Fengfan Semi - Nickel Plating Additive Corrosion Resistant Well Semi Nickel MAX SA

Product Overview

A semi-bright nickel additive for the first layer of a multilayer nickel deposit. The chemistry is sulfur-free: the semi-bright layer forms directly on steel, brass or copper, and a bright nickel layer is plated over it to complete the stack. The pair is built around one property — the potential difference between the two nickel layers — held steady from part to part and from bath to bath, because that gap is what decides how the finished coating behaves once it is scratched, drilled or bent. Platers bring it in as the nickel plating intermediate in decorative and protective stacks, and as the base for the bright nickel, precious-metal or zinc-nickel stages that follow. It arrives as a matched set — MU, brightener, potential-difference regulator and wetting agent — dosed into a sulfate–chloride nickel bath with air agitation. Layers come out semi-bright, well levelled and ductile, with low internal stress.

Product Advantages

• The potential gap is a component, not a side effect. A dedicated regulator ships with the set, so the difference between this layer and the bright nickel above is changed on purpose instead of drifting with every nickel plating brightener addition.
• Sulfur-free chemistry keeps the bath cleaner. With no sulfur-bearing breakdown products building up in the solution, the bath stays workable for longer and needs less frequent treatment.
• Ductility where the part is handled next. Low internal stress and good ductility let the layer survive polishing, bending and assembly rather than failing at the first forming step.
• A wide window for real production. Concentration, temperature and current density ranges are broad enough that a line with a changing load and a mixed part mix keeps running inside specification.
• Levelling that takes work off the polishing bench. The semi-bright layer fills and smooths before a bright nickel plating layer goes on, so less mechanical finishing is needed to reach the final appearance.
• One schedule for steel, brass and copper. Steel plating jobs, brass fittings and copper components can share the same bath and the same working window, which simplifies a line that switches substrates through the week.

Formula & Operating Conditions

Layer Stack & Corrosion Path

1. The semi-bright layer goes down first, directly onto the cleaned steel, brass or copper part. This is where electro nickel plating starts in a multilayer stack, and it is the layer that carries adhesion to the substrate.
2. Bright nickel plating follows over it. The bright layer supplies the gloss and the reflectivity the finished part is judged on.
3. The two layers differ in potential, and the regulator in this set holds that difference steady. When the coating is damaged, the attack runs sideways through the semi-bright layer rather than straight down to the substrate — which is why a duplex or triplex stack outlasts a single bright layer of the same total thickness.
4. A ductile, low-stress layer also stays continuous around radii and in recesses, where a stressed deposit would thin out or craze and leave the substrate exposed.
5. The top stages follow as the job requires — chromium, a precious metal or a zinc-nickel layer — each one landing on a level, semi-bright surface that takes the next deposit evenly.

Substrates & Applications

• Automotive and machinery parts in steel. Brackets, fasteners and housings that are bright-nickel plated and then run outdoors, where steel plating has to keep its corrosion performance through stone chips and road salt.
• Brass and copper hardware. Sanitary fittings, decorative trim and electrical components, where the usual failure is adhesion onto the brass rather than the corrosion resistance itself.
• Job-shop work with a mixed part mix. A nickel plating company running steel, brass and copper through one line can hold a single additive set and a single schedule instead of swapping chemistry between jobs.
• Electronics and appliance trim. Components that go through electro nickel plating before a decorative top coat, where a fine, level surface under the bright layer cuts polishing and rejects.
• Heavy machinery and construction hardware. Parts that face weather, abrasion and repeated assembly, and where the coating has to keep working after the part has been handled and bolted.
• The layer below zinc-nickel or precious-metal finishing. When a part needs more than one functional layer, this is the nickel plating intermediate that gives the next deposit something even and well bonded to sit on.

Bath Control & Maintenance

1. Start from a clean sulfate–chloride nickel bath and verify the nickel, chloride and boric acid levels before the additive set goes in; carry-over from earlier stages is the usual reason an electro nickel plating bath produces a dull semi-bright layer.
2. Add the wetting agent and set the air agitation so the solution moves evenly across the rack. Uneven flow shows up as streaks and patches in the semi-bright layer long before it disturbs the bright layer above.
3. Place the potential-difference regulator before chasing brightness. When levelling or colour drifts, the cause is more often the regulator than the nickel plating brightener, and topping up brightener alone shifts the gap you were trying to hold.
4. Hold pH and temperature inside the working window across the shift. The semi-bright layer reacts to pH drift faster than the bright layer that follows it.
5. Filter continuously and keep the anode area clean — levelling is most consistent when the solution is free of suspended solids.
6. Pull a bright-nickel test panel from each batch and compare it with the previous one. A shift in colour or in the potential gap appears on the panel before it reaches production parts.

Fengfan Background & R&D

Fengfan has worked in electroplating additives since 1984. Wuhan Fengfan International Trade Co., Ltd is the wholly owned trading subsidiary of Wuhan Fengfan Electrochemical Technology Co., Ltd, and the chemistry behind this additive is developed and produced by the parent company rather than bought in — which is what a nickel plating company is really paying for when a bath problem will not yield to a catalogue product. The parent company's Fengfan Tech Park in Wuhan's Dongxihu District covers about 67 acres with roughly 7,000 m² of floor space and operates under clean-production verification, safety-in-production standardization, 6S scene management and a classified logistics system. It holds a seat on the Science Technology Commission of the China Surface Engineering Association as vice-chairman of the electric plating commission. Its former chief engineer, a professor-level senior engineer, has published more than 100 technical papers, holds more than 20 patents and has written more than 20 books on electroplating. A dedicated R&D facility runs green electroplating research and a pilot test laboratory, where bath trials are worked out before a formulation goes onto a customer's line.

Ordering & Delivery

Line Fit & Verification

1. Rack lines are the documented case. With pH 3.5–4.0, 50–60 °C and a cathode current density of 2.0–6.0 A/dm² under air agitation, the semi-bright layer goes down as specified, using the same control you already apply to a nickel plating brightener bath.
2. Barrel work is qualified on your own drum, not assumed from the rack range. Inside a barrel the current path, contact resistance and solution exchange all differ, and the result depends on your load weight, drum perforation and rotation speed as much as on the additive.
3. Run the first barrel load at the same pH, temperature and metal content as your rack bath and put a rack panel through beside it. Compare the two on colour, levelling, coverage in blind holes and adhesion after a 90° bend.
4. Read barrel defects correctly. Contact marks where parts touch each other or the drum, and dull patches in the lowest-current areas, are load and distribution issues — change barrel load and current density before you change dosing.
5. Thickness comes from time and current density, not from the additive. Agree the layer thickness with your customer first, then set plating time from your own measured deposition rate and check it on a coupon rather than a table.
6. Appearance is judged as semi-bright: even, well levelled and free from pitting, streaks and haze, so that the bright nickel plating above develops its gloss on a surface that is already flat.
7. Corrosion results belong to the finished stack. Test finished steel plating panels by the salt-spray method your drawing or customer specifies, and record the nickel thicknesses alongside the result — a salt-spray figure without the layer thicknesses and test conditions behind it says very little about your part.
8. Know what it is not. This is the bottom layer of a multilayer system, not a stand-alone bright finish; a job that needs one bright layer belongs to a bright nickel process. A nickel plating company running both rack and barrel work should plan the barrel qualification before it quotes the barrel job.

Composition & Compliance

• The safety data sheet is issued for this product, not for a family of products. Ask your sales contact for the current version for your destination before the first delivery and keep it with the bath records; handling, spill response, disposal and transport classification all come from that sheet.
• Storage follows the sheet and your plant rules. Keep the containers closed in the designated chemical store and follow the sheet for temperature range, segregation and shelf life. Where a drum will stand for months, confirm the shelf life for that batch before it goes into a production bath.
• Declarations stay product- and market-specific. If your customer asks for REACH or RoHS documentation, give us the product name and the country of import so the statement matches the material you actually receive; one product's certificate is not extended to another.
• Written wording on cyanide and hexavalent chromium. Where your compliance file needs a declaration for this nickel plating intermediate, request it with the order and we will confirm in writing what applies to this product rather than a general statement.
• Dosing and handling at the bath. Additions are measured by volume against the working range and made into an air-agitated bath; keep drums closed between additions, and use gloves, eye protection and the local exhaust the sheet calls for.
• What we do not claim. No food-contact, pharmaceutical or medical-device approval is offered with this additive, and it does not replace your customer's finished-part approval — the electro nickel plating result on your line is what gets approved, not the drum.

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