He is asking for more info on the difference between ASTM B [link by ed. to spec at TechStreet] type II and type III. Can anyone give me some direction on. ASTM B Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel. This specification covers requirements for electrodeposited. ASTM B Thickness classes for coatings: KEY: Classification #, Service condition, Thickness Fe/Zn 25, SC4 (very severe), 25um or ″ Fe/Zn 12, SC3.

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If you feel that your comments have not received a far hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. Our b633-11 would zstm to go to a clear zinc, but our customer is under the assumption that the clear will not do as good a job with corrosion resistance and salt spray life.

Until a very few years ago chromate conversion coatings were based on hexavalent chromium, and deposited a thick film that was relatively easy to dye. Subject the selected samples 10 the salt spray test; the length of time to be applicable for the type specimens, hol-rolled steel specimens may be used lo represent of supplementary coating shall be in accordance with the forged and cast steel articles.

Kaushik, The “Types” define supplementary finishes to be done after the plating. This standard is also available to be included in Standards Subscriptions. The sampling plan used for the inspection of the qualily coated article shall be agreed upon betweet1 the purchaser and producer.


This applies to all metals. Not the least of which is the environmental regulations impact on the future of the selected finish. Thank you for your hard work which the finishing world continues to benefit from. H1 ; are used, rernove the supplementary treatment prior to testing.

Hello Claudio and Doug, My compliments for an excellent round of questions! If these heat treatments are not required, the purchaser shall spcciljr in their exception 5 2 5. A nunlher in parentheses indicates the ycar uf liut reapproval. This standard is not included in any packages. Going with clear will make it difficult to tell what is clear chromated zinc vs.

Packaging and Packing Can anyone give me some direction on how to get the customer to accept going to clear. If the document is revised or amended, you will be notified by email. Corrosion Resistance Requirements Types. Could you explain this? Need more than one copy? Test Method 13Guide Band Test Method 13 contain sampling plans that are designed for sampling inspection of coatings.

ASTM B-633 Type II vs. III zinc plating

It does not cover clectrodepositecl zinccoattxl skel wire or sheets sce Specificalivn A lA 5OlM for sheets. Condilions affecting the electroplating of specimens, including N n. The end user v633-11 decide when a part fails, at “white rust” corrosion the chromate has failed or red rust both the chromate and the zinc are gone exposing the base metal.

So if I’m interpreting this correct, there is both a color difference and a salt spray difference. This is not considered a decorative finish and will not generate matching parts. Materials and Manufacture 6.


The separale specimens shall be ol’ a basis metal equivalent to that of the articles represented. 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.

Surfaces left-bare should be heavily chromated.

ASTM B – Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel

Did you ever get the answers you were looking for? Answer is based upon pre versions of B, Proceed to Checkout Continue Shopping.

It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. I have the exact same questions. How do you know if it is astk to be Zinc Yellow or Zinc Clear? Add to Alert PDF. Sorry, but if you need one particular look, you must go through the ugly process of maintaining sample boards with acceptable zstm.

When Test Metllods 1 Raked park shall not crack or fail by fracture when tested in accord;mce with Put the chromate on light. What do you say? Mark Hollenbeck alloys – Muskegon, Michigan A. Rcfcrcnccd 1 ocuments 2. With Clwses Fern and Ffl,nl3. You may delete a document from your Alert Profile at any time. Please first verify your email before subscribing to alerts. A light yellow would be better than a clear.

Xstm example, b633-1 cold-rolled steel