Fine crystals before the phosphate bath
Steel dropped straight into phosphate grows coarse, dusty crystals that hold paint poorly. The Surface Conditioner from Winsir Decoration Materials Co., Ltd is a colloidal-titanium conditioner that plates the part with titanium nucleation sites, so the phosphate that follows starts on many small seeds instead of a few big ones and films out dense and fine.
The number it moves
A Foshan auto-parts trial measured the change: a phosphate grain of about 20 microns came down to about 5 microns, and salt-spray time rose by roughly 20%. That fine, even film also cuts sludge and smutting on the part, which is what the plating line sees as fewer rejects.
How it is run
The conditioner comes as a white powder or a pale-blue suspension, dosed at 0.1-0.2% powder or 2-5 millilitres per litre, run at room temperature and pH 8-9 for thirty to sixty seconds by spray or dip. Parts pass straight from it into the phosphate tank without an intervening wash, and the bath stays stable eight to twelve hours between top-ups.
Why it earns its place
Fine-grain film bites the coating harder, so cross-cut adhesion reads grade 0, and phosphate time can drop around 30% because nucleation is already in place. It ships against GB/T 6807 for automotive, appliance and hardware pre-paint work, and Winsir backs it with both titration and precipitation methods for checking bath strength.
Small chemistry, outsized effect
A conditioner is a tiny line cost next to a paint bath, yet it decides whether the phosphate film is fine or coarse, and that decides adhesion and salt spray. Because it is checked by simple titration or precipitation, a plant keeps the bath in band without a lab. A finer film also cuts smutting on the flanges and threads of a pressed part, so fewer pieces come back from the paint line for touch-up.
Product Specifications
|
Parameter |
Specification |
|
Type |
colloidal titanium |
|
Dose |
0.1-0.2% powder or 2-5 mL/L |
|
pH / time |
8-9, 30-60 s |
|
Grain refinement |
about 20 micron down to about 5 micron |
|
Salt spray gain |
about +20% (GB/T 6807) |
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