Zinc [ASTM-B] This specification covers requirements for electrodeposited zinc coatings applied to iron or steel articles. ASTM B ELECTRODEPOSITED COATINGS OF ZINC ON IRON AND STEEL. The coating is made according to demand, where the distribution is as follows. Blue/Zinc. Blue/Zinc. Yellow/Zinc. Yellow/Zinc. ASTM B Type II SC 3 (FE/ZN 13). Type II SC 2 (FE/ZN 8). Type II SC 1 (FE/ZN 5). Type III SC 3(FE/ZN 13).
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The electrical resistance of this green layer passivation is very high because it is thick in relative to other passivations. Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. Any information would be well received.
Olive green passivation is a chromate passivation in a green hue that gives excellent corrosion resistance ability hours in a salt spray test and is a good base for paint. 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 ast, that is required in the deposit.
The type of passivation is determined according to the required characteristics, and is divided into groups:.
ASTM B-633 Type II vs. III zinc plating
I will be attending the ASTM B8 committee meetings in Philly later this week and will mention this letter to the sub-committee chair responsible for the B spec. Hi, I recently b633-58 2 batches of parts from two separate platers using this specification. Yellow-iridescent Black Olive Green. The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments.
Olive Drab chromate is hrs. According to RoHS the homogeneous and non-homogeneous are defined in such manner that every wstm may understand that the layer is removable let’s see how. The answer is Yes. But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably requires dye. Obviously, this must be clarified by the customer.
The Standard default is gold for type II coatings unless otherwise specified. To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing. Regards, Ted Mooney, P. The above entries are somewhat dated: It still will have Hex Chrome.
I’m not a zinc plater, but ‘Type II Clear’ seems self-contradictory. What do you say? A heavy chromate will shear under paint and cause the paint to peel. Going with clear will make it difficult to tell what is clear chromated zinc vs. Does plating make that big astn difference knowing that it’s going to be painted also? The Zinc coating provides a smooth look as well h633-85 good anti-corrosive protection.
Different brands of chromate conversion chemistry, possibly different plating asttm acid zinc vs. Try using an acid zinc chloride bath and see if the casting covers.
The type of passivation is determined according to the required characteristics, and is divided into groups: Sorry, but if you need one particular look, you must go through the ugly process of maintaining sample boards with acceptable vs.
Rest in peace, Ken. Iron metals rust relative quickly, even in a non-corrosive environment. The designer and engineer must take into account several considerations to stay at the forefront of the finish potential.
To determine the nature of accuracy or revision level please verify above data with current releases: The rust not only harms the aesthetically smooth look, but also its mechanic needs.
Olive green and Black passivation is thick and has high electrical resistance. Our plater said that he would be willing to go thicker on the clear. Thank you for your hard work which the finishing world continues to benefit from. Please forgive any resultant repetition or failures of chronological asstm.
We are getting poor coverage on the as-cast surface of some steel castings using a yellow Zinc chromate.
ASTM B – 85e1 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
I am not getting the difference between this. Corrosion Resistance Requirements Types. It’s not possible to diagnose a finishing problem or the hazards astmm an operation via these pages. Supplementary treatments shall be in accordance with Recommended Practice B A Blue with pale yellow is the best replacement for yellow as of now.
Our Zinc coating is carried out according to: