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Pulsed galvanostatic electrolysis modes for enhancing corrosion resistance of eco-friendly tin-zinc alloy coatings
https://doi.org/10.22349/1994-6716-2025-123-3-97-107
Abstract
The influence of pulsed galvanostatic electrolysis modes (unipolar and reverse) on the corrosion resistance and functional properties of eco-friendly tin-zinc (Sn–Zn) alloy coatings was investigated. An alkaline solution with sodium citrate and sodium lauryl sulfate additives was used as the electrolyte. The unipolar mode (5 ms, 1.5 A/dm²) provided high current efficiency (72%) and microhardness (950–1050 MPa) but increased porosity (7–12%). The reverse mode (5 ms cathodic/anodic phases, 2.0/0,5 A/dm²) demonstrated minimal porosity (2–4%), reduced internal stresses (50–80 MPa), and maximum corrosion resistance (>1200 hours in salt spray). It was established that the anodic phases of the reverse mode level the surface, reducing defects. Pulsed technologies have surpassed stationary electrolysis in wear resistance (2–3 times), microhardness (+15–25%), and solderability (wetting angle 12–18°). The reverse mode is recommended for marine electronics and aviation, while the unipolar mode is suitable for tasks prioritizing microhardness. The results contribute to the development of eco-friendly alternatives to toxic coatings in compliance with RoHS/REACH directives.
About the Authors
S. Yu. Kireev
Penza State University
Russian Federation
Russian Federation
Dr Sc.
40 Krasnaya St, 440026, Penza
G. V. Kozlov
Penza State University
Russian Federation
Russian Federation
Dr Sc.
40 Krasnaya St, 440026, Penza
S. N. Kireeva
Penza State University
Russian Federation
Russian Federation
Cand Sc.
40 Krasnaya St, 440026, Penza
A. Z. Yangurazova
Penza State University
Russian Federation
Russian Federation
40 Krasnaya St, 440026, Penza
Yu. N. Kirilina
Penza State University
Russian Federation
Russian Federation
Cand Sc.
40 Krasnaya St, 440026, Penza
A. S. Balyberdin
Penza State University
Russian Federation
Russian Federation
40 Krasnaya St, 440026, Penza
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Review
For citations:
Kireev S.Yu., Kozlov G.V., Kireeva S.N., Yangurazova A.Z., Kirilina Yu.N., Balyberdin A.S. Pulsed galvanostatic electrolysis modes for enhancing corrosion resistance of eco-friendly tin-zinc alloy coatings. Voprosy Materialovedeniya. 2025;(3(123)):97-107. (In Russ.) https://doi.org/10.22349/1994-6716-2025-123-3-97-107
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