审核关于镀银层厚度

2021年1月24日发(作者：lift是什么意思)


关于镀银层厚度，我从贾工处了解了一些信息，集合资料，现总结如下：


About
the
thickness
of
the
silver
coating,
I
get
some
information
from
our
expert
,
following is the collection of the information.


电镀性质决定镀层厚度不可能很均匀，边角处 、折角处（国际上采用直径为
19
的球测
量直径以外区域，
国内用直径
20
的球测量直径以外区域）
、
深孔处等只需做到有镀层即可，
不可能所有 面、所有点都达到
5
μ
m
以上，只能说主要面最小厚度尽量做到等于或者大于
5
μ
m
，具体可参考相关电镀标准（国标或者
ISO
标准） 。

Plating
’
s
nature
determines
that
the
coating
thickness
woule
not
be
very
uniform.
It is acceptable that there are coating at corners(international people measure
other
area
with
a
ball
of
diameter
19 while
domestic
people
measure
it
with
a
ball
of diameter 20) and deep holes. Coating thichness at all faces, points will not be
all thicker than 5
μ
m. We can only say that we will try our best to achieve that
the minimum coating thickness at major surfaces is equal to or greater than 5
μ

m. And you can refer to related electroplating standard (domestic standard or ISO
standard) for details.


1
、镀层均匀性：


thickness uniformity

所有电镀层的厚度都不会是均匀的，
这是电镀的性质决定的。
因为在同一个 制件上，
电流密
度不可能做到均匀。

The
coating
thickness
of
all
plating
will
not
be
uniform,
this
is
determined
by
the
nature of the electroplating. Because in the same product, current density might
not be uniform.

不管什么电镀都是厚度不均匀
,
只是相差的大与小的问题
,
如挂镀时
,
每挂最上面和下面的工
件肯定会比中间的厚一些
,
滚镀的有时一些工件滚到 一些死角的地方，厚度比那些滚的流畅
的工件厚度要薄一些，
那单个工件来说，
边角部 分的厚度比中间部位的厚度要厚，
这是肯定
的，
虽然有些厂里做了工件高区的遮挡，< br>以免电流增大，
高区烧焦，
也是为了低区的厚度提
升，
高区厚度降低，
来提升整体的厚度均匀，
但是还是不可能那么均匀。
这所有这些现象都
是一个 原因，
就是电镀产品电镀时的情况就像磁铁一样有一个磁力线原理，
边角或尖端的电
流 线是密集的，中间肯定会比边缘的少的缘故。

No
matter
what
kind
of
plating
it
is,
the
thickness
will
not
be
uniform.
It
is
just
the
problem
whether
the
difference
is
big
or
small.
such
as
the
huning
plating,

the
top
and
bottom
of
every
workpiece
will
be
thick
than
middle,

and
in
rolling
plating,
sometimes
the
thickness
of
some
blind
angle
is
thinner
than
fluent
rolling
workpiece.
It
is
sure
that
for
the
individual
workpiece,
the
thickness
of
edge
is
thicker
than
the middle place.

Although some of the factories keep the high place of workpiece
be covered

to avoid being burned because of the bigger electric current and to
improve the uniform of the plating by increasing the thickness of high place and
decrease
the
thickness
of
low
area,
the
whole
thickness
is
still
not
so
uiform.
These
phenomena is come from the same reason, that is, just like a magnet, the plating
products also have a pricple of magbnetic field lines, the electric current line
of corner and sharp corner is intensive, and the coating thickness in the middle
must be less than the edge area.

2
、电镀工艺缺陷：

Electroplating process defect

工艺允许的缺陷是 指由于电镀工艺的限制，
在电镀加工过程中出现的不可克服的缺陷，
在一
定的范围内，
不作为不合格的判定依据。
工艺允许的缺陷往往是由于镀件结构复杂和电镀工
艺技术的 限制而难以完全消除的缺陷，
比如深孔内可以允许一定孔深内没有镀层，
或规定孔
口向 内的一定距离内有镀层即为合格等。
但是工艺允许的缺陷以不损失产品的使用功能为前
提，是在 不影响产品性能前提下的让步接收。

Allowing process defect

means that because of the limitation of plating processes

some overcome defects appeare in the process, in a certain range, it would not be
the judgement basis as an unqualified product. Allowing process defect is always
the
result
from
a
complex
structure
of
the
plating
and
the
limitation
of
electroplating process technical which is completely eliminate.

For example, in a
deep hole, it is allowed that there would be no coating in the certen deepness
,
or
it
would
regulate
that
when
there
is
coating
from
the
orifice
to
the
certen
distance,
it is a qulified product, etc.

But the primise of the allowing process defect is
that it cannot loss the using function of the product, it would be acceptable when
there is no influence to the product.

3
、镀层测量
GB12334
等效
ISO 2064

coating measurement GB12334 is equal to ISO 2064

(1)
适用范围

本国际标准定义了有关任何基体上的金属和其他非有机覆盖层厚度测量的术语。此外，还规定了一些测量覆盖层最小厚度所要遵循的通则。

Applicable
scope,
this
international
standard
defines
the
terms
about
any
substrate
of metal and other than organic layer thickness measurement.

In addition,it also
gives out general rules to measure the minimum thickness of the cover.


(2)
本国际标准采用以下定义

①主要表面：工件上已涂覆或待涂覆的部分，对这部分而< br>言，覆盖层对使用性能和
/
或外观都是至关重要的；并且这部分的覆盖层必须符合所有规 定
要求。②测量面：主要表面上作单个测量的区域。以下方法的“测量面”的相应定义为：

This
international
standard
adopts
the
following
definitions
(1)
:
the
major
surface:
as for the part of workpiece which has been coated or will be coated, it is very
important
to
the
use
performance
and/or
appearance.
And
the
cover
on
this
part
must
comply
with
all
requirements.
(2)
the
measuring
surface:

the
main
surface
is
a
single
measuring
area.
Following
are
the
correspondent
definitions
of
“
measuring
surface
”
by different ways.

(a)
分析法的测量面为退除覆盖层的区域；

Analysis: the measuring surface is the area where the cover is stripped.

(b)
阳极溶解法的测量面为电解池封闭圈所包围的区域；

An
anodic
dissolution:
the
measuring
surface
is
the
area
surrounded
by
electrolysis
pool closed circle.


(c)
显微镜法的测量面为在规定放大倍数下的视野区域；

Microscopy: the measuring urface is the view area that be enlarged under provide
multiple.

(d)
无损法的测量面为探头区域或影响读数的区域。

Non- distructive
method:
the
measuring
surface
is
the
probe
area
or
the
area
influences the reading.

③参比面：要求作规定次数的单个测量的表面。

Reference surface: the surface requires specified number of single measurement.

④局部厚度：在参比面内规定次数厚度测量的平均值。

Local thickness:

the average value by the specified number of measurement of the
thickness to the referance surface.

⑤最小局部厚度：在单个工件的主要表面所测得的局部厚度的最小值。