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   
                                                   

                                                  試驗項目

                                                  結果

                                                  試驗方法

                                                  硬度 HV50

                                                  鍍態550 熱處理后950

                                                  ISO 4527 6.4

                                                  內應力kgf/mm

                                                  -3.7-4.1

                                                   

                                                  附著力 熱震,300℃

                                                  1級

                                                  ISO 4527 6.5

                                                  Taber磨損試驗指數 磨輪CS-17
                                                  失重mg/1000CyCles

                                                  鍍態、14.524
                                                  熱處理后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

                                                  機械性能

                                                  1-4Wt%p

                                                  7-9Wt%p

                                                  10-12Wt%p

                                                  楊氏模數(GPa)

                                                  50-52

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

                                                  50-60

                                                  拉伸強度(Mpa)

                                                  150-200

                                                  800-1100

                                                  750-900

                                                  (鋼鐵上)內應力(KP/mm)

                                                  -+10

                                                  -±5

                                                  --5

                                                  延伸率

                                                  <0.5

                                                  -0.7

                                                  -1.5

                                                  鍍后硬度(HRC)

                                                  650-700

                                                  550-600

                                                  500-550

                                                  400℃熱處理1小時(HRC)

                                                  -1000

                                                  -1030

                                                  -1050


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

                                                  介質分類

                                                  介質名稱

                                                  介質溫度℃

                                                  腐蝕率mm/Y

                                                  Ni-p

                                                  Cr18Ni9不銹鋼

                                                  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

                                                  沸騰

                                                  0.0363

                                                  >1.5G

                                                   

                                                  28%醋酸

                                                  沸騰

                                                  0.0779

                                                  >1.5

                                                   

                                                  50%檸檬酸

                                                  60

                                                  0.0350

                                                  0.05-0.5G

                                                   

                                                  40%氫氟酸

                                                  30

                                                  0.0141

                                                  <1.5G.S

                                                  堿溶液

                                                  20%NaOH

                                                  沸騰

                                                  <0.048

                                                  >1.5

                                                  鹽溶液

                                                  30%次氯酸鈉

                                                  50

                                                  <0.001

                                                  >1.5P.G

                                                   

                                                  20%過氯酸鈉

                                                  沸騰

                                                  <0.001

                                                  0.05-0.5

                                                   

                                                  20%重鉻酸鉀

                                                  沸騰

                                                  <0.001

                                                  0.5-1.5

                                                   

                                                  20%氯化銨

                                                  沸騰

                                                  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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