SU1458770A1 - Method of quantitative analysis of porosity of electroplated coating - Google Patents

Method of quantitative analysis of porosity of electroplated coating Download PDF

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Publication number
SU1458770A1
SU1458770A1 SU874276541A SU4276541A SU1458770A1 SU 1458770 A1 SU1458770 A1 SU 1458770A1 SU 874276541 A SU874276541 A SU 874276541A SU 4276541 A SU4276541 A SU 4276541A SU 1458770 A1 SU1458770 A1 SU 1458770A1
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SU
USSR - Soviet Union
Prior art keywords
porosity
coating
polarization
quantitative analysis
electroplated coating
Prior art date
Application number
SU874276541A
Other languages
Russian (ru)
Inventor
Tamara M Ovchinnikova
Valentina M Timonyuk
Galina S Dolgoborodova
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Kirovsk Polt Inst
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Priority to SU874276541A priority Critical patent/SU1458770A1/en
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Publication of SU1458770A1 publication Critical patent/SU1458770A1/en

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Description

Изобретение относится к области контроля качества гальванических покрытий. Цель изобретения - обеспечение возможности определения пористости кадмиевого покрытия на стали. Анализируемый образец поляризуют при потенциалах от 0,1 до 0,2 В относительно водородного потенциала в растворе, содержащем от 368 до 386 г/л моногидрата оксалата калия и от 18 до 27 г/л хлористого водорода. Ток поляризации измеряют через 2-3 мин после начала поляризации. 2 табл.The invention relates to the field of quality control electroplating. The purpose of the invention is the provision of the possibility of determining the porosity of the cadmium coating on steel. The analyzed sample is polarized at potentials from 0.1 to 0.2 V relative to the hydrogen potential in a solution containing from 368 to 386 g / l of potassium oxalate monohydrate and from 18 to 27 g / l of hydrogen chloride. The polarization current is measured 2-3 minutes after the start of polarization. 2 tab.

При тех же потенциалах поляризации была определена пористость кадмиевых покрытий (5, %) толщиной 10 мкм.At the same polarization potentials, the porosity of cadmium coatings (5%) with a thickness of 10 μm was determined.

Пористость рассчитывалась по форPorosity was calculated by odds

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ГДе ^Бр C D E * Br

плотность тока, проходящего через исследуемый образец при заданных условиях поляризации, мА/см2.current density passing through the sample under given polarization conditions, mA / cm 2 .

За величину пористости здесь и далее принимался результат статисти· ческой обработки данных 5-8 параллельных определений.Hereinafter, the result of statistical data processing of 5–8 parallel determinations was taken as the value of porosity.

Полученные результаты приведены в табл. 1 (величина потенциалов Е.The results are shown in Table. 1 (the value of the potentials E.

811 „„ 1458770 А1811 „1458770 A1

33

(здесь и далее) дана относительно нормального водородного электрода)(hereinafter) is given relative to the normal hydrogen electrode)

14587701458770

высокой точностью, чем метод окрашивания.high precision than the staining method.

Определена пористость кадмиевых покрытий различной толщины настоящим способом и методом окрашивания. Определение пористости электрохимическим методом проводилось в растворе состава, г/л: К2С704’Н20 377, НС1 22,7; при потенциале +0,1 В. Измерение тока проводилось через 2,5 мин после подачи потенциала на исследуемый образец.The porosity of cadmium coatings of various thickness is determined by the present method and the staining method. Determination of porosity by the electrochemical method was carried out in a solution of the composition, g / l: K 2 C 7 04'H 2 0 377, HC1 22.7; at a potential of +0.1 V. The current was measured in 2.5 minutes after applying the potential to the sample under study.

Результаты приведены в табл. 2.The results are shown in Table. 2

Время, затраченное на получение результатов методом окрашивания, 8 ч.The time spent on obtaining results by the staining method, 8 hours

Таблица показывает, что пористость кадмиевого покрытия снижается с увеличением его толщины.The table shows that the porosity of the cadmium coating decreases with increasing thickness.

Предлагаемый метод позволяет определить величину пористости с болееThe proposed method allows to determine the value of porosity with more

Claims (1)

Формула изобретенияClaim 10ten 1515 2020 Способ количественного определения пористости гальванического покрытия путем анодной поляризации и измерения установившегося значения тока, отличающийся тем, что, с целью обеспечения возможности определения пористости кадмиеврго покрытия на стали, анодную поляризацию проводят в интервале потенциалов 0,10-0,20 В относительно нормального водородного электрода в водном растворе, содержащем 368-386 г/л моногидрата оксалата калия и 18-27 г/л хлористого водорода, причем ток измеряют через интервал времени 2-3 мин после начала поляризации.The method of quantitative determination of electroplated coating porosity by anodic polarization and measurement of the steady-state current value, characterized in that, in order to enable determination of the porosity of a cadmium coating on steel, anodic polarization is carried out in the potential range of 0.10-0.20 V relative to the normal hydrogen electrode in an aqueous solution containing 368-386 g / l potassium oxalate monohydrate and 18-27 g / l hydrogen chloride, the current being measured at a time interval of 2-3 minutes after the start of polarization. Таблица!Table! Е, В E, B 1ст * 2 мА/см 1st * 2 mA / cm 2 мА/см 2 mA / cm п, % P, % мА/см mA / cm 8, % eight, % 0 0 54 54 2 2 3,7 3.7 2,0 2.0 0 0 +0,10 +0.10 80 80 2 2 2,5 2.5 4,4 4.4 3,010,5 3,010,5 +0,15 +0.15 81 81 2 2 2,5 2.5 4,4' 4,4 ' 3,0+0,5 3.0 + 0.5 +0,20 +0.20 83 83 2 2 2,4 2.4 4,5 4.5 3,0+0,5 3.0 + 0.5 +0,30 +0.30 85 85 3 3 3,5 3.5 2,5 2.5 0 0 Т а T a блиц blitz а 2 a 2
Толщина покрытия, мкмCoating thickness, micron Пористость, %Porosity,% Предлагаемый способThe proposed method Метод окрашиванияStaining method 1,0 1.0 31+2,5 31 + 2.5 32±5 32 ± 5 1,5 1.5 11+2,5 11 + 2.5 10±5 10 ± 5 2,0 2.0 0 0 0 0
SU874276541A 1987-07-06 1987-07-06 Method of quantitative analysis of porosity of electroplated coating SU1458770A1 (en)

Priority Applications (1)

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SU874276541A SU1458770A1 (en) 1987-07-06 1987-07-06 Method of quantitative analysis of porosity of electroplated coating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU874276541A SU1458770A1 (en) 1987-07-06 1987-07-06 Method of quantitative analysis of porosity of electroplated coating

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SU1458770A1 true SU1458770A1 (en) 1989-02-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111272624A (en) * 2019-11-29 2020-06-12 中国商用飞机有限责任公司 Porosity detection method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111272624A (en) * 2019-11-29 2020-06-12 中国商用飞机有限责任公司 Porosity detection method

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