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AWS C2.23M/C2.23:2018 pdf free download
AWS C2.23M/C2.23:2018 pdf free download.Specification for the Application of Thermal Spray Coatings (Metallizing) of Aluminum, Zinc, and Their Alloys and Composites for the Corrosion Protection of Steel.
5. Surface Preparation Requirements
5.1 Pre-preparation Requirements
5.1.1 Ambient Conditions. The steel surface temperature shall be at least 3 °C (5 °F) above the dew point temperature of the ambient air.
5.1.2 Cleanliness of Compressed Air. Verify the cleanliness of compressed air in accordance with ASTM D4285.
5.2 Surface Cleanliness
5.2.1 Immediately before the TSC application, the steel substrate shall be prepared in accordance with:
(I ) White metal finish, SSPC-SP 5/NACE No. I, for immersion service: or
(2) The minimum of near-white metal finish, SSPC-SP lO/NACE No. 2, for other service applications; and
(3) The level of nonvisible contamination specified in the procurement documents (project specifications).
Although the surface preparation and the TSC application are normally performed during the same shift, dehumidification or other methods may be utilized to preserve the surface cleanliness for a longer period if approved by the owner. The surface shall be inspected just before the application of the TSC and shall comply with the requirements of the applicable standard.
Annex C contains descriptions of SSPC Environmental Zones, including immersion service.
5.2.2 Mineral and slag abrasives including aluminum oxide shall be selected and evaluated in accordance with SSPC-AB 1, recycled ferrous metallic abrasives in accordance with SSPC-AB 2, and steel grit in accordance with SSPC-AB 3 (see Annex C3). SSPC-VIS 125 provides visual reference photographs illustrating typical examples of SSPC-SP lO/NACE No. 2 and SSPC-SP 5/NACE No. 1 cleanliness. The reference photographs arc often used to supplement, but not to replace, the requirements of the written standards.
5.2.3 Blast surface preservation products shall not be used.
5.3 Surface Profile. Unless otherwise specified, the steel substrate shall have, at a minimum, a sharp angular profile with a minimum depth of 65 im (2.5 mil) and a maximum depth of 125 pm (5.0 mu) as measured in accordance with SSPC-PA 17, using ASTM D441 7 Method B (depth micrometer) or Method C (replica tape). If Method C is used, measurements close to the upper limit of tape measurement capability should be confirmed using Method B to ensure that the maximum depth has not been exceeded.
6. Thermal Spray Equipment Setup
Thermal spray equipment shall be set up. adjusted, and the correct spray pattern verified, in accordance with the
equipment manufacturer’s instructions and technical manuals or the TSC applicator’s qualified procedure.
7. Job Reference Standard (JRS)
7.1 A iRS shall be prepared for each TSC application or product by a qualified spray operator or by a qualified
operator of a mechanized robotic spray unit. The JRS shall be prepared using the qualified application procedure and is intended to be used as a “comparator” to evaluate the application process as it proceeds.
7.1.1 The JRS shall be made with the actual field equipment and the process parameters and procedures (surface preparation and thermal spraying) to be used for the contracted work.AWS C2.23M/C2.23:2018 pdf free download.
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