Equipment manufacturing
NPS, Ni-P alloy cladding

Special anti-corrosion metal coatingNPS、Ni-P alloy cladding(HAILIN system )

    Ni—P scope of cladding        

1. Column tube, carbon-steel water cooler, air cooler ,re-boiler tube and other non-style heat exchanger. 
2.Working temperature is within 700℃. 
3.Protection of steel pipes, tubes, shell and impellers of mud pump, column pump and submersible pump.

    Implementation standards  

GB/T13913《rules and testing methods for metal layer by chemical Ni- P alloy paiting》

    Ni—P suitable medium for cladding  

1.Freshwater, salt water, ocean water, industrial cycling water, distilled water and vaor. 
2.Chemical medium with acid-resistance, alkali-resistance , salt-resistance and sewage resistance. 
3.All types of oil medium and benzene, hydrogen sulfide.
    Ni—P technical index of cladding      
1.ISO 2819 testing method and review on bonding strength of coating 
2.Ni—P test and evaluate the coating of alloy coating according to international standard ISO 4527: 
A.ISO 2819 testing method and review on bonding strength of coating 
B.ISO 3768 neutral salt-spray test for coating(NNStest) 
C.ISO 3700 copper accelerated salt-spray test for coating(CASS test) 
D.ISO 4516 vickers hardness and knoop hardness test for coating 
E.ISO 4527 thickness testing standard for coating 
F.ISO 4527 porosity testing standard of coating 
G.ISO 4527 phosphorus testing standard for coating 
3.Ni—P physical performance of alloy coating:Chamfering the Column steel with 50μm, the coating no caving, no cracks, means good cohesion between coating and steel.( see list7, list 8)
Ni—P physical performance of alloy coatin   
 

试验项目

结果

试验方法

硬度 HV50

镀态550 热处理后950

ISO 4527 6.4

内应力kgf/mm

-3.7-4.1

 

附着力 热震,300℃

1级

ISO 4527 6.5

Taber磨损试验指数 磨轮CS-17
失重mg/1000CyCles

镀态、14.524
热处理后3.34

ISO 4527 6.9

Not:Ni—P physical mechanical performance of coating 
Ni—P testing results of coating hardness shows that the hardness of low Ni coating with 1~4Wt%P is around 700HV, the hardness can reach 1000HV after heat treatment, which is close to or even exceed the hard Cr. Coating, and it can substitute the hard Cr. Coating in some conditions. 

   Mechanical performance of Ni—P alloy coating

机械性能

1-4Wt%p

7-9Wt%p

10-12Wt%p

杨氏模数(GPa)

50-52

50-60 60-66(4-7Wt%p)

50-60

拉伸强度(Mpa)

150-200

800-1100

750-900

(钢铁上)内应力(KP/mm)

-+10

-±5

--5

延伸率

<0.5

-0.7

-1.5

镀后硬度(HRC)

650-700

550-600

500-550

400℃热处理1小时(HRC)

-1000

-1030

-1050


    Corrosion rate of Chemical Ni—P(10%) alloy coating in all kinds of medium 

介质分类

介质名称

介质温度℃

腐蚀率mm/Y

Ni-p

Cr18Ni9不锈钢

海水

30

0.0385

>1.5

 

 

50

0.253

>1.5

酸溶液

30%HCl

30

0.407

>1.5

 

 

50

1.001

>1.5

 

10%H2SO4

30

0.0424

>1.5

 

 

60

0.185

>1.5

 

38%H3PO4

60

0.0632

>1.5

 

16%HNO3

30

72.45

<0.05

 

35%草酸

沸腾

0.0363

>1.5G

 

28%醋酸

沸腾

0.0779

>1.5

 

50%柠檬酸

60

0.0350

0.05-0.5G

 

40%氢氟酸

30

0.0141

<1.5G.S

碱溶液

20%NaOH

沸腾

<0.048

>1.5

盐溶液

30%次氯酸钠

50

<0.001

>1.5P.G

 

20%过氯酸钠

沸腾

<0.001

0.05-0.5

 

20%重铬酸钾

沸腾

<0.001

0.5-1.5

 

20%氯化铵

沸腾

0.0874

0.5-1.5

Not:From this comparison, carbon-steel coatingNi—P spends lower cost than stainless steel , meanwhile the function of anti-corrosion and anti-abrasion is superior to 316 stainless steel ,glasses and fluorine plastics. Therefore it’s reasonable from all respects including anti-corrosion and useful life. 

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