Determination of the Optimum Regime of Zinc Electroplating on steel Cartridge Cases

الموضوعات

علوم بحتة وطبيعية

العلوم الاجتماعية › العلوم الاقتصادية › الانتاج › الصناعة · العلوم البحتة(الطبيعية) › الكيمياء والعلوم المتصلة بها › الكيمياء التحليلية › التحليل الكهربائى · العلوم البحتة(الطبيعية) › الكيمياء والعلوم المتصلة بها › علم المعادن › الزنك

الملخص

Determination of the optimum regine for zine electroplating on steel cartridge cases . the aim of this work is to obtain the optimum regime for production of good quality zinc deposit by electrolysis on steel cartridge cases , because the plant ( 99 ) produced zinc deposits have on the surface some amount of ( pitting ) and do not meet the requirements according to standard . this zinc coating consists of the electroaeposited zinc layer from on acid zinc bath and as zinc provides only limited corrosion protection it is subjected to post plating phosphate conversion coating for increased corrosion resistance . At the acid zinc electrolyte bath has no detergent effect , cleaning and rinsing of samples must be meticulously through . A cleaning cycle begins with alkaline cleaning , rinsing , acid pickling with the introduction of inhibitor , rinsing , sludge free pickling , rinsing then acid etching , followed by rinsing . The bath constituents used in this work are the following zinc sulphate 230 - 270 g / l . Sodium sulphate 110 - 140 g / l . Aluminium sulphate 35 - 45 g / l . Addition agents 1 - 3 g / l . stirring is provided by air and temperature is from 18 to 30 oC . Anodesoluble anodes are made from zinc pure with 0.5 5 of aluminium cathodes are made from steel cartridge cases . inter polar distance is nearly 10 cm . A rapid method for selecting the working current density range was performed by using Hull cell . From the Hull cell we found the range of current density , which gives good deposit from 2.5 to 4 A / dm2 . The range of current density was then tested by : using cathodes from steel cartridge under the production conditions . For the determination of the optmum pH value , we made experiments with changing the pH value in the range 2.8 - 4.3 . we found the optimum pH from 3.8 to 4.0 . For determining the effect of additional agent , we carried out some tests . the data of these experiments showed that the addition of dextrine gives a smooth and fine grain deposit at the current density range 2.5 - 6 A / dm -2 i. e the presence of dextrine widens the range of current density through which we obtain good deposits on making experiments on the cathodes under the production conditions we found the optimum concentration of dextrine at pH 3.8 - 4 and current density 4 - 6 A / dm2 is 1 - 3 g / l . The cathodic current efficiency was found to be about 95 % so according to the laboratory experimental results the following regime is recommended : 1- In the cleaning surface process during the alkaline cleaning stage usually sodium hydroxide is introduced and during acid pickling stage it is necessary to introduce inhibitor with acid H2 SO4 100 g / l inhibiter 30 - 60 g / l , duration of pickling 10 - 30 sec . 2- Increase the value of pH of the electrolyte solution from 3.2 till 3.8 - 4 . 3- Increase the current density from 2.5 - 4 A / dm 2 ., which will lead to the intensification of the process . 4- Concentration of dextrine into solution must be 1 - 3 g / l . Besides this , we recommend the strict control of the above mentioned parameters ( current density , pH , extrine ) , and also the composition of the colution during degreasing , pickling etching and …. Phos phating solution .

روابط وملفات

التعريف والنوع

رقم الوثيقة

10183

رقم المصدر

122256

رمز المصدر

BK00010183-001

رقم العقد

340

نوع الوسائط

AskZad

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

ورقي

أسماء الملفات

11222560001.pdf

بيانات النشر

ترجمة العنوان

تحديد الشروط اللازمة للطلاء الكهربي بالزنك على الظرف الصلب

ألقاب المؤلفين

[{"name_ar":"Sosnovsky Y. N","name_en":"Sosnovsky, Y. N","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Teodora Ibrahim","name_en":"Teodora Ibrahim","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"إبراهيم جرجس إبراهيم","name_en":"Ibrahim Gerges Ibrahim","title_ar":"مؤلف","title_en":"Author"}]

اللغة

Arabic

المصدر والدورية

اسم المصدر

Determination of the Optimum Regime of Zinc Electroplating on steel Cartridge Cases

المحتوى والصفحات

عدد الصفحات

134

رقم الجزء

0

أبعاد الوثيقة

22 × 30

الموضوعات الرئيسية

العلوم الاجتماعية › العلوم الاقتصادية › الانتاج › الصناعة · العلوم البحتة(الطبيعية) › الكيمياء والعلوم المتصلة بها › الكيمياء التحليلية › التحليل الكهربائى · العلوم البحتة(الطبيعية) › الكيمياء والعلوم المتصلة بها › علم المعادن › الزنك

كلمات مفتاحية

التحليل الكهربائى · الزنك · الصناعة

التصنيف العام

متخصص

إشراف وإعداد

الإشراف

Sosnovsky Y. N, Teodora Ibrahim

جدول المحتويات

introduction
 1
 literature survey
 3
 experimental part
 42
 analysis of results
 93
 safety engineering part
 101
 economical part
 106
 reference
 108
 summary
 112

الاقتباسات الببليوغرافية