Amorphous NiP and NiCrP alloy coatings were prepared on copper substrates by electrodeposition. The thermal stability of the obtained coatings were evaluated by the onset temperature of phase transformation identified with differential scanning calorimetry measurements, and their high temperature oxidation resistances were characterized by the oxidation kinetics curve and the oxidation activation energy. The mechanism of the doping effect of Cr element on crystallization temperature and oxidation resistance of the alloy coatings were discussed based on X-ray diffraction analysis. The results show that the crystallization temperature of NiP amorphous alloy was $$344^{\circ }\hbox {C}$$ 344 ∘ C , and the oxidation activation energy was calculated to be $$1.54 \times 10^{\mathrm {3}}\hbox { J mol}^{\mathrm {-1}}$$ 1.54 × 10 3 J mol - 1 . As for NiCrP alloy coating with a Cr content of 1.8 wt%, the crystallization temperature increased to $$403.8^{\circ }\hbox {C}$$ 403 . 8 ∘ C and the calculated oxidation activation energy was $$3.53 \times 10^{\mathrm {4}}\hbox { J mol}^{\mathrm {-1}}$$ 3.53 × 10 4 J mol - 1 , 2.29 times higher than the NiP coating. The remarkably enhanced high-temperature oxidation resistance of NiCrP alloy coating can be attributed to the compact metal oxide film formed on the surface.

中文翻译：

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提高电沉积 NiCrP 非晶合金涂层的热稳定性和抗氧化性

通过电沉积在铜基体上制备了非晶NiP和NiCrP合金涂层。所得涂层的热稳定性通过差示扫描量热法测量确定的相变起始温度进行评估，其高温抗氧化性通过氧化动力学曲线和氧化活化能来表征。基于X射线衍射分析，探讨了Cr元素掺杂对合金镀层结晶温度和抗氧化性的影响机理。结果表明，NiP非晶合金的结晶温度为$$344^{\circ }\hbox {C}$$ 344 ∘ C ，计算氧化活化能为$$1.54 \times 10^{\mathrm {3 }}\hbox { J mol}^{\mathrm {-1}}$$ 1.54 × 10 3 J mol - 1 . 对于 Cr 含量为 1.8 wt% 的 NiCrP 合金涂层，结晶温度增加到 $$403.8^{\circ}\hbox {C}$$$403 。8 ∘ C 和计算的氧化活化能为 $$3.53 \times 10^{\mathrm {4}}\hbox { J mol}^{\mathrm {-1}}$$ 3.53 × 10 4 J mol - 1 , 2.29比 NiP 涂层高出数倍。NiCrP合金涂层显着增强的高温抗氧化性可归因于表面形成致密的金属氧化膜。