IPC-A-600H-2010 中文版 印制板的可接受性 (1).pdf - 第36页

Nonwetting: The inability of molten solder to form a metallic bond with the basis metal. 不润湿: 熔 融 的 焊 料不能与 金 属 基材 形 成 金 属键 合。 T arget Condition - Class 1,2,3 (⽬标条件 - 1,2,3级) • No nonwetting. • 无 不 润 湿 。 Acceptable - Clas…

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Nonconforming - Class 1,2,3(不符合条件 - 1,2,3级)
Defects either do not meet or exceed above criteria.
缺陷不符合或出上述要求。
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2.3 BASE MATERIAL SUBSURFACE(基材表⾯下)
2.3.4 Foreign Inclusions (cont.)(外来夹杂物(续)
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Nonwetting: The inability of molten solder to form a metallic bond with the basis metal.
不润湿:料不能与基材属键合。
Target Condition - Class 1,2,3(⽬标条件 - 1,2,3级)
No nonwetting.
湿
Acceptable - Class 1,2,3(可接受条件 - 1,2,3级)
Complete wetting on all conductive surfaces where solder is not
excluded by mask or other plating finish. Vertical sides (conduc-
tor and land) areas may not be covered.
未被或其他镀层覆盖的所有导电表面被焊
湿面(体和)区域可以不覆盖。
Nonconforming - Class 1,2,3(不符合条件 - 1,2,3级)
Defects either do not meet or exceed above criteria.
缺陷不符合或出上述要求。
241b
241c
241a
注:此图仅⽤作说明状况,并不要求做显微剖切评价。
不润湿
焊料
金属基材
基材
2.4 SOLDER COATINGS AND FUSED TIN LEAD(焊料涂覆层和热熔锡铅层)
2.4.1 Nonwetting(不润湿)
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Dewetting: A condition that results when molten solder coats a surface and then recedes to leave irregularly-shaped mounds of solder that
are separated by areas that are covered with a thin film of solder and with the basis metal not exposed.
退润湿:覆在表面上回缩导致覆盖且未基材或表面的区域分的不
规则的一种状况。
Target Condition - Class 1,2,3(⽬标条件 - 1,2,3级)
No dewetting.
无退湿
Acceptable - Class 2,3(可接受条件 - 2,3级)
On conductors and ground or voltage planes.
On 5% or less of each land area for solder connection.
体上和接地上有退湿
个焊退湿的面于或等于5%
Acceptable - Class 1(可接受条件 - 1级)
On conductors and ground or voltage planes.
On 15% or less of each land area for solder connection.
体上和接地上有退湿
个焊退湿的面于或等于15%
242b
242c
242a
注:此图仅⽤作说明状况,并不要求做显微剖切评价。
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2.4 SOLDER COATINGS AND FUSED TIN LEAD(焊料涂覆层和热熔锡铅层)
2.4.2 Dewetting(退润湿)
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