Keelekümbluse kullaprotsessi põhimõte

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Kuumad uudised

Keelekümbluse kullaprotsessi põhimõte

2024/09/20

0243368} Me kõik teame, et PCB hea juhtivuse saavutamiseks on trükkplaadil olev vask peamiselt elektrolüütiline vaskfoolium ja vase jooteühendused õhuga kokkupuute ajal on liiga pikad, et neid oleks lihtne oksüdeerida, mis põhjustab halba juhtivust või halba kontakti, vähendades PCB jõudlust, seega peame tegema vase jooteühenduste pinnatöötlust. Sukelduskuld katab sellele kulda, kuld võib oksüdeerumise vältimiseks tõhusalt moodustada vaskmetalli ja õhu vahele plokkkihi, nii et sukelkuld on oksüdatsioonivastane pinnatöötlus, mis toimub keemilise reaktsiooni kaudu kaetud vaskfooliumi pinnal. õhukese kullakihiga, mida nimetatakse immersioonkullaks.

Eelmine: Millist tüüpi klaasi kasutatakse autopeeglites?

Edasi: Kõrge kuvasuhtega HDI PCBde galvaniseerimise uurimine (1. osa)

基本文件流程错误 SQL 调试

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CONNECT:[ UseTime:0.000402s ] mysql:host=127.0.0.1;port=3306;dbname=tradeadmin;charset=utf8mb4
SHOW FULL COLUMNS FROM `web_b2b_navigation` [ RunTime:0.000799s ]
CONNECT:[ UseTime:0.000251s ] mysql:host=127.0.0.1;port=3306;dbname=tradeadmin;charset=utf8mb4
SELECT * FROM `web_b2b_navigation` WHERE `status` = 1 AND `lang_id` = 46 ORDER BY `sortid` ASC,`id` ASC [ RunTime:0.000219s ]
SHOW FULL COLUMNS FROM `web_b2b_column` [ RunTime:0.000631s ]
SELECT `a`.`id`,`a`.`column_name`,`a`.`parentid`,`a`.`page_url`,b.column_name as title FROM `web_b2b_column` `a` LEFT JOIN `web_b2b_column` `b` ON `a`.`id`=b.base_id AND b.lang_id=46 WHERE `a`.`status` = '1' AND `a`.`lang_id` = '46' ORDER BY `a`.`sortid` ASC,`a`.`id` ASC [ RunTime:0.000255s ]
SHOW FULL COLUMNS FROM `web_customer_news_lang_46` [ RunTime:0.000736s ]
SELECT `a`.*,b.title cat_name FROM `web_customer_news_lang_46` `a` LEFT JOIN `web_customer_news_category` `b` ON `a`.`cat_id`=`b`.`id` WHERE `a`.`status` = '1' AND `a`.`on_b2b` = '1' AND `a`.`id` = '2035' LIMIT 1 [ RunTime:0.000691s ]
SHOW FULL COLUMNS FROM `web_system_customer` [ RunTime:0.000931s ]
SELECT * FROM `web_system_customer` WHERE `is_online` = 1 AND `id` = 143 LIMIT 1 [ RunTime:0.000367s ]
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SELECT `a`.`id`,`a`.`title`,`a`.`cat_id`,`a`.`link_url` FROM `web_customer_news_lang_46` `a` LEFT JOIN `web_system_customer` `b` ON `a`.`customer_id`=`b`.`id` WHERE `a`.`status` = '1' AND `a`.`on_b2b` = '1' AND `b`.`is_online` = '1' AND `a`.`id` < '2035' ORDER BY `a`.`id` DESC LIMIT 1 [ RunTime:0.000759s ]
SELECT `a`.`id`,`a`.`title`,`a`.`abstract`,`a`.`pic`,`a`.`create_time`,`a`.`link_url`,b.title cat_name,`c`.`username`,`d`.`company_name` FROM `web_customer_news_lang_46` `a` LEFT JOIN `web_customer_news_category` `b` ON `a`.`cat_id`=`b`.`id` LEFT JOIN `web_system_customer` `c` ON `a`.`customer_id`=`c`.`id` LEFT JOIN `web_customer_website_setting` `d` ON `a`.`customer_id`=d.customer_id AND d.lang_id=46 WHERE `a`.`status` = '1' AND `a`.`on_b2b` = '1' AND `c`.`is_online` = '1' ORDER BY `a`.`hits` DESC,`a`.`create_time` DESC,`a`.`id` DESC LIMIT 6 [ RunTime:0.000421s ]

0.104574s

Kõrge kuvasuhtega HDI PCBde galvaniseerimise uurimine (2. osa)

Kõrge kuvasuhtega HDI PCBde galvaniseerimise uurimine (1. osa)

Mobiiltelefoni PCB struktuur

Mis on PCB SMT šabloon (osa 15)

Mis on PCB SMT šabloon (14. osa)

Mis on PCB SMT šabloon (osa 13)

Keelekümbluse kullaprotsessi põhimõte