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 PRODUCTS

 High P-Ratio Parkerizing Agent DH-3250

Parkerizing Agent DH-180(to be sprayed)

Parkerizing Agent DH-190(to be pickled in)

Parkerizing Agent DH-L4330

Parkerizing Agent DH-J4400 Used in Wire-Drawing

USE DH-3237 IRON-STEEL RUST REMOVER

DH-60L Additive to Iron-Steel Rust Remover

DH-201 Moderate-Temperature High-Effective Degreasing Agent

DH-88 Colloid Titanium Surface Adjuster

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



 
PRODUCTS  

 

 

High P-Ratio Parkerizing Agent DH-3250

1.  General introduction

DH-3250 is a high P-ratio fast parkerizing agent of the Zinc-Nickel-Manganese 3-element system, with a low-temperature and low-dreg character. The agent, through its chemical effects, forms a thin yet even and solid high P-ratio parkerizing film, which is required by most demanding base finishing, such as the painting of automobile parts by cathode electrophoresis. That parkerizing film can remarkably improve the attachment of paint and the resistance against erosion. The surface after finishing will look more refined and showy.

The agent consists of components in 5 packets:

a)  DH-3250A(for preparing the tank)b)  AD-E(for preparing the tank)

c)  DH-3250B(for reinforcement)

d)  activator AC-1

e)  neutralizer NT-Y

2. Technical procedure

degreasing --- cleaning in water --- cleaning in water --- (surface adjustment) --- parkerizing --- cleaning in water --- cleaning in water --- cleaning in pur water

degreasing --- cleaning in water --- pickling in acid --- cleaning in water --- (surface adjustment and neutralizing) --- parkerizing --- cleaning in water --- cleaning in pure water

degreasing and rust removing --- cleaning in water --- cleaning in water --- surface adjustment --- parkerizing --- cleaning in water(hot water)

Choose one of the above procedures and when it has been gone through, put the work piece handled into an oven to be dried.                                                                                   

3.       Preparing the tank(1000L)

a)  Let the tank contain water up to 80% of the total volume.

b)  Put in 55kg of DH-3250A, and stir well.

c)  Put in 6kg of AD-E, and stir well.

d)  Take 10.6kg of NT-525 and dilute it with 40L of water, and then add them into the tank.

e)  Pour in more water to make up the total volume 1000L.

f)   Heat the liquid to the required temperature, and test the acidity.

g)  Add 0.50kg of activator AC-1 and stir well before handling the work piece.

4.       Treatment conditions

General acidity --- 22-25Pt             free acidity --- 0.6-1.2Pt
Activator density --- 2-3Pt              temperature --- 40-45°C
Time duration --- 2-5 minutes

5.       Supplement and adjustment

   As the density keeps changing during the treatment, density tests must be made at regular intervals to maintain it within the required range. Adding every 2.0kg of DH-3250B will increase the general acidity by 1pt. But if overflow has caused loss of the liquid, extra water and DH-3250A should be added. Every 2.3kg of DH-3250A can increase the general acidity by 1pt.

   Free acidity may be lowered by neutralizer --- On condition that only small pieces or no pieces are being treated and the parkerizing liquid is as hot as over 45°C, or that the DH-3250B has been put in too much, then free acidity will go up over 1.2pt. In that case, neutralizer is needed for regulating the liquid. Every 200g of neutralizer can lower the free acidity by 1pt.

   Activator --- Activator in the liquid is consuming even while no work pieces are being treated. So its density should be tested in the process of treatment and extra activator be added to maintain the required density. Every 150g of activator can increase the acidity by 1pt.

6.       Testing methods

   General acidity --- Transfer 10ml of the liquid with a suction pipet into a 250ml beaker and add 5 or 6 drops of phenolphthalein. Titrate with NaOH(0.1N). When the color turns from colorless to pink, it is the end of the titration. The number of ml used is the value of general acidity.

   Free acidity --- Transfer 10ml of the liquid with a suction pipet into a 250ml beaker and add 4 or 5 drops of bromophenol blue indicator. Titrate with NaOH(0.1N). When the color turns from yellow to blue or purple, it is the end of the titration. The number of ml used is the value of general acidity.

   Density of activator --- Fill a fermentation tube with the treating liquid. Add 2-5g of sulphanilamide. Block the tube, turn it upside down and shake it vertically. Then let it stand still for 2 minutes. The volume of the gas produced as indicated by the scales will be the density of the activator. One scale means one pt.

7.       Materials of the apparatuses

   The parkerizing tank should be made of stainless steel or carbon steel. The heat exchanger, the sprayer nozzle, the piping and the pump should be made of stainless steel.

8.       Equipment maintenance

   The best way to rid the tank of deposits is to pump the whole lot of the liquid into a deposit tower or deposit pool, and then return the clean liquid to the parkerizing tank.

 
 
 
 

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Postcode:062451  General:LI BAOQI  E-mial: libaoqi8899@163.com

关键词:脱脂剂  除油剂  酸雾抑制剂  快速除锈剂  表调剂  磷化剂  钝化剂  氧化剂  防锈油