An electrolytic etching method for revealing the microstructure of electrodeposited nickel

1937 ◽  
Vol 33 ◽  
pp. 511
Author(s):  
A. J. Krombholz
Keyword(s):  
Etching Method ◽  
Electrolytic Etching ◽  
Electrodeposited Nickel

Study on fine lines and undercut suppression of printed circuit board prepared by electrolytic etching

Circuit World ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Denglin Fu ◽  
Yanan Wen ◽  
Jida Chen ◽  
Lansi Lu ◽  
Ting Yan ◽  
...  
Keyword(s):  
Corrosion Inhibitor ◽  
Corrosion Inhibitors ◽  
Printed Circuit Board ◽  
Copper Surface ◽  
Etching Process ◽  
Circuit Board ◽  
Content Type ◽  
Printed Circuit ◽  
Etching Method ◽  
Electrolytic Etching

Purpose The purpose of this paper is to study an electrolytic etching method to prepare fine lines on printed circuit board (PCB). And the influence of organics on the side corrosion protection of PCB fine lines during electrolytic etching is studied in detail. Design/methodology/approach In this paper, the etching factor of PCB fine lines produced by new method and the traditional method was analyzed by the metallographic microscope. In addition, field emission scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to study the inhibition of undercut of the four organometallic corrosion inhibitors with 2,5-dimercapto-1,3,4-thiadiazole, benzotriazole, l-phenylalanine and l-tryptophan in the electrolytic etching process. Findings The SEM results show that corrosion inhibitors can greatly inhibit undercut of PCB fine lines during electrolytic etching process. XPS results indicate that N and S atoms on corrosion inhibitors can form covalent bonds with copper during electrolytic etching process, which can be adsorbed on sidewall of PCB fine lines to form a dense protective film, thereby inhibiting undercut of PCB fine lines. Quantum chemical calculations show that four corrosion inhibitor molecules tend to be parallel to copper surface and adsorb on copper surface in an optimal form. COMSOL Multiphysics simulation revealed that there is a significant difference in the amount of corrosion inhibitor adsorbed on sidewall of the fine line and the etching area. Originality/value As a clean production technology, electrolytic etching method has a good development indicator for the production of high-quality fine lines in PCB industry in the future. And it is of great significance in saving resources and reducing environmental pollution.

The Fabrication of the Convex Platform Surface with Phyllotactic Pattern by Electrolytic Etching Method

2014 ◽  
Vol 685 ◽  
pp. 85-89
Author(s):  
Fei Ma ◽  
Yu Shan Lu ◽  
Jun Wang
Keyword(s):  
Current Density ◽  
Room Temperature ◽  
Convex Surface ◽  
Etching Rate ◽  
Grinding Wheel ◽  
Work Piece ◽  
Phyllotactic Pattern ◽  
Etching Method ◽  
Electrolytic Etching

In order to get the convex surface with phyllotactic pattern, the convex surface with phyllotactic pattern on end face of work-piece and its mask were designed based on the phyllotactic theory of biology, the surface was fabricated by electrolytic etching method, and also the fabricating processes were investigated .The results show that the convex surface with phyllotactic pattern can be fabricated by electrolytic etching method , and under the condition of room temperature (25°C), composite etching liquid which composed of NaCl,NaNO3,Na3PO4,etc., has better performance than the pure NaCl etching fluid, and in the current density of 15A/dm2, the etching rate was 3.292μm/min by composite etching liquid when steel 45 is etched. This technology can be used for fabricating the end grinding wheel with the phyllotactic pattern of abrasive clusters.

Ultrastructural study of cytoskeletal interactions with endosomes in macrophages by quickfreezing and deep-etching method

1990 ◽  
Vol 48 (3) ◽  
pp. 576-577
Author(s):  
Takeshi Baba ◽  
Nobuki Shiozawa ◽  
Masao Hotch ◽  
Shinichi Ohno
Keyword(s):  
Immune Complex ◽  
Ultrastructural Study ◽  
Fc Receptor ◽  
Coated Pits ◽  
Deep Etching ◽  
Receptor Mediated Endocytosis ◽  
Etching Method ◽  
Quick Freezing

Endosomes are vesicular or tubular organelles that play important roles in transports of receptors and receptor―bound ligands during receptor-mediated endocytosis. The mechanisms of endocytic transports from clathrin-coated pits to lysosomes have been studied by many investigators. However, few studies were reported about the interactions between endosomes and cytoskeletons. In this study, Fc-receptor-mediated endocytosis in macrophages are investigated by quick-freezing and deep-etching (QF-DE) method combined with gold-labeled immune complex and “replica scraping method”.

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