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).
|Country:||United Arab Emirates|
|Published (Last):||2 January 2004|
|PDF File Size:||9.83 Mb|
|ePub File Size:||19.97 Mb|
|Price:||Free* [*Free Regsitration Required]|
I’m not a zinc plater, but ‘Type II Clear’ seems self-contradictory. To calculate it is very difficult, as the plating is a few molecules thick. Sorry, but if you need one particular look, you must go through the ugly process of maintaining sample boards with acceptable vs. Put the chromate on light. Different brands of chromate conversion chemistry, possibly different plating processes acid zinc asm. The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments.
To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads astj the dialog you’re viewing. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
Colorless RoHS compliance passivation gives corrosion resistance ability of 72 hours according to ASTM B until white spots-also intended to parts used in a high corrosive environment —outdoor. High strength steels tensile strength b633-8 than MPa shall not be electroplated.
Surfaces left-bare should be heavily chromated. Olive green and Black passivation is thick and has high electrical resistance.
Perhaps some asmt with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III.
According to RoHS the homogeneous and non-homogeneous are defined in such manner that every one may understand that the layer is removable let’s see how. The coating is made according to demand, where the distribution is as follows: Our Zinc coating is carried out according to: Iridescent and Colorless passivation is thin and has low electrical resistance.
Zinc coating with colorless RoHS compliance passivation. ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent. What type of zinc plating bath is your plater using? How do you know if it is supposed to be Zinc Yellow or Zinc Clear? The exterior visual determined according to last layer. Hi, B633-85 recently received 2 batches of parts from two separate platers using this specification.
The problem may not be with the chromate at all.
That seems a bit discretional to me. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. Regards, Ted Mooney, P. You can get the same finish only for blue and black hex chrome with tri substitutes, but not for yellow or olive as of yet. The answer is Yes. Please forgive any resultant repetition or failures of chronological order. Some of today’s proprietary trivalent chromium coatings are very thin and consequently will not generate a highly saturated color though.
I have the exact same questions. August 31, A. Answer is based upon pre versions of B, The Standard default is gold for type II coatings unless otherwise specified. Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths. Can anyone give me some direction on how to get the customer to accept going to clear. The electrical resistance of this green layer passivation is very high because it is thick in relative to other passivations.
Decorative charastreistics The exterior visual determined according to last layer. Ken Vlach – Goleta, California.
ASTM B datasheet & applicatoin notes – Datasheet Archive
Corrosion Resistance Requirements Types. A heavy chromate will shear under paint and cause the paint to peel. Ray Kremer Stellar Solutions, Inc. The Zinc coating on the steel does not last shiny for long, and so a further thick layer coating is added, called passivation.
The astn is currently being produced in China and my local platers are suggesting a dye to get a blue color. Also, I found out that the casting is painted after plating.