ASTM B Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel. Buy ASTM B SPECIFICATION FOR ELECTRODEPOSITED COATINGS OF ZINC ON IRON AND STEEL from SAI Global. ASTM B Type II and III zinc chromate plating Q&A’s. In my opinion a Mil-C- [link is to free spec at Defense Logistics Agency, ] plating.

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B — 07 Standard Speci? Gree 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. It does not cover electrodeposited zinccoated steel wire or sheets see Speci? 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.

Additional types have been added to permit non-chromate passivate treatments to be used in replacement of hexavalent chromium. Current edition approved Jan.

Originally approved in Last previous edition approved in as B — 98e1. Materials and Manufacture 6. In this event, the basis metal shall be subjected to such polishing or buffing operations as are necessary to yield deposits with the desired?

Zinc Plating: ASTM B Type II vs. III

To minimize problems of this sort, the speci? It is recommended that the following appropriate recommended practices and guides be used: BBBBand B If these n633 treatments are not required, the purchaser shall specify in the ordering information their exception, 5. If the purchaser does not specify an exception to heat treatment, then the plater shall use Table 1 in B to determine the appropriate heat treatment for the steel based on its tensile strength. If these heat treatments are not sstm, the purchaser shall specify in the ordering information their exception 5.

The baking treatment shall be done before the application of the supplementary treatments and awtm 4 h of removal from the last process. Electroplated springs and other parts subject to? Baked parts shall not crack or fail by fracture when tested in accordance with NOTE 1—Surfaces should be activated as soon as possible following baking and handled carefully to avoid contamination and maintain an active surface for post processing.

Therefore, it is recommended that supplementary treatments not be applied to zinc coatings having a nominal thickness less than 5? The electroplated article shall be clean and free of damage. Properly performed, statisitical process control will assure coated products of satisfactory quality and will assure fred amount of acceptance inspection. The sampling plan used for the inspection of the quality coated article shall be agreed upon between the purchaser and producer.


Zinc Coating

The inspection lot is then classi? The size of the sample and the criteria for compliance are determined by the application of statistics. The procedure is known as sampling inspection. Test Method B provides a default plan if one is not speci?

Guide B provides a default plan if one is not speci? The test must yield a numeric value and certain statistical requirements must be met.

Test Method B contains several plans and also gives instructions for calculating plans to meet special needs. This guide provides for two plans: The separate specimens shall be of a basis metal equivalent to that of the articles represented. When such areas are designated, and thus made subject to minimum thickness requirements, the purchaser and the manufacturer shall recognize the necessity for either thicker deposits on other areas or for special racking.

NOTE 4—The dimensional tolerance of most threaded articles, such as nuts, bolts, screws, and similar fasteners with complementary threads, normally does not permit the application of a coating thickness much greater than 8. If heavier coatings are required, allowance for the deposit buildup must be made during the manufacture of the threaded articles.

For corrosion resistance requirements, see Table 2. The coating shall not be stained or discolored. For example, a cold-rolled steel surface shall not be used freee represent a hot-rolled steel surface. Due to the impracticality of forging or casting separate test specimens, hot-rolled steel specimens may be used to represent forged and bb633 steel articles.

The separate specimens may also be cut from scrap castings when ferrous alloy castings are being electroplated. These separate specimens shall be introduced into a lot at regular intervals before the cleaning operations, preliminary to electroplating, and shall not be separated therefrom until after completion of electroplating.

Conditions affecting the electroplating of specimens, including the spacing, plating media, bath agitation, temperature, etc. Unless a need can be demonstrated, separately prepared specimens shall not be used in place of production items for nondestructive and visual examinations. NOTE 5—Thickness methods that rely on the purity of the zinc deposit may not be sufficiently accurate when evaluating coatings produced from non-cyanide zinc solutions.


These methods would include BBand Ftee Subject the selected samples to the salt spray test; the length of time to be applicable for the type of supplementary coating shall be in accordance with the requirements of 7. The salt spray test shall commence asrm 72 h of the completion of the aging period. For these reasons a? They may be reconsidered for inspection in accordance with Test Method B The purchaser may similarly require that a report of the test results be furnished.

Packaging and Packing When Test Methods B33Bor B are used, remove the supplementary treatment prior to testing. The chromate, passivate, or supplemental?

Responsibility for Inspection S1. Except as otherwise speci? The purchaser retains the right to perform any of the inspections and tests set forth in this speci? While the conditions of exposure and uses of electroplated metal are so varied that it is not de?

As a result of large-scale and long-range tests conducted by ASTM and other organizations, there is excellent information on the corrosion behavior of zinc and zinc coatings. The following data, based on worldwide testing, can be used to compare the behavior of electrodeposited coatings of zinc in various atmospheres.

The values are only relative, since individual studies in various parts of the world have resulted in? 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.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

If you feel that your comments have not received a fair hearing you should make your views n633 to the ASTM Committee on Standards, at the address shown below. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.