Stainless steel passivation solution environmental protection passivator manufacture

&Nbsp; Stainless steel components are clean and the passive film is complete before installation, but the passive film of weld and heat affected zone (HAZ) will be damaged during welding
In the passive film, the content of chromium is usually higher than that of iron
When the metal melts, the concentration of iron increases and the content of chromium decreases, which disturbs the distribution of chromium, iron and oxygen in the weld and heat affected zone
If the oxidation and pollution (especially iron element) caused by heat during the manufacturing process are not removed, this may reduce the corrosion resistance
Post weld passivation can remove free iron ions, which is helpful to restore the passivation layer, but can not remove the oxidation color caused by heat
Removal of the thermal oxidation color requires a stronger acid than the nitric acid or citric acid used for passivation
Because passivation is usually only used for the installed piping system after welding, the welding procedure specifies the method to reduce the formation of thermal oxidation

Precautions for stainless steel passivation solution:
Passivation containers can generally adopt plastic boxes, plastic tanks and stainless steel tanks
Soak the passivation stock solution at room temperature for 8 to 15 minutes
It is suitable for primary color passivation of stainless steel workpieces such as SUS304 and SUS316

The passivation solution does not contain harmful substances, complies with RoHS and reach environmental specifications, and has passed SGS and FDA certification

Through the national unified blue dot method, there is no blue dot in 35 seconds

Operators shall wear labor protection equipment during operation to avoid direct contact between passivation solution and skin

Waste water treatment, neutralization with alkaline lime water or sodium hydroxide, etc
, and discharge when the pH value reaches 7, which has no impact on the environment

Storage and packaging:
The temperature of this product should not exceed 75 ℃ during storage, loading and unloading
If it is stored for a long time, the temperature should not exceed 45 ℃
This product is not easy to burn, non explosive, corrosive and environmentally friendly

Manufacturing, cutting and bending will produce pollutants, which will reduce the corrosion resistance, such as embedded iron filings, heat seals, welding flux on welding rods, arc damage, paint, marks, etc
, which are particularly harmful when exposed to carbon steel or iron
By removing contaminants, especially free iron, the passivation treatment helps to restore the stainless steel damaged during fabrication to its original passive state