论文总字数：24440字

摘 要

腐蚀是现代工业和生活中的重要破坏因素，化工行业造成设备腐蚀的主要介质是工艺水及循环水。缓蚀剂作为一种简洁方便，见效较快，成本较低的金属腐蚀防护方法已经被广泛应用。本文以钼酸钠作为主要缓蚀剂与其他药品进行复配来研究碳钢在模拟海水（3.5%Nacl溶液）中的腐蚀情况。应用失重法和电化学法进行腐蚀研究，得出以下结论：

以单组份钼酸钠在常温常压条件下进行试验，当钼酸钠浓度为1200mg/L时，其腐蚀速率明显减小，为0.12mm/a，缓蚀效率达到86.5%，当其浓度达到1600mg/L时，腐蚀速率为0.08mm/a，缓蚀效率达到88.7%，其增幅较小，故本文选取钼酸钠最佳浓度为1200mg/L，并以此浓度为复配浓度；以单组份甲硫氨酸在常温常压条件下进行试验，当甲硫氨酸浓度为150mg/L时，其腐蚀速率明显减小，为0.21mm/a，缓蚀效率达到74.1%，当其浓度继续增加，缓蚀效率逐渐降低，故在单独使用甲硫氨酸的浓度为150mg/L。对这两种缓蚀剂进行复配进行试验后发现，当ρ(钼酸钠):ρ(甲硫氨酸)=2:3时，缓蚀剂的缓蚀效率最高，达到了92.5%，有效减少了钼酸钠的使用量，同时提高了钼酸钠的缓蚀效率。

关键词：钼酸钠 缓蚀剂 腐蚀速率 碳钢

Corrosion Inhibition of sodium molybdate and its mixture with carbon steel in seawater

ABSTRACT

Corrosion is a modern industrial and Life disruptive factor, the chemical industry is mainly caused by corrosion of equipment and process water circulating medium is water. Inhibitor as a simple and convenient, effective and rapid, low-cost metal corrosion protection method has been widely used. In this paper, as the main inhibitor of sodium molybdate and other drugs can be complex to study the steel in simulated sea water (3.5% Nacl solution) corrosion. For application weight loss and electrochemical corrosion studies, the following conclusions:

In one component of sodium molybdate tested under normal temperature and pressure conditions, when the concentration of sodium molybdate 1200mg / L, the corrosion rate is significantly reduced, as 0.12mm / a, inhibition efficiency reached 86.5%, when the concentration reaching 1600mg / L, the corrosion rate of 0.08mm / a, inhibition efficiency reached 88.7%, its growth rate is small, therefore we choose the optimum concentration of sodium molybdate 1200mg / L, and thus the concentration of compound concentration; to One component methionine tested under normal temperature and pressure conditions, when the methionine concentration 150mg / L, the corrosion rate is significantly reduced, as 0.21mm / a, inhibition efficiency reached 74.1%, while its concentration continues to increase, the inhibition efficiency decreases, so the concentration of methionine alone was 150mg / L. After these two inhibitors can be complex test found that when ρ (molybdate sodium): ρ (methionine) = 2: 3, corrosion inhibition efficiency of the highest, reaching 92.5% effectively reducing the amount of sodium molybdate, while improving the inhibition efficiency of sodium molybdate.

Keywords: Sodium molybdate； Inhibitor； Corrosion rate ；Carbon steel

目 录

摘 要 I

ABSTRACT II

第一章 绪 论 1

1.1引 言 1

1.2缓蚀剂概述..............................................................................................................................1

1.3缓蚀剂分类..............................................................................................................2

1.3.1 按化学组成分类 2

1.3.2 按对电极影响过程分类 2

1.3.3 按在金属表面形成保护膜特征分类 3

1.4缓蚀剂的选用方法..................................................................................................3

1.4.1 保护材料 ....................................................................................................3

1.4.2 腐蚀介质 4

1.4.3 用量及复配 4

1.5海水缓蚀剂的研究进展..........................................................................................4

1.6缓蚀剂的试验研究方法..........................................................................................6

1.6.1 失重法..........................................................................................................6

1.6.2 电化学法......................................................................................................7

1.7本课题研究背景，内容及目的..............................................................................7

第二章 实验方法 9

2.1实验仪器及设备 9

2.2实验材料及试剂 9

2.2.1 实验材料 9

2.2.2 实验试剂 9

2.3试验方法 10

2.3.1 失重法........................................................................................................10

2.3.2 电化学测试 11

第三章 单组份缓蚀剂研究 13

3.1钼酸钠浓度对20^#钢在模拟海水中腐蚀行为的影响...........................................13

3.1.1 失重腐蚀试验结果.....................................................................................13

3.1.2 极化曲线测试结果.....................................................................................14

3.2甲硫氨酸浓度对20^#钢在模拟海水中腐蚀行为的影响.......................................16

3.2.1 失重腐蚀试验结果.....................................................................................16

3.2.2 极化曲线测试结果 .17

第四章 复配缓蚀剂实验 19

4.1实验数据结果 19

第五章 结论 21

5.1结论 21

参考文献 22

致 谢 24

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