INT3 Anti-Nitriding Stop-off Paste, Brand Name : Espon for Industrial

Stop-Off Paste for Preventing Nitriding during Gas Nitriding and Plasma Ion Nitriding

Gas Nitriding and Plasma Ion Nitriding are case hardening processes. They enhance wear resistance, seizing resistance, corrosion resistance and fatigue life of nitrided parts. Quite often, selective gas nitriding or selective plasma-ion nitriding becomes essential. ESPON anti-nitriding stop off pastes are extremely useful in preventing nitriding on the coated areas.

 Plastic injection moulding machinery parts like barrel screws are nitrided for increasing their wear resistance. However, threaded areas become brittle if they are nitrided / hardened. ESPON anti-nitriding stop-off paste is used to mask or safeguard such areas from nitriding.

  Hot forging dies are nitrided to increase their service life. However, during die sinking, machining of fully nitrided forging dies is very time consuming due to their high hardness.  Expensive machine-tools wear out fast when used for machining such nitrided dies. Hence, time and money are lost during machining of nitrided dies.

  A productive method to solve this problem is by carrying out selective nitriding, only on the impression of the die, where the hardness is required. Remaining portion of the die is coated  with ESPON anti-nitriding stop-off paste before charging dies into nitriding furnace. Hence, ESPON coated areas of die will be protected from nitriding. Hardness will be achieved only on not coated die impression during nitriding. Nitriding increases forging die life and preventing nitriding using ESPON coating enables easy machinability of forging die during die sinking.

 Hence, use of ESPON anti-nitriding stop-off pastes have proven to enhance productivity and reduce costs by reducing machining time substantially and increasing life of the tools that are used for machining nitrided surfaces.

 nitriding and plasma ion nitriding processes. Some of the popular ESPON anti-nitriding stop- off pastes are ESPON-ANP for selective gas nitriding and ESPON-INT3 for selective plasma nitriding.

  ESPON anti-nitriding stop-off paste is a specialized compound used to prevent nitriding (case hardening) on specific areas of metal parts during heat treatment. It acts as a protective coating, blocking the nitriding process on the areas where it is applied, allowing for selective nitriding. This paste helps to avoid unwanted hardening on certain parts of the component, thereby enabling more precise control over the hardening process.

 How it Works:

• The paste is applied to the areas that are to be prevented from nitriding. 
•  During the nitriding process, the paste forms a barrier, preventing nitrogen atoms from penetrating into the metal surface. 
•  This prevents case hardening in the coated areas, allowing for selective nitriding only where desired.

Benefits of using ESPON anti-nitriding stop-off paste: 

 Precise Control: Enables selective nitriding, ensuring hardness is prevented in coated areas.

 Reduced Machining Time: By preventing unwanted hardening, it reduces time required for machining the nitride parts. 

 Increased Tool Life: Selective nitriding can enhance tool life by preventing unwanted hardening in undesired areas. 

 Cost Savings: By optimizing the nitriding process, it can lead to cost savings in machining and overall manufacturing. 

 Selective Nitriding: Allows for precise control of case hardening, preventing it on coated areas while hardening other areas.

 Easy Application:

• The paste can be applied by brushing, spraying, or dipping.
•  Non-flammable and Non-hazardous.
•  ESPON coating is non-flammabl