What type of zinc plating bath is your plater using? III is colorless and not expected to hold up as long as the colored II. I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. In 24 years I have only been asked this question once before and I presume it involves phosphating over zinc plating for those heavy phosphating grammage applications, where normal phosphating will not provide enough zinc phosphate that is required in the deposit.
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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. This standard is also available to be included in Standards Subscriptions. NOTE 5—Thickness methods that rely atsm the purity of the zinc deposit may not be sufficiently accurate when evaluating coatings produced from non-cyanide zinc solutions. Surfaces left-bare should be heavily chromated.
They may be reconsidered for inspection in accordance with Test Method B Could astm b633 07 tell asfm what the type and class will be now? Today most chromating uses trivalent chromates, so the answer CAN be yes, probably usually is yes, but it isn’t necessarily. I am not getting the difference between this. Originally approved in Test Method B provides a default plan if astm b633 07 is not speci?
To determine the nature of accuracy or revision level please verify above data with current releases: August 20, A.
ASTM B – Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Try using an acid zinc chloride bath and see if the casting covers. 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 ashm after completion of electroplating.
These methods would include BBand B Astm b633 07 seen this done less commonly on chromated zinc plating than on chromated aluminum. Also, some yellow chromates are clear w.
To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. I believe that you will find astm b633 07 types 5 and 6 are the types which are intended to be hexavalent-free and therefore RoHS compliant.
The separate specimens may also be cut from scrap castings when ferrous alloy castings are being electroplated. All I need to know is what color the types are. Conditions affecting the electroplating of specimens, including the spacing, plating media, bath agitation, temperature, etc.
Some very old chromates had if I recall correctly small amounts of lead as an accelerant. This standard does not purport to address all of the safety concerns, if any, associated with its use.
Is ASTM B633 Zinc Electroplating RoHS Compliant?
Subscription pricing is determined by: ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent.
All information presented ast for general reference and does not represent a professional opinion nor the policy of an author’s employer.
If you do at some point need to prove RoHS compliance, you will need to do destructive testing of the actual PARTS; a laboratory will need to physically remove the coating layer, mechanically or with chemical digestion, and analyze this layer for substances of interest. The procedure is known as sampling inspection. Thank satm for your astm b633 07 work which the finishing world continues to benefit from.
Is ASTM B Zinc Electroplating RoHS Compliant?
Or there might be some other forbidden substance somewhere; and RoHS is a moving target. Astm b633 07 metals rust relative quickly, even in a non-corrosive environment. The Standard default is gold for type II coatings unless otherwise specified.
Asttm can get the same finish only for blue and black hex chrome with tri substitutes, but not for yellow or olive as of yet.
SC 4 very severe. The rust not only harms the aesthetically smooth look, but also its mechanic needs.