RoHS and REACH Compliance in Electroplating: A Practical Guide • Platinex Industries

If you are manufacturing products for export to the European Union, North America, or increasingly, for domestic Indian OEMs, your surface finishing specifications must be compliant with global environmental directives. The two most critical frameworks are RoHS (Restriction of Hazardous Substances) and REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals).

For procurement and design engineers, specifying “RoHS Compliant Plating” is easy. Actually ensuring that the plated components received from your supply chain meet the strict chemical limits of these directives requires understanding exactly what is restricted and how plating chemistry has evolved to adapt.

RoHS in Electroplating: The Heavy Metals Ban

The RoHS Directive (currently 2011/65/EU, often called RoHS 2, with amendments like RoHS 3) restricts the use of specific hazardous materials in electrical and electronic equipment.

For the electroplating industry, the primary concern lies with four restricted heavy metals:

Lead (Pb): Limit < 0.1% (1000 ppm)
Cadmium (Cd): Limit < 0.01% (100 ppm)
Mercury (Hg): Limit < 0.1% (1000 ppm)
Hexavalent Chromium (Cr⁶⁺ or Cr(VI)): Limit < 0.1% (1000 ppm)

The Cadmium Challenge

Cadmium plating offers exceptional corrosion resistance, natural lubricity, and solderability. However, due to its extreme toxicity, it is strictly banned under RoHS (except for very narrow aerospace/military exemptions). The Compliant Alternative: Zinc-Nickel alloy plating (12-15% Ni) or Zinc flake coatings.

The Hexavalent Chromium (Cr⁶⁺) Challenge

This is the most widespread compliance issue in plating. Historically, the protective passivation layer applied over zinc plating (the “chromate” layer that gives zinc its yellow, olive drab, or black color) relied heavily on hexavalent chromium. Cr⁶⁺ is highly effective at preventing white rust, but it is a known carcinogen.

The Compliant Alternative: Trivalent Chromium (Cr³⁺) passivation. Modern chemistry has advanced so that thick-film trivalent passivations (often sealed with topcoats) now meet or exceed the corrosion resistance of legacy hexavalent chromates.

Note: The actual zinc layer is unaffected by RoHS; the restriction applies solely to the chemical conversion coating (passivation) applied on top of the zinc.

The Lead in Electroless Nickel Challenge

Historically, lead (along with cadmium) was used as a trace stabilizer and brightener in Electroless Nickel (ENP) baths. The Compliant Alternative: Modern RoHS-compliant ENP baths use heavy-metal-free stabilizers (often organic compounds or bismuth). You must explicitly specify “Lead-free/RoHS Compliant Electroless Nickel” when ordering.

REACH in Electroplating: Beyond the Final Product

While RoHS restricts what is in the final product, REACH applies to the chemicals used in the manufacturing process inside the European Union (and dictates what can be imported).

REACH maintains a list of Substances of Very High Concern (SVHC). If an SVHC is present in an article above 0.1% by weight, manufacturers must notify customers and provide safe handling data.

REACH and the Plating Process

The biggest impact of REACH on plating involves Chromium Trioxide (Chromic acid), which contains Cr⁶⁺. This is the primary chemical used in:

Hard Chrome Plating
Decorative Chrome Plating
Etching of plastics prior to plating (Plating on Plastics/POP)

Under REACH Annex XIV, the use of Chromium Trioxide requires specific authorization. This is driving a massive industry shift toward Trivalent Chrome electroplating for decorative applications and intense research into HVOF thermal spray alternatives for Hard Chrome.

However, it is crucial to understand the difference between the process and the product: If a part is Hard Chrome plated, the final metallic chrome deposit on the part is zero-valent chromium (Cr⁰), which is completely safe and compliant. The regulatory burden of REACH falls primarily on the plating facility managing the toxic Cr⁶⁺ baths, not necessarily on the end-user of the steel shaft.

How to Specify and Verify Compliance

If your product requires RoHS/REACH compliance, you cannot rely on verbal assurances from your plating supplier. You must document and verify.

1. Drawing Specifications

Update your engineering drawings to explicitly ban restricted substances.

Bad Callout: “Zinc Plate, Yellow Chromate” (Implies legacy hexavalent chemistry).
Good Callout: “Zinc Plate, Trivalent Yellow Passivate, RoHS Compliant per Directive 2011/65/EU.”

2. Requesting a CoC

For every batch (or as an annual blanket certification), require a Certificate of Compliance (CoC) from your plater explicitly stating that the finishes provided contain less than the maximum allowable limits of Pb, Cd, Hg, and Cr⁶⁺.

3. Independent Testing

For critical export assemblies, large OEMs will periodically send plated samples to independent laboratories (like SGS or TÜV) for ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry) testing to verify that Cr⁶⁺ and Lead are below the 1000 ppm threshold.

Platinex’s Commitment to Compliance

At Platinex Industries, we recognized the global shift toward environmentally responsible surface finishing early on.

100% Trivalent Passivation: We do not operate any hexavalent chromate baths for our zinc and zinc-nickel lines. All clear, yellow, and black passivations are Cr³⁺ based and fully RoHS compliant.
Lead-Free Chemistry: Our electroless nickel and tin plating lines utilize modern, heavy-metal-free stabilizers and brighteners.
Documentation: We provide comprehensive Certificates of Compliance for OEMs exporting to EU and US markets.

Need a reliable partner for RoHS and REACH compliant electroplating in Nashik? Contact the Platinex engineering team to review your specifications.