Fengfan Acid Zinc Plating Electroplating Chemicals Sulfate For Thin Steel Sheet SZ-88

Product Overview

Sulfate acid zinc electroplating on thin steel sheet is a different job from plating wire or heavy fabrications, and this additive is built for that job. The bath is the zinc sulfate route: an acidic solution held at pH 2–3 and 40–50 °C, where the zinc comes from dissolved zinc sulfate and the additive does the work of keeping the deposit smooth, bright and ductile.

It is supplied as two liquids — an additive and a make-up agent — dosed separately, so the brightener balance and the bulk bath chemistry can be corrected independently. On a line that runs the same sheet for weeks, that separation is the difference between topping up what the bath actually needs and adding a bit of everything and hoping.

Where these electroplating chemicals earn their place is downstream of the tank. Thin sheet usually gets formed after plating: bent, drawn, rolled. A brittle zinc layer cracks or lifts at the bend and the part is scrap. This bath plates a tough, ductile layer that follows the steel through the forming step, which is why it sits on coil and sheet lines feeding appliance panels, automotive brackets and electronic housings rather than on decorative trim.

It is one of three sulfate zinc products we supply: a general-purpose grade for mixed work, a wire grade for high-carbon steel wire, and this one for thin sheet at speed. If your line already runs acid zinc plating chemicals of the sulfate type, moving to this grade is a bath adjustment rather than a new line — confirm the make-up with our team before the first drum goes in.

In any metal plating process the deposit is only half the story; the other half is whether the bath holds its balance shift after shift. That is the part this product was formulated around.

Performance Advantages

• A deposit that stays bright and bonded. The zinc layer comes out smooth and silver-bright with good adhesion to the coating film, so parts look finished when they leave the tank instead of needing a polish.
• Ductility for the forming step. The deposit has the toughness to go through deep drawing and secondary forming without cracking or peeling — the failure that shows up as a hairline crack or a lifted edge after the press.
• Current density headroom. The bath tolerates a high cathode current density and opens up further as line speed and temperature rise, which is what lets a fast strip line in the process of electroplating thin sheet run without throttling back.
• A bath that holds its balance at throughput. Zinc sulfate, additive and make-up agent are controlled separately, so the solution keeps its equilibrium when the electroplating line runs hard rather than drifting until the deposit dulls.
• Dosing that follows production. Consumption tracks ampere-hours rather than the calendar, so the chemical bill follows output instead of sitting on a shelf. For plating chemicals bought by the drum, that is the number worth tracking.
• No line rebuild. It is formulated for sulfate zinc chemistry, so tanks, rectifiers, filtration and anode sets carry over; what changes is the make-up and the control settings for the metal plating process.

Bath Composition & Parameters

Applications

• Coil and sheet lines running continuously. Thin sheet is plated and sent straight to a press; the deposit has to be finished when it leaves the tank, not after a polishing step.
• Thin-gauge steel plating before forming. Appliance panels, enclosure shells and brackets are bent or drawn after plating, and the bend is where a brittle deposit fails first.
• Electronic housings and shielding parts. A smooth, silver-bright finish matters as much as the zinc layer itself, and the sheet is often thin enough that a rough deposit shows through the paint.
• Job shops with mixed thin-sheet work. One bath handling different part shapes and gauges without a changeover keeps the plating process running and the solution stable.
• Lines converting from another brand of acid zinc plating chemicals. Where the tank, rectifier, filtration and anodes stay put and only the make-up is rebalanced to the new additive.
• Electroplating shops quoting formed parts. When the customer's drawing calls for a bend after plating, the ductility of the deposit decides whether the job can be quoted at all.

Deposit Quality & Test Notes

Deposit claims are only worth the test behind them, so here is what this product tells you and what it leaves to your own trial.

What the bath is designed to give you is stated plainly: a smooth, silver-bright zinc layer with good adhesion to the coating film, and enough toughness to go through deep drawing without cracking or peeling. Those are the properties the formulation is built around, and they are what a coupon should show you.

What it does not give you is a salt-spray figure. Corrosion results on plated thin sheet depend on coating thickness, substrate condition, what happens after plating and the test method your customer specifies — a number printed on a product would say very little about your part. Electroplating chemicals are judged on the part, not on the drum. Send us your acceptance criteria and we will tell you which data applies to this item.

The practical check runs on your own material. Plate a coupon of the same gauge at your line speed, measure the coating where the part will be formed, then bend or draw it the way production will. If the zinc holds at the tightest radius, the bath is set correctly. If it does not, look at coating thickness and bath balance before changing anything else.

That approach is standard for the process of electroplating thin sheet, and it is why we would rather agree a control method than publish a claim: the variables in a metal plating process — gauge, speed, thickness, forming radius — belong to your line, not to ours. Send the coupon result and your bath analysis and we will tell you which of those variables to move. For steel plating where the part is formed after coating, that conversation usually settles the question faster than another specification sheet.

Bath Make-Up & Control

1. Analyse the bath you have before changing anything in the plating process — zinc sulfate concentration, pH and temperature show how far the existing solution sits from the working window.
2. Dissolve the zinc sulfate in warm water, let the insolubles settle and filter before the solution goes into the tank; sediment carried into the bath reappears later as roughness.
3. Add the make-up agent first and circulate, then add the additive; dosing them the other way round makes the brightener balance harder to hold in the process of electroplating.
4. Bring the bath up to temperature and trim the pH back into the working band; both drift as the line runs and both move the deposit.
5. Set line speed and current density together — a current density the speed cannot support gives a burnt or dull edge long before it gives extra throughput.
6. Plate a trial panel, check appearance and adhesion, then start production and log additive and make-up additions for the plating chemicals against ampere-hours, so the next top-up is a calculation rather than a guess.

Documentation & Safety

Ordering & Delivery

1. Confirm the grade and the volume with the sales team — the minimum order quantity varies by chemical and is confirmed with our sales team per order.
2. Choose the packing that suits your line: 10 kg/box; 25 kg or 50 kg/bag; 20 kg/25 kg/30 kg/200 kg/drum; 1000 kg/IBC drum. Electroplating chemicals ship in these standard packs unless your contract specifies otherwise.
3. Payment for a standard order is 100% T/T in advance; regular customers buying at fixed intervals follow the terms agreed in the contract.
4. Production lead time is 2 weeks from confirmation.
5. Shipping is arranged per the terms agreed in the current contract.
6. After delivery an inspection certificate is issued stating the batch number and warranty period.

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.

FAQ