Wpływ obróbki cieplnej na strukturę i właściwości galwanicznych powłok Zn-Ni-P

• Autorzy: Budniok A. , Bierska-Piech B. , Karolus M. , Łągiewka E. , Niedbała J.

Warianty tytułu

EN

The influence of the thermal treatment on the structure and properties the galvanic Zn-Ni-P coatings

• Języki publikacji: PL

Abstrakty

PL

Przeprowadzone badania miały na celu zmniejszenie efektu anomalnego osadzania cynku w obecności niklu poprzez zmianę mechanizmu współosadzania jonów tych metali. Opracowano warunki otrzymywania powłok Zn-Ni-P na podłożu stalowym (OH18N9). Stopy Zn-Ni-P otrzymywano z kąpieli amoniakalnej z dodatkiem podfosforynu sodowego. Proces prowadzono galwanostatycznie stosując warunki prądowe wybrane na podstawie analizy procesu osadzania w celce Hulla. Stwierdzono, że dla kąpieli amoniakalnej optymalny zakres gęstość prądu osadzania powłok wynosi 2-15 mA x cm-2. Dla otrzymanych w tych warunkach powłok Zn-Ni-P określono skład fazowy i chemiczny oraz przeprowadzono badania morfologii powierzchni z wykorzystaniem mikroskopu skaningowego. W zakresie gęstości prądowej 5-12,5 mA x cm-2 skład chemiczny powłok mało zależy od warunków prądowych ich otrzymywania (31 % Ni, 61 % Zn i 8 % P). Obróbkę cieplną powłok przeprowadzono w temperaturze 320 stopni Celsjusza przez 2 godziny w atmosferze gazu ochronnego (argonu). Obróbka cieplna powłok spowodowała krystalizację roztworu stałego na osnowie niklu i zmniejszenie w nim zawartości cynku oraz powstanie fazy gamma Ni5Zn21 odpowiedzialnej za dobre właściwości odporności korozyjnej. Dla powłok po obróbce cieplnej stwierdzono wzrost wielkości krystalitów i mikrotwardości powierzchni.

EN

Research has sought to reduce the effect of zinc anomaly deposition in the presence of nickel by changing the mechanism of metal ions co-deposition. Zn-Ni-P coatings were deposited on surface of steel (OH18N9). The Zn-Ni-P coatings obtained from the ammonia bath with the sodium hypophosphite addition. The process was carried out using the galvanostatic conditions selected on the basis of an analysis of the deposition process in the Hull's cell. It was found that for ammonia baths the optimum range of deposition current density Zn-Ni-P coatings is 2-15 mA x cm-2. For obtained in these conditions Zn-Ni-P coatings defined phases and chemical composition. Surface morphology studies were performed using a scanning microscope. In range of the current density 5-12,5 mA x cm-2 the chemical composition of the Zn-Ni-P coatings not depend on the current conditions (31 % Ni, 61 % Zn, and 8 % P) and their micro-hardness falls within the range of 520-560 HV. These Zn-Ni-P coatings are characterized by multi-phase structure, containing a separate phases of zinc, the solid solution Zn in Ni (capacity the crystallite of the order of nm) and there is no great amount of zinc oxide. The coatings have therefore nanocrystalline structure, and in the metastable solution of zinc in nickel is about 16 % Zn. The thermal treatment of the Zn-Ni-P coatings was carried out in a temperature 320 degrees of Celsius for 2 hours in an protective gas atmosphere (argon). Thermal treatment Zn-Ni-P caused a crystallization of a solid solution on the nickel matrix, reduction the zinc content in the solid solution and formation of the phase gamma Ni5Zn21, responsible for the good properties of corrosion-resistance. The size of type II stresses has decreased about six times, and a in a solid solution remains constant a round 3 % zinc. In this way, electrochemical activity Zn-Ni-P coatings was reduced, which has importance for improving the corrosion-resistance coatings. For the Zn-Ni-P coating after thermal treatment increased the size of crystallite and micro-hardness of the surface. Microhardness of the Zn-Ni-P coatings after thermal treatment is also an increase to around 630-690 HV and increases about fifteen times in the volume of crystallite.

Słowa kluczowe

PL

cynk; nikiel; powłoki galwaniczne; elektroosadzanie; obróbka cieplna

EN

zinc; nickel; galvanic coatings; electrodeposition; thermal treatment

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Rudy i Metale Nieżelazne
• Rocznik: 2009
• Tom: R. 54, nr 3
• Strony: 137--142
• Opis fizyczny: Bibliogr. 26 poz., rys., tab., wykr.

Twórcy

autor

Budniok A.

autor

Bierska-Piech B.

autor

Karolus M.

autor

Łągiewka E.

autor

Niedbała J.

• Uniwersytet Śląski, Instytut Nauki o Materiałach, Katowice

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