Fengfan CAS 89-98-5 OCBA O-Chlorobenzaldehyde Acid Zinc Electroplating Brightener

Product Overview

OCBA is ortho-chlorobenzaldehyde — 2-chlorobenzaldehyde on a specification sheet — and it is unusual among metal plating raw materials in having two entirely separate buyers. A zinc plating shop adds it in milligrams per litre to change how a deposit looks. A synthesis plant charges it into a reactor as a starting material. Both are buying the same thing: a clean, high-purity aromatic aldehyde that behaves the same way every time a container is opened.

In the tank it is the brightener. Added at a very low concentration, it lifts the reflectivity of the zinc deposit in an acid zinc electrolyte and helps the coating build evenly across the part, including threads, radii and blind holes. It sits alongside the carrier, the emulsifier and the purifier — the rest of the acid zinc plating chemicals that keep a chloride zinc line running — and it changes the finish rather than the sequence: preparation, plating and passivation stay as they are.

On the bench it is a building block. The aldehyde group and the ortho chlorine give two reactive handles in one molecule, which is why the same liquid appears in routes to pharmaceutical, pigment and agrochemical intermediates, and why we quote it to formulators as readily as to plating shops.

One thing worth settling early, because it comes up in almost every enquiry: where this product sits in the process of electroplating is narrow — one addition to the zinc bath — and the electroplating vs electroless plating distinction puts it firmly on the electrolytic side. It is not an electroless additive.

It is supplied as a liquid and stores in a cool, dry place with the container kept closed.

Specifications

Performance in Acid Zinc Plating

• Brightness across the whole part. The aldehyde lifts the reflectivity of the zinc deposit on flat faces, edges and radii in the same pass, so the finish the customer sees is the finish the inspector measures rather than a highlight on one area.
• Even build into threads, recesses and blind holes. Brightness is worth little if it stops at the outside of the workpiece. Run with a carrier, the brightener helps the deposit reach the geometry that normally starves in a zinc bath, so a mixed rack comes out looking like a single job.
• Adhesion that survives passivation and handling. A zinc layer still has to take a chromate or a trivalent passivation, a seal and the knocks of handling without blistering or flaking. A well-bonded, bright deposit is the one that comes through those steps intact, which is why a plating process is judged as a whole rather than on the bath alone.
• Thickness without a dull finish. When a job calls for a heavier zinc layer, plating time goes up. The brightener keeps the appearance consistent as the deposit builds, so thickness and appearance stop competing.
• Corrosion results decided at the surface. A clean, even zinc surface accepts a passivation film uniformly, and that film is where most of the salt-spray result is actually settled.
• A small addition, not a major cost line. At the recommended addition a 1,000 L bath takes well under a kilogram of product, so the brightener never dominates a bath make-up — the carrier, the zinc source and the rest of the acid zinc plating chemicals do.
• Built for the system around it. Aldehyde brighteners have to be dispersed to reach the workpiece evenly, so they are run with a carrier and a surface active agent. Our carriers for chloride zinc are formulated to emulsify and disperse this aldehyde, which is why the two are normally bought together.
• Rack and barrel alike. The same product is used on jigged work and in barrels in acid zinc electroplating; what changes between the two is the addition and the agitation, not the material.

Use Scenarios

Automotive aluminum parts. Brackets, trim and small castings on automotive programs need a bright, even zinc layer that still meets the appearance and corrosion checks the end customer set. Builders in this sector are the strictest on adhesion, because a coating that lifts at a bend or a clinch is a line stoppage rather than a cosmetic issue. On aluminum the deposit is only as good as the pre-treatment beneath it, so we ask for the full plating process sequence when an enquiry comes in.

Electronics and precision metal plating. Contacts, housings, shielding cans and small machined parts — often barrel-plated in high volume — where brightness and a consistent deposit thickness matter more than the weight of metal laid down. Parts with complex geometry are the usual reason a shop moves up from the bottom of the addition range toward the top of it.

General hardware, fasteners and builders' fittings. The classic chloride zinc job: high volume, a broad mix of part shapes and a finish the end customer will actually look at. Brightness is the visible result; evenness across a mixed load is the practical one.

Job shops starting or converting an acid zinc bath. Shops in this position have usually already settled the electroplating vs electroless plating question — they want a zinc layer, not a nickel-phosphorus one — and what they need from us is the addition figure that produces a bright deposit on their own part mix. That is a conversation, not a catalogue line.

Synthesis and formulation customers. The same material also feeds reactors rather than tanks: pharmaceutical, pigment and agrochemical routes where the aldehyde is a starting material rather than an additive.

Synthesis Intermediate Role

• Pharmaceutical intermediates. 2-Chlorobenzaldehyde is a starting material in routes to active ingredients and fine chemicals, where the consistency of the aldehyde from lot to lot matters as much as its headline purity.
• Pigment manufacture. Used as an organic synthesis intermediate in pigment production, where the ortho chlorine is carried through the route rather than stripped off at the first step.
• Agricultural pesticides. Also specified in agrochemical synthesis, where the same two functional groups are the reason the material is chosen.
• Two reactive handles in one molecule. An aldehyde group and a chlorine on the same aromatic ring let condensation and substitution chemistry run off a single starting material instead of two.
• The assay is the specification that matters here. A synthesis route is planned around the figure on the sheet; a lot that runs under it changes the stoichiometry of everything downstream, which is why we quote the assay rather than describing the material as pure.
• What to send with an enquiry. The route you are running, the purity you need and the solvent system you work in. Those three tell us whether the standard material fits, or whether the conversation needs to go further before a drum is booked.

Dosing, Additions and Bath Control

1. Fix the starting point on a Hull cell. The working range is 50–150 mg/L, and a new or converted bath in the process of electroplating is normally opened at the bottom of it and raised in steps once you can see how your own parts respond.
2. Disperse before you dose. Run the brightener in with the carrier and surface active agent rather than tipping it straight into the tank; the aldehyde, like the rest of the acid zinc plating chemicals, has to be emulsified through the bath to reach the work evenly.
3. Add slowly, with agitation running. A fast addition creates a local concentration the bath cannot absorb, and the result shows up as streaking instead of brightness.
4. Watch the carrier balance, not only the brightener. If brightness falls away, the answer is not always more aldehyde — a carrier running low will mask the effect of the brightener entirely.
5. Keep a log of what went in against what came out. Record the addition and the Hull cell panel or the production parts that followed; your own record of the plating process is a more reliable guide to the next dose than any table.
6. Filter and keep the bath clean. Brightness is the first thing organic contamination takes away, and a bath that is filtering properly needs less correction.
7. Store the container correctly. Cool, dry and closed — this is a liquid aldehyde with a pronounced benzaldehyde odour, and it should not sit open in a warm metal plating shop.

Ordering and Delivery

Related Process Chemicals

• SZ-30B — brightener for sulfate zinc plating, for lines running a zinc sulfate electrolyte instead of a chloride one.
• ZN 50 — alkaline non-cyanide bright zinc for rack and barrel, when the part mix calls for alkaline rather than acid chemistry.
• ZN-500 — cyanide-free alkaline zinc brightener with a wide temperature window, for shops that need to run their baths hotter.
• Phoenix EB 204A-204B — divalent tin electrolytic coloring additive for anodized aluminum, one step further along a different line.
• Phoenix Seal 149-L and 149-T — middle- and medium-temperature nickel acetate sealers for anodized work.
• FI-970 — bright acid copper process, for a copper layer beneath nickel or as a finish in its own right.
• FF-4219 — water-based nano protection for wood, stone and concrete, outside the plating line entirely.
• Nickel Purify P3 — bath treatment for bright nickel when copper, zinc, iron or chromium impurities build up.
• FF-116 — chrome mist inhibitor for chromium plating lines, dosed at grams per litre to control mist at the tank.

Technical Support & Model Matching

Choosing the right match is where most sourcing decisions stall. As a trading supplier, we keep one point of contact from first enquiry to after-sales: tell us what you are making and the conditions you work under, and we shortlist the closest matches from our supplier network, compare specifications and arrange samples before you commit to a bulk order. If something does not behave as expected, we work with the supplying partner on the cause and a practical fix, and stay with the case until it is settled. Email, WeChat or WhatsApp enquiries get a reply within 24 hours.

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