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Technology Overview ; |
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Electroless Nickel ( EN) deposits are typically classified as functional coatings and historically have found use in applications that require protection from either CORROSION or WEAR and in some cases both. Because of the unique deposit properties and uniformity of the resultant film. |
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Physical and mechanical properties. |
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Microstructure and composition of ENP films ---- Fig 1 , 2 |
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One of the distinct advantages of the electroless nickel deposition process is the ability to produce an alloy of nickel and phosphorus in varying composition Depending on the formulation and the operation of the chemistry the film compositions can vary from 2 to 13 weight percent phosphorus. |
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DEPOSIT UNIFORMITY: |
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A significant advantage of the electroless nickel process is the ability to produce deposits with uniform thickness on parts with complex geometrics and shapes. |
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MELTING POINT: |
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Pure Ni has melting point of 1455*C (2650*F). However EN is an alloy and as the Phosphorus content is increased within the film, the deposit begins to soften at lower temperatures and continues to soften until it eventually melts. The highest melting point is for low phosphorus deposit ( Less than 3% ) melting points at 1200*C ( 2200*F). |
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ELECTRICALL RESISTIVITY: |
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Heat treatment of the ENP film can affect resistivity. |
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MEGNETIC PROPERTIES: |
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The non magnetic property of these high phosphorus films is one of the most important physical characteristics. |
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CORROSION RESISTANCE : |
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The use of neutral salt spray in accordance with the ASTM B117 specification. |
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DEPOSIT HARDNESS: |
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As platted ENP deposit range from 500 to 720VHN heat treatment of ENP deposit will significantly increase the micro hardness approx 65 to 70 HRC. |
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Wear Resistance , Lubricity, Ductility and Internal stress some of the good qualities of EN process. |
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