Fengfan CAS 140-07-8 THEED ZINC NICKEL ALLOY PLATING INTERMEDIATE N,N,N',N'-Tetrakis(2-Hydroxyethyl)Ethylenediamine

Product Overview

THEED is a light yellow to orange yellow viscous liquid: an ethylenediamine backbone carrying four hydroxyethyl groups, with a molecular weight of 236.31. We supply it at an assay of ≥90.0% and a pH of 8.0–10.0 measured on a 1% aqueous solution, and it ships as a standard intermediate in our coating production chemicals range.

It is an intermediate, not a finished process. Plating shops dose it into a zinc-nickel electrolyte to influence how the alloy layer forms; resin producers use it as an initiator in polymer synthesis; ink makers list it among the components of pen and oily pen ink compositions. What those three uses share is the chemistry: a small, non-ionic molecule with four hydroxyl groups that goes into water-containing systems and behaves as a surface active agent without adding ionic load. Because the grade is specified on a 1% aqueous solution, it disperses readily into a bath or a formulation rather than sitting on top of it.

Specifications

Function in Zinc-Nickel Plating

• In the bath, not on the surface: the grade is dosed into the zinc nickel plating electrolyte as an intermediate. It works at the boundary between the steel and the growing alloy layer, which is a different job from the brightener that sets the cosmetic finish.
• Adhesion as the first effect: the hydroxyl-rich molecule adsorbs on the substrate and gives the incoming zinc-nickel layer a surface to bond against. That interface is where blistering and edge flaking begin when it goes wrong.
• Non-ionic, so it stays out of the way: it adds no charge to the bath and does not compete with the brightener package or the carriers already in the tank. A jar test with your current additives is still the right first check.
• A component, not a process: formulators treat it as one of the plating chemicals that shape the deposit's structure, alongside the wetting agents and the alloy source. It does not set brightness.
• Where it does not apply: it belongs in the electrolyte, not in the sealing or passivation tank, and it is no substitute for the cleaning and activation steps ahead of plating.
• Supplied as an intermediate within our coating production chemicals line: something you build into a bath or a formulation, not a ready-to-run package.

Deposit Durability in Service

Zinc-nickel plating earns its place where a plain zinc layer will not last: fasteners, brackets, housings and fittings that see road salt, repeated cleaning and heat. The alloy layer is only as good as its grip on the steel underneath, and that grip is what this intermediate works on. By strengthening the bond at the interface, it reduces the two failures that cost platers most — blistering after machining or forming, and flaking at edges and threads where the deposit is thinnest. Parts plated with it keep their protection through handling, assembly and thermal cycling instead of failing at the first knock.

The effect on the plating process is commercial as much as technical: fewer rejects at final inspection, less rework at the polishing or assembly stage. It also makes the durability claim defensible. Where a part has to pass a salt spray requirement or a bend and impact test, the whole stack is being judged — pretreatment, alloy layer, passivate — and the intermediate is the part of that stack that decides whether the alloy layer stays where it was put. Verify it on your own acceptance test rather than on a data sheet sentence: plate a trial panel, check adhesion and salt spray, then scale.

Adding It to the Bath

1. Confirm the level and the point in the cycle with our technical team before you open the drum. The figure depends on the volume of your zinc-nickel plating bath, the alloy you are targeting and how the line is currently running.
2. Treat the addition as you would any other step in a metal plating process: gloves, eye protection, working ventilation, and a pump or ladle kept for this product alone.
3. Pre-dilute in water before it goes in. The liquid disperses readily, but adding it neat to a hot bath is what causes local over-concentration and streaks on the first parts through.
4. Weigh the addition rather than measuring by eye. A viscous liquid clings to a jug, and weighing is the only way to keep one addition comparable with the next.
5. Record the drum batch, the weight added and the bath pH before and after the first addition, then run a normal cycle before you judge the result.

Coating Thickness and Coverage

• Coverage where it is hardest: recesses, internal threads and the low-current areas of complex parts are where uneven deposition shows up first. In zinc nickel plating, an intermediate that steadies the interface helps those areas fill out with the rest of the workpiece.
• Fewer patchy deposits: when the layer builds evenly, the mottled, thin-in-one-corner finish that forces sorting and rework becomes rarer.
• Repeatable from one run to the next: a defined assay and a defined pH window mean this month's addition behaves like last month's, which is what keeps a plating process inside its thickness tolerance.
• What to measure: coat a trial panel, read thickness at high- and low-current-density positions, and compare against the intermediate you use today before changing a whole tank.
• Carries downstream: even coverage gives the passivate or the assembly step a consistent surface, so cosmetic rejects fall further along the metal plating process as well.

Polymer Synthesis and Ink Uses

The technical data sheet names two applications that have nothing to do with a plating tank. The first is polymer synthesis, where this grade is used as an initiator in resin production. The second is pen and oily pen ink compositions, where it is one component of the liquid phase. Neither is an afterthought to the plating use: they are the applications the data sheet lists first, and they are why the grade is also stocked by formulators who never run an electrolyte.

In a resin or ink system the useful part of the molecule is the same one that works in a bath — a small, non-ionic surface active agent with four hydroxyl groups, soluble enough to go into water-containing and polar systems without a coupling solvent. What the molecule cannot tell you is the dose. The level, the order of addition and the compatibility with your resin, vehicle or pigment dispersion are set by your own formulation, so they are confirmed on a trial rather than quoted from a table.

If you already buy coating chemicals from us for other production lines, this is one more intermediate that arrives with its own technical data sheet and its own batch record. Tell us which system you are building and we will confirm whether this grade is the right starting point before you commit to a pack.

Product Advantages

• A specification you can act on: assay ≥90.0% and a pH window of 8.0–10.0 on a 1% solution give incoming inspection real numbers to check, which is more than most intermediates in our coating production chemicals range offer.
• Fewer line items to hold: because the grade is documented for plating, polymer synthesis and ink work, a distributor or a plant with more than one process can consolidate onto a single intermediate.
• No solvent carrier: it is non-ionic and goes into water-based systems directly, so there is nothing to strip off and no ionic load added to a bath.
• Built on a long supply history: Fengfan has worked in surface finishing since 1984, with production in Wuhan and 3,000–5,000 t of annual capacity behind the range, so this is a repeatable line rather than a one-off import.
• Sits inside a full programme: the intermediate can be specified alongside the other coating chemicals we supply — zinc processes, trivalent passivates and post-treatments — from one supplier and one documentation trail.

Handling and Storage

1. Store drums closed in a cool, dry place, out of direct sun and away from heat. The grade does not need temperature-controlled storage beyond that.
2. Wear gloves and eye protection when decanting. A 1% solution sits at pH 8.0–10.0, so the neat liquid is mildly alkaline — keep it off skin, out of eyes and away from acid.
3. Use a drum pump or a ladle kept for this product. It is viscous and clings to the drum wall, so give it time to drain instead of scraping the last of it out.
4. Absorb spills and rinse the area with water. No solvent is needed, and the rinse belongs in the same effluent stream you use for your other coating chemicals.
5. Keep the batch label on the drum and log the batch in your records. As with any of the plating chemicals you run, traceability is what lets a coating fault be traced to a lot instead of the whole tank.

Ordering and Delivery

Tank Trial Protocol

1. Check the drum label before it goes near a tank: confirm the product name on your order — THEED, zinc-nickel alloy plating intermediate — then verify assay ≥90.0% and pH on a 1% aqueous solution against the 8.0–10.0 window, and record the batch number. Retain a small sealed sample with that number.
2. Fix the baseline first. Record the current bath composition, temperature, current density and the adhesion and thickness results from a control panel plated with the intermediate you use today. Without that baseline, a trial only shows that two drums differ, not which one suits the job.
3. Run the trial in a small volume of the same working electrolyte rather than a freshly made bath, so the result reflects the production bath your parts actually see. Confirm the starting addition with our technical team; the level depends on bath volume, alloy target and the other plating chemicals already in the tank.
4. Plate panels across the current-density range you run — a low-current recess, a flat face, and an edge or thread — and keep one unplated panel as an appearance reference.
5. Test the properties the part is sold on: adhesion after a bend or thermal shock, coating thickness at high- and low-current positions, appearance after passivation, and salt spray where that is on the drawing. Compare each result with the baseline panel, not with a catalogue claim.
6. Move to a production tank only after the small-volume trial repeats on a second run. Change one tank, keep the rest of the line on the current intermediate, and hold the first production parts for the same checks before releasing them.
7. Log the batch number, weighed addition, pH before and after, panel results and any adjustment. If a drum falls outside the assay or pH window, stop and contact us before dosing; the inspection certificate issued after delivery ties the batch number to its warranty period.

Environmentally Compliant and Safe to Handle

THEED is a non-toxic, non-ionic surfactant developed with environmental safety in mind. It is formulated to align with international environmental standards, helping reduce risks to operators and surrounding ecosystems while supporting compliance with global regulatory frameworks. For companies introducing chemical coating products into their processes, this makes THEED a dependable choice; for buyers working with an industrial coating supplier, it offers the assurance that the chemical can be managed safely without compromising safety standards. Defined packaging and storage guidelines further support reliable handling in both laboratory and large-scale industrial settings. In use, THEED is suited to zinc-nickel alloy electroplating, where its performance and handling profile come together with a balance of functionality and responsibility.

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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