Neodymium magnets are infamously known as the strongest magnets
that are commercially available throughout the globe. The widespread
applications of neo magnets in all aspects of life both domestically as well as
industrially means the exposure of these super magnets to various types of
atmospheres and environments. NeFeB mainly constitutes the elements of
neodymium, iron and boron. Therefore, this product is very vulnerable when
exposed to the open atmosphere and will most definitely corrode and rust over
time if not protected with a suitable permanent layer of coating on top. In the
absence of a surface finish, neodymium magnets would easily chip, break and
lose its magnetic ability very quickly.
There is a wide range of magnet layers
available within the market. Among all the types of surface neodymium coatings the most widespread and commonly used is a
nickel application. The basic benefit of nickel is that it hardens the magnet
surface and does not allow chipping or breakage easily. Many a time’s two
elements are combined to strengthen the shield around the magnet. A standard
nickel – copper – nickel coat is such an example. This coat along with being
extremely corrosion resistant is also very shiny and aesthetic to look at. Other
types of coating include epoxy resin, zinc, gold and rubber coats etc are used
in the plating of permanent
magnets. While
Ni-Cu-Ni coat is the strongest however not being waterproof, the plastic epoxy
layer is more suitable for wet environments. Another property of neo magnet
coating is that it is generally very thin and is always applied after
completely drying the permanent magnet in order to avoid any form of rusting
from the inside out. The choice of buying any particular coat also depends upon
the user’s prerequisite. For instance, a gold coat is ideal for medical
equipments in a situation where an inert non-reactive metal is integral for
health regulations. On the other hand, a rubber coat would increase friction
and be considered more friendly for installation in huge machines within the
industrial sector.
Therefore despite advancements and improvements
with added research, it is still strongly recommended to always protect a neo
magnet from moisture through an outer coat. It should be known that,
irrespective of any type of coating, over time all NeFeB’s are bound to corrode
and no magnet can survive forever. However, the quality of any specific coat is
of fundamental importance and is the basic determinant of a neodymium magnet’s
life.
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