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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ASTM B (Reapproved )e1_图文_百度文库
Lighting during inspection should be as nearly uniform as possible; direct re? Link to Active This link will always route to the current Active version of the standard. You currently cannot view this content. It is not intended for use with anodic sacrificial coatings such as zinc and cadmium on steel. NOTE 6—If fractional rating was used for the protection number, this would result in a fractional appearance rating; in that case the fractional appearance rating may be retained, or rounded off to the nearest whole number, provided, however, that the appearance rating may not be higher than the protection rating.
These photographs and charts4 are 10 by 15 cm 4 by 6 in. It has been used also for rating similar panels that have been subjected to accelerated tests such as those covered by Practice BMethod BTest Method Band Test Method B 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 the 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.
One method of facilitating this comparison is to remove individual panels from their racks and place them beside other panels. 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.
For this xstm, the same standard comparison photographs or charts are not 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. No further reproductions authorized. For example, surface pits that begin to detract from re? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phoneadtmor service astm.
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 based on experience in use of the method with standard by cm 4- by 6-in. 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. One point is assessed if the defects can be classi?
It is based on experience in use of the method with standard by cm 4- by 6-in. Fractional ratings below 9, although normally not especially useful, may be assigned if desired. Originally approved in 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. Content only available by subscription. Please sign into an account with a subscription to this content, or email for help at support madcad.
Any modifications needed to adapt the method to rating actual production parts are not considered in this practice.
ASTM B537 – 70(2013)
Permanent or massive type of basis metal corrosion such as that in pinholes, bare, or? Similarly contact and rack marks, mounting holes, and so forth, 5b37 be disregarded. R is rounded off to the nearest whole number, leading to the g537 given in Table 1. Basis of Procedure 3. Therefore, the appearance rating cannot be assigned with the same degree of precision as can the protection rating. In addition the electronic files may not be downloaded or distributed elsewhere over computer networks or otherwise.
Difficulties may be encountered in attempting to rate severely corroded panels.
Please login to your authorized staff account to use this feature. Peeling of the coating from the substrate, or of one coat from another, is the principal such defect. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The standards represent as nearly as possible the maximum amount of corrosion awtm for a given rating; b357 is a standard for each rating 1 through 9.
Although these functions overlap, they can be evaluated separately and it is frequently desirable to do so. 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, for example, cleaning off rust or rust stain. 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.
Accordingly, this practice assigns separate ratings to 1 appearance as affected by corrosion of the substrate and 2 appearance as affected by deterioration of the zstm itself. Accordingly, rating numbers shall be derived from the type of defect that exists, that is: For example, it may be agreed that any panel with a protection rating of 5 is so unacceptable that an asrm rating has no meaning. This practice covers the recommended method for rating ashm condition of electroplated test panels subjected to corrosive environments for test purposes.
It aztm 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 Corrosion pits probably not extending through to the basis metal—that is absence of obvious basis metal corrosion products bleeding therefrom.