ASTM D evaluation ASTM D ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
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ASTM D evaluation ASTM D ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1. The values given in parentheses are for information only. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Referenced Documents 2. Apparatus 4. ANSI B See Fig. The tool bit is typically mounted in a holder such as a wooden? Typically the gripping surface is knurled. The tip may be replaceable or permanent. Current edition approved March 1, Published April Originally approved in Last previous edition approved in as D — 92 The guard must be placed between the air nozzle and the operator. A device such as a sand-blasting cabinet has been found to be acceptable.
Occupational Safety and Health Administration regulation. Preliminary Treatment of Test Specimens 5. This position will allow solution droplets to run lengthwise along the scribe. Position the tool so that only the tip is in contact with the surface.
Pull the scribing tool to obtain a uniform V-cut through the coating that is being tested. Inspect the tool frequently, using low power magni? The scribe should be of sufficient length to cover the signi? The scribe must penetrate all organic coating layers on the metal, leaving a uniformly bright line. The extent of scribe penetration through metal coatings, such as galvanize, should be agreed upon between the producer and user. The coil coating industry typically requires scribes to penetrate all organic coating layers but not penetrate the metal coating layers.
The automotive industry typically requires scribes to penetrate all organic and metal coating layers. The pencil type may be less effective than the lathe tool type when scribing coating systems consisting of multiple layers of organic coat- ings or coating systems including metal layers. When scribing coating systems consisting of multiple layers of organic coatings or coating systems including metal layers the depth and quality of scribe technique should be evaluated using the cross section, castable plastic mount, polishing technique described in Practice E 3.
Quality of the scribe technique may also be observed with the aid of low-power magni? Note, mark, and describe defects, coding, and? The use of more than one cut must be agreed to between all concerned parties prior to scribing, and the number of cuts must be recorded in the test documentation.
When multiple cuts are needed, each cut must be done in the same direction. Expose such specimens in accordance with Section 6 and rate for corrosion of the general surface in accordance with Section 8. Exposure of Test Specimens 6. Equivalents may be used. D — 05 and the user. The length of test and evaluation intervals should be agreed upon prior to exposure of specimens.
Procedure A—Evaluation of Scribed Specimens 7. Complete the air blasting within 15 min of specimen removal from the exposure cabinet. If the air blasting cannot be completed within the prescribed time, immerse the specimens in water at room temperature or store in a plastic bag to avoid any drying effect.
Scrape the specimen vigorously with an instrument described in 4. Hold the scraper with its face perpendicular to the specimen surface and parallel to the scribe, moving it back and forth across the scribe to remove the coating that has been undercut and has suffered loss of adhesion only, not to remove the coating that still has adhesion.
Complete the scraping within 15 min of specimen removal from the exposure cabinet. If scraping cannot be completed within the prescribed time, immerse the specimens in water at room temperature or store in a plastic bag to avoid any drying effect. NOTE 2—Rinsing, scraping, or air blow off may not be appropriate in all cases, such as for interim ratings in continuing tests. Alternative methods may be used if agreed upon between the producer and the user.
Procedure B—Evaluation of Unscribed Areas 8. Dry the surface of the specimen with paper towels or compressed air. Drying should be done in such a manner that the corrosion on the specimen surface is not disturbed. Where the character of the failure permits, the photographic blister standards given in Test Method D may be used to describe the results of the exposure test, with respect to size of blisters or corroded areas, while Test Method D may serve to describe the frequency and distribution of rusting.
Record the size, frequency, or area affected. Discount corrosion within NOTE 3—Formation of under-? Exercise care to avoid alteration of the corrosion pattern or pretreatment.
NOTE 4—Where the character of the failure permits, the photographic blister standards given in Test Method D may be used to describe the results of the exposure test, in respect to size of blisters or corroded areas, while Test Method D may serve to describe the frequency and distribution, if desired.
Record the representative mean, maximum, and minimum creepage from the scribe, and note whether or not the maximum is an isolated spot. Record creep values in millimeters, inches, or rating numbers, as agreed upon between producer and user. Also, rate in accordance with Table 2 the prevalence of corrosion on areas removed from the scribe. Procedure C—Evaluation of Unprotected Edges 9. Procedure D—Evaluation of Formed Areas Report Precision and Bias Keywords Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
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ASTM D1654 - 08(2016)e1
The purpose of the ASTM D test method is to provide a standardized procedure for the evaluation of corrosion performance of coatings and metal pretreatments subjected to one of a variety of corrosion resistance exposures. ASTM D describes the scribing of coated samples through the coating layer and into the substrate using one of a number of scribe tools. Assured Testing Services places parts or panels inside corrosion resistance exposure chambers, exposing them continually for specified periods of time. Following exposure, the samples are evaluated for corrosion resistance performance.
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Test Panel Evaluation (ASTM D 1654)