Effect of QPQ Treatment on the Microstructure and Properties of Nickel-Aluminum-Bronze Alloy Coating of 27SiMn Alloy Steel

doi:10.12141/j.issn.1000-565X.240239

Abstract

Abstract:

To address the unclear effects of quenching-polishing-quenching (QPQ) treatment on the performance of nickel-aluminum bronze alloy coatings welded onto 27SiMn alloy steel, this study investigated the geometric characteristics, microstructural changes, corrosion resistance, and hardness of the copper alloy coating. The influence of the QPQ treatment process on the coating’s microstructure and properties was analyzed to verify the rationality and feasibility of this composite anti-corrosion technology. The results indicate that after undergoing the two processes of carbonization/nitriding and oxidation, the copper alloy coating forms a dual-layer infiltration structure, with metal carbides distributed across both layers and copper oxides concentrated near the surface, providing corrosion protection. Before and after QPQ treatment, the microstructure of the copper alloy coatings primarily consists of the matrix phase α, the metastable phase, and various κ phases dispersed within the α phase. High-and medium-temperature tempering leads to the precipitation of a large amount of β' phase into the α phase, causing the matrix phase to coalesce and expand while reducing overall hardness. According to the protection rating representation method based on the proportion of substrate area affected by corrosion, the protection rating of the surface of the copper alloy coatings layer samples is 9, while the copper alloy samples after QPQ treatment is 10. The corrosion resistance of the copper alloy surface after QPQ treatment is not only maintained but also exceeds that of the untreated one. In light of this, the composite anti-corrosion technology can be applied to the maintenance and remanufacturing of hydraulic bracket cylinder barrel parts, which can enhance the corrosion resistance of the inner wall of the cylinder barrel as a whole, while also considering the corrosion resistance of other parts such as the joint holes and the outer surface of the cylinder body.

Key words: QPQ processing, surface copper, composite coating, column cylinder, corrosion protection

CLC Number:

TG178

SU Youliang, CUI Hao, GAO Xuenan, ZHENG Haobo. Effect of QPQ Treatment on the Microstructure and Properties of Nickel-Aluminum-Bronze Alloy Coating of 27SiMn Alloy Steel[J]. Journal of South China University of Technology(Natural Science Edition), 2025, 53(3): 105-115.

Figures/Tables 14

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试样	表面形貌		腐蚀情况	保护评级
试样	盐雾试验前	盐雾试验后	腐蚀情况	保护评级
基材试样			第1天开始出现腐蚀，96 h后表面全部腐蚀	0
基材QPQ处理试样			第1天开始出现腐蚀，96 h后表面大面积腐蚀	2
铜合金堆焊层试样			经168 h盐雾实验后，试样表面稍有变色	9
铜合金堆焊层 QPQ处理试样			经168 h盐雾实验后，试样表面未腐蚀，但铜合金QPQ渗层颜色变浅	10

试样名称	试样编号	10次测量的硬度/HV										平均硬度/HV
试样名称	试样编号	1	2	3	4	5	6	7	8	9	10	平均硬度/HV
铜合金	1	203.2	178.2	188.8	164.4	198.4	195.7	206.0	191.3	171.1	165.8	186.3
	2	176.9	177.2	170.6	180.5	188.2	163.9	198.4	185.3	167.1	205.4	181.4
	3	188.2	171.6	214.4	214.5	215.9	194.5	189.7	185.2	190.1	215.3	197.9
铜合金 QPQ处理	4	178.2	162.5	190.6	163.9	175.0	151.6	159.1	163.4	167.9	155.7	166.8
	5	186.9	184.0	133.9	141.6	199.7	175.5	185.7	200.8	175.3	164.9	174.8
	6	159.6	195.7	172.9	167.9	179.9	157.1	165.9	148.6	169.1	177.6	169.4

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