Zn-Mn phosphate coating

Little-sediment. Using at low-temperature. Filming fast. Phosphate coating is thin and firm, dense and uniform.

1. Overview

  IC-2010 Zn-Mn series phosphate coating agent is low-temperature Zinc-series phosphating agent for surface phosphating of iron and steel parts, polished steel plate. There are some advantages, such as low-temperature, fast filming, little sediment, light pollution. Phosphate coating is thin and firm, dense and uniform, and nuclei is small. The product is suitable for large-scale immersion line or the combination of spraying and dipping with strong processing capability. It is the representative product of high-quality products bonderite developed by our company.

2. Using method

Working liquid preparation (1 ton)

a. Reagent of working liquid

  IC-2010A Zn-Mn series phosphate coating agent

  IC-2010B Zn-Mn series phosphate coating agent

  NT-125 neutralizer

  AC-130 accelerator

b. First, adding water to sink with 50 % of the capacity of sink. Second, IC-2010A of 50 kg was added to the sink. Third, NT-125 neutralizer of 7.5 to 8.0 kg was dissolved in a small amount of water, and then adding slowly to sink and stirring until flocculent precipitate was completely dissolved. Finally, adding margin water, and stir evenly. Confirming process indicators.

  Before using heated to processing temperature, adding AC-130 accelerator of 1.3 kg, stirring evenly.

3. Parameters of working liquid management

                              Dipping               Spraying

Total acidity:            18 to 30               18 to 30

Free acidity:             0.7 to 1.8              0.7 to 1.3

Accelerator:             2.0 to 4.0              1.5 to 4.0

Temperature:            38 to 42 degrees    35 to 45 degrees

Time:                        3 to 5 min             2 to 3 min

Spraying pressure: 0.6 to 1.0 kg/cm2

4. Detection and analysis

4.1 Total acidity (points)

  Taking 10 ml working fluid to the conical flask, and adding phenolphthalein indicator of 3 to 5 drops. Titrating above-mentioned solution by 0.1 M sodium hydroxide standard solution from colorless to red. The quantity (ml) of 0.1 M sodium hydroxide standard solution is called the points of total acidity.

4.2 Free acidity (points)

  Taking 10 ml working fluid to the conical flask, and adding bromophenol blue indicator of 2 to 4 drops. Titrating above-mentioned solution by 0.1 M sodium hydroxide standard solution from yellow to blue. The quantity (ml) of 0.1 M sodium hydroxide standard solution is called the points of free acidity.

4.3 Accelerator detection

  Taking a certain amount of working liquid to the fermentation tube, and putting 2 to 3 grams amino acid. A few minutes later, observing the amount of gases.

5. Supplement and adjustment of solution (1 ton)

a. After using a period of time, phosphating working liquid will lose activity. When the points of total acidity below 18 points, IC-2010B should be added. IC-2010B of 1.8 kg can increase one point of total acidity. If the water level of tank dropped, water should be added to 1 ton. At this time total acidity below 18 points, IC-2010A should be added, and IC-2010A of 1.7 kg can improve one point of total acidity.

b. When working liquid temperature was too low, or IC-2010B was added not enough, the points of free acidity may reduce to less than 0.7. IC-2010B 1.0 kg can increase free acidity of 0.1 points.

c. Even if the working liquid wasnt used, accelerator was aslo gradually broke down. So before using the points of accelerator must be re-measured and added. Accelerator of 0.5 kg can increase accelerator of 1 point.

Zn-Mn phosphate coating