The quality and effectiveness of TSA coatings is depen-
dent on a variety of factors including surface preparation,
6.11 The aluminum wire shall be dry and free of scale, oils
coating materials, environmental conditions and control of the
or coatings.
applications process. This practice addresses the fundamental
6.12 The surface to be coated shall be at least 5°F (3°C)
variables and concerns relative to proper TSA application.
above the dew point and the relative humidity shall be below
5.2 TSA has been proven to offer resistance to the atmo-
90 % during spraying.
spheric corrosion of carbon steel pipe and to corrosion under
6.13 Unless the purchaser has specified a different value, the
insulation (CUI). The publication NACE No. 12/AWS
TSA thickness shall be not less than 10 mils (250 microns) and
C2.23M/SSPC-CS 23.00, AWS C2.18 and NACE SP0198
not more than 20 mils (500 microns). If the purchaser has
provide additional information regarding the performance of
specified the coating thickness, the specified coating thickness
TSA coatings.
shall be considered the minimum thickness and the maximum
thickness shall be the specified thickness plus 10 mils (250
6. Procedure
microns).
6.1 Piping surfaces to be TSA coated shall be accessible for
6.14 Unless the purchaser has specified a different value, the
grit blasting and TSA coating application.
TSA surface roughness shall not exceed 3500 μin (90 μm) R
Z
6.2 Prior to bl
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