What is ASTM B633?
The most common standard for zinc plating is ASTM B633, which has four classifications for electroplated zinc. Each classification specifies which supplemental treatment or chromate to apply (Type I,II,III,IV,V, or VI) and the plating thickness according to the type of environment (SC1, SC2, SC3 or SC4).
What is ASTM B633 Type V?
A. ASTM B633 covers 2 types of RoHS compliant (Hex Chromium free) plating, types V (colorless trivalent) & VI (colored trivalent). It also covers 4 standard services classes of thickness (SC 1 = 5 µm, 2 = 8 µm, 3 = 12 µm, 4 = 25 µm).
What color is ASTM B633 Type II?
Zinc Chromate Per ASTM B633-85 Type II Does the Type II in spec ASTM B633 [affil. link to spec at Techstreet] designate the color Zinc Yellow.
Is ASTM B633 RoHS compliant?
ASTM B633-11 now addresses RoHS compliance.
What is Type 3 zinc plating?
Applicable Industry Spec: ASTM B633, SC1, Type III. Scope – This includes electrodeposited zinc coatings as applied to steel, copper, brass, and bronze parts to protect them from corrosion. Steel parts requiring embrittlement relief after plating are baked according to industry standards.
What is the purpose of zinc plating?
Zinc plating is often used to provide a protective layer against water and other elements in the air that cause corrosion. Typically, a zinc coating is applied to iron and steel, as these metals tend to rust easily.
Does zinc plating add thickness?
The protection from the zinc plating is proportional to the thickness of the zinc plating – so thicker zinc means more protection for the base metal. Thickness has almost no effect on the resistance to “white rust” because this involves the coating itself corroding.
How thick should zinc plating be?
Plating Thickness – The zinc plating shall be a minimum thickness of . 0002 inch (5 µm) on all significant surfaces. Surfaces on which the specified thickness of deposit cannot readily be controlled, such as threads, holes, deep recesses, bases of angles, and similar areas, are exempt from the thickness requirements.
Why is zinc chromate banned?
REASON FOR CITATION * Zinc Chromate is on the Hazardous Substance List because it is regulated by OSHA and cited by ACGIH, NIOSH, DEP, IARC, HHAG and EPA. * This chemical is on the Special Health Hazard Substance List because it is a CARCINOGEN.
What is difference between trivalent and hexavalent zinc plating?
The key difference between trivalent and hexavalent zinc plating is that the trivalent zinc plating process has a high efficiency with a uniform distribution than the hexavalent zinc plating process. Zinc plating is a common process of protecting a wide range of materials. It can act as a sacrificing coat.
What is Type 1 zinc plating?
Type 1 (As Plated with no chromate conversion coating), Type 2 (With a colored chromate; Customer specifies the color, (Yellow, Olive Drab or Black), Type 3, (Clear or Blue bright), Type IV (Phosphate coating), Type V (Trivalent Clear or Colorless passivated), Type VI (Trivalent Yellow or Black, Color Specified by …
What are the types of zinc plating?
What follows describes each of them and their uses.
- Yellow zinc plating. This particular zinc coating is most seen in the automobile industry and offers a middle level protection against rust and corrosion.
- Blue/clear zinc plating.
- Black zinc plating.
- Acid zinc plating.
What is the thickness of zinc plating?
Does zinc plating rust?
Therefore, zinc-plated steel is naturally resistant to oxidation-related damage like rust and corrosion. There are different ways to make zinc-plated steel. One of the most common methods involves bathing the steel product in an electrolyte solution.
Does zinc clear rust?
The short to the question is, yes. Zinc does rust. Like all metals, zinc corrodes when exposed to air and moisture. However, this element does not rust like most other metals.
What color is zinc plating?
The normal zinc-plated coating is dull gray in color with a matte finish, although whiter, more lustrous coatings can be produced, depending on the process or agents added to the plating bath or through post-treatments.
Is zinc chromate a carcinogen?
* Zinc Chromate is a CARCINOGEN in humans. It has been shown to cause lung and throat cancer. * Many scientists believe there is no safe level of exposure to a carcinogen.
What is the ASTM b633 type II coating?
A. It’s pretty simple, ASTM B633 [link by ed. to spec at TechStreet] Type II coatings indicate a colored chromate; gold, black etc.; Type III coatings are colorless or clear chromate (iridescent okay).
How long does ASTM B 633 type II hexavalent last?
ASTM B 633 Type VI Black Hexavalent Coming Soon! X Up to 72 Hrs ASTM B 633 Type II Olive Drab Hexavalent X X Up to 96 Hrs ASTM B 633 Type II We also offer Zinc-Nickel Platingwhich provides up to 10 times the protection of conventional zinc plating. Industrial Zinc Electroplating Benefits Improve the corrosion resistance of your parts.
What does b633 stand for in chemistry?
Designation: B633−13 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel1 This standard is issued under the fixed designation B633; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
Are there any problems with b-633 chromates?
You are probably right that there may be some problems with B-633 in this age of proprietary trivalent chromates for RoHS standards, but it is a far better starting point than a blank sheet 🙂 A.
Is ASTM B633 Type II RoHS compliant?
What is black zinc plating?
Black Zinc Plating refers to the color of the chromate that is applied during the post plating process. It includes a layer of zinc applied to a parts surface followed by black chromate applied over the zinc. Black Zinc is commonly specified for its dark appearance and protective properties.
What is the difference between zinc yellow and zinc clear?
Yellow zinc is most commonly used for automotive parts because it provides a good level of corrosion resistance. Black zinc offers a little less corrosion resistance than yellow zinc. Blue or clear zinc plating provides the least amount of corrosion resistance.
.0002 inch
Plating Thickness – The zinc plating shall be a minimum thickness of . 0002 inch (5 µm) on all significant surfaces. Surfaces on which the specified thickness of deposit cannot readily be controlled, such as threads, holes, deep recesses, bases of angles, and similar areas, are exempt from the thickness requirements.
Is all stainless steel RoHS compliant?
Is stainless steel RoHS compliant? Yes. Although chromium is present in stainless steel, it’s not the hexavalent chromium restricted by RoHS.
What color is Zincplate?
In other words, the metal will have the silver color of zinc, often also including slight iridescence which can range from blue to yellow to pink. The use of different passivates can provide a wide spectrum of zinc finishes.
Will black zinc rust?
Black Zinc Provides mild corrosion resistance and a black finish. It is thicker than a Black Oxide finish, so on tight fitting parts be wary of this finish. If a stylish finish is required as well as corrosion protection this is a good option.
Clear chromate or passivate protects the zinc layer and offers additional protection against corrosion. This finish gives the part surface a silver appearance with a slight blue tint. Clear Zinc is a widely used finish across industries because it an economical solution for effective corrosion protection.
What is GSM in zinc coating?
Galvanized Sheet Metal (GSM) is a metal product that has a protective zinc coating to prevent rusting.
What is the difference between Cr3 and Cr6 plating?
It is challenging to set a Cr6 drinking water standard because these forms of chromium can convert back and forth in water and the human body, as well as under different environmental conditions. Cr3 is an essential micronutrient and has low toxicity. Cr6 is more toxic and is known to cause cancer when inhaled.
What’s the difference between hexavalent and trivalent?
Is 316 stainless steel RoHS compliant?
As a trusted 316 & 304 supplier, we supply fully certified and 100% traceable material that is ROHS compliant, ensuring the highest quality.
Is RoHS required in USA?
There are no federal restrictions in the US, but California has its own RoHS laws. These are set out in Health and Safety Code sections 25214.9-25214.10. 2 and the California Code of Regulations, Title 22, section 66260.202 and the Department of Toxic Substance Control (DTSC).