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Advantages of our diffusion treatment

High-temperature oxidation resistance

Aluminum diffusion treatment of our Calorizing, ALPLEX, etc., improves the high-temperature oxidation resistance of almost all materials, such as common steel, special steel, stainless steel, copper, etc.

Our Calorizing and ALPLEX have high-temperature oxidation resistance to machinery and machine parts, can extend the product life, improve the reliability of machine parts, and reduce maintenance costs.

[Test condition]  
Material STPG370
Conditions 900℃×1000hr

Comparison of amount of oxidation

Abrasion (erosion) resistance and Exfoliation resistance

Our diffusion treatment, such as Chromizing or Vanadizing, significantly increase the surface hardness by 15 to 20 times compared with non-treated products of common steel.

Although it is possible to obtain a surface hardness close to our diffusion treatment even with general surface treatment, our diffusion treatment has the gradient function characteristic of concentration in the surface of diffused metal, so the treated layer is difficult to be exfoliated.

Therefore, it provides high abrasion resistance and exfoliation resistance, even in severe circumstances of rapid heating and cooling such as thermal shock.

Comparison of
various surface treatment hardness



Our chromizing (Chrocoat) and vanadizing treatments are more effective at preventing thermal shock than nitriding and PVD, and their coating layer adhere more strongly to the base metal.

[Test condition]  
Material SKD61
Conditions One charge defined as heating at 500°C × 2 min.
followed by water cooling (spray) for 10 sec.

Durability comparison of various surface treatment

 

Erosion resistance

Our Calorizing treatment has the excellent erosion resistance to molten zinc, solder, etc. It is used for equipment and components of continuous galvanizing line for automobile bodies and electrical appliance housings.

In addition, Chromizing and Vanadizing treatment has the superior erosion resistance to molten aluminum compared to nitrided products.

Carburization resistance

Our Calorizing treatment can extend the product life by prevention from carburizing or nitriding to furnace components and jigs during carburizing or nitriding of automotive parts, machine tool parts.

Normally, these materials are expensive due to high content of nickel and chromium, but our diffusion treatment prevents from cracking and deformation of products by carburization, which leads to extend the product life and reduce running costs. 

[Test condition]  
Material SCH13、Calorized SCH13
Time heating at 930°C × 12 Hr.
10 charge
Conditions solid carburizing

Comparison between calorizing and non treatment at carburization resistance

General evaluation

Adhesion
to base
metal
Alloying
with
base metal
Coating
layer
thickness
Coating
density
Coating
uniformity
Coating
surface
roughnes
Product
shape
Diffusion treatment
hot dipping ×
plating × × × ×
thermal spraying × × × ×
P.V.D × × ×
C.V.D × ×
Classification
Excellent
Good
Normal
Poor×
Yes(exist)
No×
Thick
Medium
Thin×
Dense
Sparse×
Uniform
Non-niform×
Smooth
Normal
Rough×
Extensive
Normal
Limited×
Object
size
Variety of
coating
materials
Diversity
Diversity of
materials
to be
treated
Distortion
after
treatment
Deterioration
of
mechanical
properties
of object
Economy
cost
Diffusion treatment
hot dipping × × ×
plating
thermal spraying ×
P.V.D × ×
C.V.D × ×
Classification
Extensive
Normal
Limited×
High
Medium
Low×
High
Medium
Low×
Large
Medium
Low×
Low
Medium
Large×
Low cost
Normal
Costly×
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