SAE AMS2486F-2024
Conversion Coating of Titanium Alloys Fluoride-Phosphate Type

Standard No.

SAE AMS2486F-2024

Release Date

2024

Published By

Society of Automotive Engineers (SAE)  US  /  SAE

Latest

SAE AMS2486F-2024

Introduction

Key points of the standard changes

Revised items	AMS2486E requirements	AMS2486F updates
Conversion tank composition	No clear resistivity requirement	50000 ohm-cmMinimum resistivity (≤20µS/cm)
Fixture contact requirements	Not systematically specified	Added 3.2.1 to clarify the contact point specifications for fully enclosed/non-fully enclosed parts
Coating adhesion test	Basic requirements only	Added 4.3.3 Primer Adhesion Water Immersion Test Method

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Detailed Explanation of Key Technical Parameters

Conversion Tank Composition Requirements

The standard stipulates that the conversion tank must contain the following ingredients (technical grade or higher):

• Trisodium phosphate: 48.7-51.6 g/L (6.5-6.9 oz/gal)
• Potassium fluoride: 17.2-24.0 g/L (2.3-3.2 oz/gal)
• Hydrofluoric acid: 12.0-21.0 g/L (1.6-2.8 oz/gal)

The operating temperature must be strictly controlled within the range of 27±6°C, and the resistivity of the replenishing water must be ≥50,000 ohm-cm.

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Quality Assurance System

Test Classification and Frequency

Test Type	Test Items	Execution Frequency
Acceptance Test	Color/Adhesion/Water Spot/Quality	Must be tested for each batch
Periodic Test	Primer Adhesion/Solution Analysis	Monthly or as specified by the engineering party
Pre-production Test	Full Performance Verification	First article/Process change

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Implementation Suggestions

Critical Control Points

1. For precision components, it is recommended to use the ARP4992 standard for periodic solution testing.
2. Dissimilar metal components such as threaded inserts must undergo masking in 3.2.3.
3. When the water stain area exceeds 5%, a process check should be initiated (see 3.4.4).

Special Processing

When there is a significant color difference between the weld area and the substrate, a grain size difference assessment should be performed in accordance with 3.5.1. When mixed processing of castings and machined parts, it is recommended to perform conversion processing in batches.

SAE AMS2486F-2024 history

• 2024 SAE AMS2486F-2024 Conversion Coating of Titanium Alloys Fluoride-Phosphate Type
• 2018 SAE AMS2486E-2018 Conversion Coating of Titanium Alloys Fluoride-Phosphate Type
• 2010 SAE AMS2486E-2010 Conversion Coating of Titanium Alloys Fluoride-Phosphate Type
• 2004 SAE AMS2486D-2004 Conversion Coating of Titanium Alloys Fluoride-Phosphate Type
• 2001 SAE AMS2486C-2001 CONVERSION COATING OF TITANIUM ALLOYS Fluoride-Phosphate Type
• 1994 SAE AMS2486B-1994 CONVERSION COATING OF TITANIUM ALLOYS Fluoride-Phosphate Type
• 1986 SAE AMS2486B-1986 Conversion Coating of Titanium Alloys Fluoride-Phosphate Type
• 1984 SAE AMS2486A-1984 CONVERSION COATING OF TITANIUM ALLOYS Fluoride-Phosphate Type
• 1973 SAE AMS2486-1973 CONVERSION COATING OF TITANIUM ALLOYS Fluoride - Phosphate Type

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