Wettability and Salt Spray Corrosion Resistance of Magnesium Alloys Treated with Laser Surface Texturing

Fig. 3. Surface SEM morphologies and static contact angle of specimens with different wettability states.（a）0^# original specimen；（b）1^# hydrophilic specimen；（c）2^# hydrophobic specimen；（d）3^# Wenzel specimen；（e）4^#Cassie specimen

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Fig. 4. Surface topography of specimen after corrosion

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Fig. 5. SEM surface morphologies of 0^# original specimen before and after corrosion. (a) Before corrosion; (b) after corrosion (30 h)

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Fig. 6. Cross-sectional morphologies of specimen after 30 h corrosion. (a) 0^#original specimen; (b) 1^#hydrophilic specimen; (c) 2^# hydrophobic specimen; (d) 3^#Wenzel specimen; (e) 4^#Cassie specimen

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Fig. 7. Diagram of microelectric couples corrosion mechanism

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Fig. 8. Three-dimensional morphologies of specimens surface and section height. (a) 0^#original specimen; (b) 1^#hydrophilic specimen;(c) 2^#hydrophobic specimen; (d) 3^#Wenzel specimen; (e) 4^#Cassie specimen

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Fig. 9. Corrosion layer thickness of different wettability specimens

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Table 1. Salt spray corrosion parameter standard
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Table 1. Salt spray corrosion parameter standard
Parameter Content
Temperature /℃ 35
Ingredient NaCl
Mass fraction /% 5
pH 6.5-7.2
Placement angle /（°） 30
Salt spray sedimentation rate per 80 cm² area /（mL·h^-1） 1.5

Table 2. Laser process parameters and contact angles
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Table 2. Laser process parameters and contact angles
No. Power /W Spacing /μm Velocity /（mm·s^-1） Contact angle /（°） Sliding angle /（°）
0^# 48.84
1^# 9 50 1800 85.06
2^# 16 100 1000 113.69
3^# 9 100 1200 151.19
4^# 9 50 800 153.33 3.51

Table 3. Surface composition of AZ91D magnesium alloy before and after heat treatment

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Table 3. Surface composition of AZ91D magnesium alloy before and after heat treatment

Specimen	Elemental mass fraction /%
Specimen	C	O	Mg	Al
3^#，before heat treatment	5.94	7.26	78.49	7.73
3^#，after heat treatment	12.01	8.31	76.82	7.11
4^#，before heat treatment	5.71	9.56	77.00	6.85
4^#，after heat treatment	14.72	11.56	68.34	6.05

Table 4. Comparison of elemental composition before and after corrosion of 0^# original specimen
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Table 4. Comparison of elemental composition before and after corrosion of 0^# original specimen
Position in Fig.5 Elemental mass fraction /%
O Mg Al Fe
A 1.02 86.57 7.57 0.11
B 34.72 21.28 0.44 0.04
C 12.88 77.04 2.76 0.09

Table 5. Comparison of elemental composition of 0^# original and 1^# hydrophilic specimens before corrosion
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Table 5. Comparison of elemental composition of 0^# original and 1^# hydrophilic specimens before corrosion
Specimen Elemental mass fraction /%
O Mg Al Fe
0^# original specimen 1.02 86.57 7.57 0.11
1^# hydrophilic specimen 17.48 74.13 4.06 0.22

Table 6. Comparison of elemental composition of 0^# original and 1^# hydrophilic specimens after 20 h corrosion
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Table 6. Comparison of elemental composition of 0^# original and 1^# hydrophilic specimens after 20 h corrosion
Specimen Elemental mass fraction /%
O Mg Al Fe
0^# original specimen 31.43 28.55 3.26 0.03
1^# hydrophilic specimen 28.45 31.23 1.88 0.02

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Yu Ji, Yunxia Ye, Jiasheng Guo, Xudong Ren. Wettability and Salt Spray Corrosion Resistance of Magnesium Alloys Treated with Laser Surface Texturing[J]. Chinese Journal of Lasers, 2023, 50(16): 1602205

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Paper Information

Category: Laser Surface Machining

Received: Oct. 5, 2022

Accepted: Nov. 15, 2022

Published Online: Jul. 31, 2023

The Author Email: Ye Yunxia (yeyunxia@mail.ujs.edu.cn)

DOI:10.3788/CJL221295

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Salt spray corrosion parameter standard

Table 1. Salt spray corrosion parameter standard

Table 2. Laser process parameters and contact angles

Table 2. Laser process parameters and contact angles

Table 3. Surface composition of AZ91D magnesium alloy before and after heat treatment

Table 3. Surface composition of AZ91D magnesium alloy before and after heat treatment

Table 4. Comparison of elemental composition before and after corrosion of 0# original specimen

Table 4. Comparison of elemental composition before and after corrosion of 0# original specimen

Table 5. Comparison of elemental composition of 0# original and 1# hydrophilic specimens before corrosion

Table 5. Comparison of elemental composition of 0# original and 1# hydrophilic specimens before corrosion

Table 6. Comparison of elemental composition of 0# original and 1# hydrophilic specimens after 20 h corrosion

Table 6. Comparison of elemental composition of 0# original and 1# hydrophilic specimens after 20 h corrosion

Table 4. Comparison of elemental composition before and after corrosion of 0^# original specimen

Table 4. Comparison of elemental composition before and after corrosion of 0^# original specimen

Table 5. Comparison of elemental composition of 0^# original and 1^# hydrophilic specimens before corrosion

Table 5. Comparison of elemental composition of 0^# original and 1^# hydrophilic specimens before corrosion

Table 6. Comparison of elemental composition of 0^# original and 1^# hydrophilic specimens after 20 h corrosion

Table 6. Comparison of elemental composition of 0^# original and 1^# hydrophilic specimens after 20 h corrosion