Evaluations of corrosion resistance of 16 MnCr5 steel/DLC coatings with various CH4/Ar ratio in two saline environments

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-05-03 DOI:10.1016/j.diamond.2025.112404

Mobin Dizisaz , Mahboobeh Azadi , Amirhossein Hafazeh , Mohammad Azadi , Mohammad Sadegh Agharebparast

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Abstract

This study examines the corrosion behavior of diamond-like carbon (DLC) coatings applied to plasma-nitride 16MnCr5 steel in two saline environments. Two distinct DLC coatings were created with varying CH₄/Ar ratios using the plasma-enhanced chemical vapor deposition technique. The properties of the DLC coatings were assessed through electrochemical testing, Raman spectrometry, X-ray diffraction, and field emission scanning electron microscopy (FESEM). Following a 24-h exposure to a 3.5 wt% NaCl solution, the corrosion rate of the DLC coating, which was about 6 μm thick and had a high CH₄/Ar ratio of 1.5, decreased by 88 % in comparison to the steel substrate. However, a DLC coating with a thinner profile and a lower CH₄/Ar ratio demonstrated superior corrosion resistance in Ringer's solution after 1 h. The corrosion impedance for both coatings in the saline medium increased by 62–79 % relative to the steel substrate. FESEM imaging revealed that the corroded DLC coatings exhibited small pits, while the steel surface displayed larger pores and cracks when exposed to the saline solutions.

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不同CH4/Ar比的16mncr5钢/DLC涂层在两种盐水环境中的耐蚀性评价

本研究考察了类金刚石（DLC）涂层在等离子氮化16MnCr5钢上在两种盐水环境中的腐蚀行为。采用等离子体增强化学气相沉积技术，制备了两种不同的CH4/Ar比的DLC涂层。通过电化学测试、拉曼光谱、x射线衍射和场发射扫描电镜（FESEM）对DLC涂层的性能进行了评价。在3.5 wt% NaCl溶液中浸泡24小时后，厚度约为6 μm、CH4/Ar比高达1.5的DLC涂层的腐蚀速率比钢基体降低了88%。然而，具有较薄轮廓和较低CH4/Ar比的DLC涂层在1小时后在林格溶液中表现出更好的耐腐蚀性。两种涂层在盐水介质中的腐蚀阻抗相对于钢基体增加了62 - 79%。FESEM成像显示，腐蚀后的DLC涂层呈现出小凹坑，而钢表面在盐溶液中呈现出较大的孔隙和裂纹。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.