Qualification Requirements and Application of Composite Fluropolymer/Ceramic Coatings to Fasteners 09-SAMSS-107 [PDF]

This article is about 09-SAMSS-107 PDF Download – Qualification Requirements and Application of Composite Fluropolymer/Ceramic Coatings to Fasteners for coating, mechanical and piping engineers.

09-SAMSS-107 PDF Download

09-SAMSS-107

Requirements and Application of Composite Fluropolymer / Ceramic Coatings to Fasteners

The 09-SAMSS-107 Specification outlines essential guidelines for applying Composite Fluoropolymer/Ceramic Coatings to threaded steel and stainless steel fasteners in a shop setting. Here are the key points:

Scope of the Specification:

• This specification exclusively covers the mandatory requirements for the application of Composite Fluoropolymer/Ceramic Coatings to threaded steel and stainless steel fasteners.
• It is essential to note that this specification does not address the prerequisites for fasteners without coatings.

Fastener Characteristics:

• Fasteners themselves are not characterized in detail within this specification.
• The focus is on the application and assessment of these specialized coatings.
• It is assumed that the fasteners, to which these coatings are being applied, adhere to relevant specifications and are suitable for their intended purpose.
• Thread tolerances are expected to be suitable for subsequent coating processes.

In essence, 09-SAMSS-107 provides clear instructions and requirements for applying Composite Fluoropolymer/Ceramic Coatings to threaded steel and stainless steel fasteners, ensuring that the coating process is carried out correctly and effectively. It assumes that the fasteners being coated are of appropriate quality and design for their intended usage.

Industry Codes and Standards

Swedish Standards Institute
SIS 05 59 00 Sa3 – Pictorial Surface Preparation Standard for Painting Steel Surfaces
The Society for Protective Coatings
SSPC SP5 – Surface Preparation Specification Number White Metal Blast Cleaning
SSPC PA2 – Measuring Dry Film Thickness

British Standards Institution
BS 3900 – Methods of Test for Paints Part E-6: Cross-Cut Test (ISO 2409: 1992)
American Society for Testing and Materials
ASTM B117 – Standard Method of Salt Spray Testing
ASTM D512 – Tests for Chloride Ion in Water and Waste Water
ASTM D516 – Tests for Sulfate Ion in Water and Waste Water

Processing Requirements

Processing threaded steel and stainless steel fasteners with Composite Fluoropolymer/Ceramic Coatings requires a series of meticulous steps to ensure a proper application. Here are the key points:

Handling, Cleaning, and Degreasing:

1. Use appropriate equipment to handle fasteners to prevent damage.
2. Thoroughly clean substrates by removing all grease and oil. Cleaning methods include:

• Baking at 380-400°C for a minimum of 3 hours.
• Hot alkali degreaser plus water wash.
• Chlorinated hydrocarbon solvent.

1. Acid pickling is not permitted for cleaning.

Abrasive Cleaning:

4. After cleaning, fasteners must undergo abrasive cleaning to achieve a clean, scale-free, and chemically active surface.
5. Minimum abrasive quality should be SIS 05 59 00 Sa3 (or SSPC SP5).
6. Approved abrasives include chilled iron grit, aluminum oxide, garnet, or their equivalents.
7. Abrasive should be clean, dry, and low in sulfates and chlorides.
8. Subsequent processing should occur before surface rusting develops, preferably within two hours of abrasive cleaning.

Post-Cleaning:

9. After abrasive cleaning, remove debris and dust through air blasting or solvent wash and dry.

Application of Composite Fluoropolymer/Ceramic Coating:

10. All fasteners must be coated with an appropriate grade of composite fluoropolymer/ceramic coating.
11. Coating materials should be marked with manufacturer details, batch information, and more.
12. Coating materials must be stored and handled according to the manufacturer’s recommendations.
13. Coating and surface preparation should only proceed when the fastener’s surface temperature is at least 3°C above the dew point.

Number and Thickness of Coats:

14. Apply primer in one coat with a dry film thickness (DFT) of 20 to 30 microns.
15. Apply the finish coat to a DFT of 10 to 15 microns.
16. The total DFT should be between 30 and 45 microns.

Curing Cycles:

17. Follow curing cycles as specified in the Manufacturer’s Product Data Sheets.
18. Regularly measure metal temperature during curing cycles to ensure adequate cure. At least one fastener per coating batch should be checked.
19. Attach a thermocouple to the fastener for temperature monitoring.
20. Verify that the monitored fastener achieves the specified cure.
21. Ensure threaded steel fasteners are not exposed to temperatures exceeding 400°C during processing.

By adhering to these processing requirements, threaded steel and stainless steel fasteners can be effectively coated with Composite Fluoropolymer/Ceramic Coatings to meet the necessary standards and quality specifications.