Технология PCB - как обработать чернение в многослойной пластине PCB

How to deal with the blackening of the inner layer of the PCB multi-layer board

For Производители платы, если PCB multilayer board is a multilayer board, чернение внутри - очень трудный вопрос., so how to blacken it? каков эффект чернения?

The effect of blackening: passivate the copper surface; enhance the surface roughness of the inner layer of copper foil, thereby enhancing the bonding force between the epoxy resin board and the inner layer of copper foil;

tear strength peelstrength

Black oxidation method for general inner layer treatment ofмногослойная панель PCB:

PCB multilayer board black oxidation treatment

PCB multilayer board brown oxidation method

PCB multilayer board low temperature blackening method

PCB multilayer board adopts high temperature blackening method, the inner layer board will produce high temperature stress (thermalstress) which may cause the layer separation after lamination or the crack of the inner layer copper foil;

1. Brown oxidation:

The product of black oxidation treatment of PCB multi-layer circuit boards of Производители платы is mainly copper oxide, не существует так называемых оксидов меди. This is some wrong argument in the industry. After ESCA (electrospecific chemical analysis) analysis, it can be determined

The binding energy between copper atoms and oxygen atoms, соотношение атомов меди и кислорода на поверхности оксида; Чистый анализ данных и наблюдений показывает, что черный продукт является оксидом меди, and there are no other components;

The general composition of blackening liquid:

oxidant sodium chlorite

PH buffer trisodium phosphate

sodium hydroxide

Surfactant

or basic copper carbonate ammonia solution (25% ammonia water)

2. Related data

1. скорость подачи медной фольги Peelstrength 1oz 2 мм/min, ширина медной фольги 1/8 inch, растяжение должно превышать 5 фунтов/inch.

- 2..., the weight of oxide (oxideweight); it can be measured by gravimetric method, generally controlled at 0.2 - 0.5mg/квадратный сантиметр.

3. The significant factors that affect the tear strength through the related variable analysis (ANDVA: the analysis of variable) mainly include:

‘ The concentration of sodium hydroxide

‘¡The concentration of sodium chlorite

‘¢The interaction between trisodium phosphate and immersion time

‘£The interaction between sodium chlorite and trisodium phosphate concentration

"Tear strength depends on the filling of the resin to the oxide crystal structure, Поэтому он также связан с ламинарным параметром и характеристиками pp смолы.

The length of the needle-like crystals of the oxide is 0.05mil (1”1.5um) as the best, а прочность на разрыв также выше;