ASTM F2660-12 - 1.9.2012
 
Significance and Use

4.1 This test method describes the testing procedure that shall be used to qualify a coating system that is under consideration for use on ASTM A490 high strength structural bolts made of any steel composition permitted by the A490 specification. The test method measures the susceptibility of coated specimen bolts to the influence of an externally applied potential (see 7.2.3.3) by testing for the threshold of embrittlement in a salt solution environment.

 
1. Scope

1.1 This test method defines the procedures and tests to evaluate the effect of a coating system on the susceptibility to environmental hydrogen embrittlement (EHE) of an ASTM A490 high strength structural bolt.

1.2 This test method shall qualify a coating system for use with any size of A490 bolts (that is, 1/2 to 1-1/2 in.) high strength structural bolts, relative to EHE.

1.3 The characteristic to be evaluated by this test method is the susceptibility to EHE caused by hydrogen generated from corrosion protection of the steel bolt by sacrificial galvanic corrosion of the coating. Testing shall be performed on coated, specimen ASTM A490 bolts manufactured to the maximum susceptible tensile strength values (see Table 1) of the bolt (see Section 5 Specimen Bolt Requirements). The internal hydrogen embrittlement (IHE) susceptibility will also be inherently evaluated when the EHE is tested through this test method. There is no need for a separate IHE susceptibility test.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

 
2. Referenced Documents

G15-08

Standard Terminology Relating to Corrosion and Corrosion Testing (Withdrawn 2010)

G44-21

Standard Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5 % Sodium Chloride Solution

Specification for Structural Joints Using High Strength Bolts (ASD)

Allowable Stress Design

Townsend Jr., H. E.,

Met Trans, V6A, April, 1976

Raymond, L.,

The Susceptibility of Fasteners to Hydrogen Embrittlement and Stress Corrosion Cracking: Fastener System Design. In J. H. Bickford, & S. Nassar, Handbook of Bolts and Bolted Joints, New York, USA: Marcel Dekker, Inc., 1998, pp. 723-756

ISO 17025

General Requirements for the Competence of Testing and Calibration Laboratories

G82-98(2021)e1

Standard Guide for Development and Use of a Galvanic Series for Predicting Galvanic Corrosion Performance (Includes all amendments and changes 1/21/2021).

Specification for Structural Joints Using High Strength Bolts (LRFD)

Load and Resistance Factor Design

A490-14

Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength

E4-21

Standard Practices for Force Calibration and Verification of Testing Machines

E8/E8M-24

Standard Test Methods for Tension Testing of Metallic Materials

F519-23

Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments

F606-14

Standard Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets

F1624-12(2018)

Standard Test Method for Measurement of Hydrogen Embrittlement Threshold in Steel by the Incremental Step Loading Technique

F1789-23

Standard Terminology for F16 Mechanical Fasteners

F2078-22

Standard Terminology Relating to Hydrogen Embrittlement Testing

G3-14(2019)

Standard Practice for Conventions Applicable to Electrochemical Measurements in Corrosion Testing