Find the most up-to-date version of ASTM B at Engineering Purchase your copy of ASTM B – 70() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. ASTM B + REDLINE: STANDARD PRACTICE FOR RATING OF ELECTROPLATED PANELS SUBJECTED TO ATMOSPHERIC EXPOSURE – INCLUDES.
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Typical decorative deposits exposed to marine atmospheres often tend to fail by crater rusting, whereas in industrial atmospheres, they are more likely to exhibit pinpoint rusting; and asym latter atmosphere also tends to be more severe with regard to degradation of the coating system but somewhat less severe with regard to basis metal corrosion.
Please login to your authorized staff account to use this feature. It is based on experience in use of the method with standard by cm 4- by atsm.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Enter your account email address to request a password reset: R is rounded off to the nearest whole number, leading to the tabulation given in Table 1.
A number in parentheses indicates the year of last reapproval.
Any modifications needed to adapt the method to rating actual production parts are not considered here. Therefore, the appearance rating cannot be assigned with the same degree of precision as can the protection rating.
Enter your personal account email address to request a password reset: Any modifications needed to adapt the method to rating actual production parts are not considered in this practice.
Panels shall be assigned separate rating numbers based on the ability of the coating to protect the substrate from corrosion protection ratingand the overall appearance of panels as affected by deterioration of the coating itself appearance rating. It is not intended for use with anodic sacri?
In addition the 5b37 files may not be downloaded or distributed elsewhere over computer networks or otherwise. For example, if a panel rates as low as 4 for protection, it may be difficult to assess any additional appearance defects.
Permanent or massive atm of basis metal corrosion such as that in pinholes, bare, or? If dirt, salt deposits, and so forth, make it impractical to inspect them, panels may be sponged with a mild soap solution followed by water rinse; but no pressure should be exerted in this procedure such as would tend to upgrade the rating by, asm example, cleaning off rust or rust stain.
Such panels may arbitrarily be assigned one of two appearance ratings: Original adjunct produced in Preparation for and Manner of Inspection NOTE 4—It may be desirable to expose panels for test even though they are defective in certain respects before exposure. Register for a trial account.
ASTM B537 – 70(2013)
Accordingly, rating numbers shall be derived from the type of defect that exists, that is: Content only available by subscription. Inspection should be made in the as-is condition, and defects to be taken into account are only those that can be seen with the unaided eye at normal reading distance.
This method is used with standard-sized panels exposed on standard ASTM racks at outdoor test sites in both natural atmospheres and accelerated test conditions. Current edition approved Oct.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Lighting during inspection should be as nearly uniform as possible; direct re? ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
For this reason, the same standard comparison photographs or charts are asstm suitable for use at both types of locations; photographs are more helpful in assessing panels exposed to marine atmospheres, whereas dot charts can be used for industrial locations Appendix X2. If there are surface defects not accounted for in the protection rating, the appearance rating will be one or more units lower than the protection rating. Similarly contact and rack marks, mounting holes, and so forth, should be disregarded.
The standards represent as nearly as possible satm maximum amount of corrosion permissible for a given rating; there is a standard for each rating 1 through 9. Corrosion pits probably not extending through to the basis metal—that is absence of obvious basis metal corrosion products bleeding therefrom.
ASTM B (Reapproved )e1_图文_百度文库
For example, surface pits that begin to detract from re? Assignment of Appearance Rating 7. No further reproductions authorized.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. Rating 10, accordingly, is arbitrarily assigned to a panel with no defects, and the equation operates at ratings 9 and below. It has been used also for rating similar panels that have been subjected to accelerated tests such as those covered by Practice B, Method B, Test Method B, and Test Method B It is not intended for use with anodic sacrificial coatings such as zinc and cadmium on steel.